{"id":2823,"date":"2023-01-12T14:41:58","date_gmt":"2023-01-12T12:41:58","guid":{"rendered":"https:\/\/geopostcodes.pdgm.fr\/?p=2823"},"modified":"2026-04-01T07:01:01","modified_gmt":"2026-04-01T07:01:01","slug":"zip-code-time-zone-database","status":"publish","type":"post","link":"https:\/\/www.geopostcodes.com\/en-GB\/blog\/postcode-time-zone-database\/","title":{"rendered":"How to Build a Postcode to Time Zone Database in 5 Steps"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Key Takeaways<\/h2>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Postcode to time zone mapping enables timely customer communication<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Database creation requires postcode and time zone data integration<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Geographic matching links codes to time zones based on coordinates<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Commercial databases offer better accuracy and regular updates<\/li>\n<\/ul>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction<\/h2>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>Timing matters when it comes to contacting customers. It increases the engagement and response. However, determining the right time for a large base of customers spread across different zones is challenging, especially in countries like the <a href=\"https:\/\/www.geopostcodes.com\/en-GB\/country\/united-states\/postcode\/\" target=\"_blank\" rel=\"noreferrer noopener\">USA<\/a>, <a href=\"https:\/\/www.geopostcodes.com\/en-GB\/country\/canada\/postcode\/\" target=\"_blank\" rel=\"noreferrer noopener\">Canada<\/a>, <a href=\"https:\/\/www.geopostcodes.com\/en-GB\/country\/mexico\/postcode\/\" target=\"_blank\" rel=\"noreferrer noopener\">Mexico,&nbsp;<\/a><a href=\"https:\/\/www.geopostcodes.com\/en-GB\/country\/brazil\/postcode\/\" target=\"_blank\" rel=\"noreferrer noopener\">Brazil<\/a>, and <a href=\"https:\/\/www.geopostcodes.com\/en-GB\/country\/russia\/postcode\/\" target=\"_blank\" rel=\"noreferrer noopener\">Russia<\/a>, which span multiple time zones.<\/p>\n\n\n\n<p>In this article, we&#8217;ll infer time zones from international postcodes. <a href=\"https:\/\/www.geopostcodes.com\/en-GB\/blog\/international-zip-code-format\/\" target=\"_blank\" rel=\"noreferrer noopener\">Postcodes<\/a> (also known as <a href=\"https:\/\/www.geopostcodes.com\/en-GB\/blog\/what-is-a-postal-code\/\" target=\"_blank\" rel=\"noreferrer noopener\">postal codes<\/a> or postcodes) are an element of standard&nbsp;<a href=\"https:\/\/www.geopostcodes.com\/en-GB\/blog\/international-address-data\/\" target=\"_blank\" rel=\"noreferrer noopener\">address formatting<\/a>. Since they are part of user information, <a href=\"https:\/\/www.geopostcodes.com\/en-GB\/blog\/what-is-a-postcode\/\" target=\"_blank\" rel=\"noreferrer noopener\">postcodes<\/a> are often used to determine time zones.<\/p>\n\n\n\n<style>\n    #containerIframe {\n        overflow-y: hidden;\n        margin-bottom: 0;\n    }\n    #iframe {\n        transition: height 200ms ease-in;\n        overflow-y: hidden;\n        width: 100%;\n    }\n    .zip-looker-container {\n        display: flex;\n        flex-direction: column;\n        align-items: stretch;\n        justify-content: center;\n        background-color: #d7efff;\n        margin: 40px 0 0 0;\n        padding: 40px 20px 0px 20px;\n        border-radius: 12px 12px 0 0;\n    }\n    .zip-looker-container > * {\n        margin-bottom: 10px;\n    }\n    .zip-looker-container h3, .zip-looker-container p {\n        margin: 0 0 25px 0;\n        text-align: center;\n    }\n.zip-looker-container h3 {\n    margin-bottom: 10px;\n}\n    .zip-looker-container p {\n        font-size: 14px;\n    }\n    .zip-looker-icon {\n        display: flex;\n        justify-content: center;\n        align-items: center;\n        margin: auto auto 10px auto;\n        width: 50px;\n        height: 50px;\n        background-color: #C42990;\n        border-radius: 12px;\n    }\n    <\/style>\n    <div class=\"zip-looker-container\">\n        <div class=\"zip-looker-icon\">\n            <svg width=\"25\" height=\"25\" viewBox=\"0 0 25 25\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                <g clip-path=\"url(#clip0_81_26)\">\n                    <path d=\"M23.75 23.75L18.3213 18.3213M18.3213 18.3213C19.2499 17.3927 19.9865 16.2902 20.489 15.0769C20.9916 13.8637 21.2503 12.5633 21.2503 11.25C21.2503 9.93676 20.9916 8.63637 20.489 7.42308C19.9865 6.20979 19.2499 5.10737 18.3213 4.17876C17.3927 3.25015 16.2902 2.51354 15.0769 2.01098C13.8637 1.50842 12.5633 1.24976 11.25 1.24976C9.93676 1.24976 8.63637 1.50842 7.42308 2.01098C6.20979 2.51354 5.10737 3.25015 4.17876 4.17876C2.30335 6.05418 1.24976 8.59778 1.24976 11.25C1.24976 13.9022 2.30335 16.4459 4.17876 18.3213C6.05418 20.2025 8.59778 21.2503 11.25 21.2503C13.9022 21.2503 16.4459 20.2025 18.3213 18.3213Z\" stroke=\"white\" stroke-width=\"1.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\/>\n                <\/g>\n                <defs>\n                    <clipPath id=\"clip0_81_26\">\n                        <rect width=\"25\" height=\"25\" fill=\"white\"\/>\n                    <\/clipPath>\n                <\/defs>\n            <\/svg>\n        <\/div>\n        <h3>Try Our Postcode Lookup Tool<\/h3>\n        <p>Enter any Postcode in the USA<\/p>\n        <div id=\"containerIframe\" >\n            <iframe id=\"iframe\" data-hj-allow-iframe src=\"https:\/\/iframes.geopostcodes.com\/zip-code-lookup?style=dark\" title=\"Zip Code Lookup\">\n            <\/iframe>\n        <\/div>\n    <\/div>\n    <script type=\"text\/javascript\">\n    \/\/ parent.js (running on the parent page)\n            const iframe = document.getElementById('iframe');\n    \n    window.addEventListener('message', function (event) {\n    switch(event.data.type) {\n        case 'resize': {\n            if (event.data  && event.data.height) {\n            iframe.style.height = event.data.height + 20 + 'px';\n        }\n            break;\n        }\n        case 'redirect': {\n            if(event.data && event.data.url) {\n                window.location.href = event.data.url;\n            }\n        }\n    }\n    });\n    <\/script>\n\n\n\n<div class=\"wp-block-group ticss-5032fa99 is-vertical is-content-justification-stretch is-layout-flex wp-container-core-group-is-layout-d675b50f wp-block-group-is-layout-flex\" style=\"margin-bottom:40px;padding-top:20px;padding-right:30px;padding-bottom:40px;padding-left:30px\">\n<h3 class=\"wp-block-heading has-text-align-center ticss-fc347abd\">Need International Coverage?<\/h3>\n\n\n\n<p class=\"has-text-align-center\" style=\"font-size:14px\">Get access to location data from 247 countries.<\/p>\n\n\n\n<div class=\"wp-block-group ticss-168007d4 is-content-justification-center is-layout-flex wp-container-core-group-is-layout-66a5e67e wp-block-group-is-layout-flex\" style=\"margin-top:20px;margin-bottom:0px;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px\"><a class=\"cta dark-2 xl\" target=\"_self\" href=\"#elementor-action%3Aaction%3Dpopup%3Aopen%26settings%3DeyJpZCI6IjMyMDI2IiwidG9nZ2xlIjpmYWxzZX0%3D\" type=\"button\"><span class=\"cta-text\">Request Sample Dataset<\/span><\/a>\n\n\n<a class=\"cta transparent xl\" target=\"_self\" href=\"\/en-GB\/pricing\" type=\"button\"><span class=\"cta-text\">Request Pricing<\/span><\/a>\n<\/div>\n<\/div>\n\n\n\n<div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"what-is-zip-code-to-time-zone-mapping-\">What Is Time Zone By Postcode Mapping?<\/h2>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>It is a process of associating a time zone to each postal code of a dataset. This requires access to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Postcodes with additional information (administrative divisions, coordinates, etc.)<\/li>\n\n\n\n<li>Time zone rules<\/li>\n<\/ul>\n\n\n\n<p><a href=\"https:\/\/www.geopostcodes.com\/en-GB\/blog\/comparing-postcode-mapping-tools\/\" target=\"_blank\" rel=\"noreferrer noopener\">Mapping postcodes<\/a><a href=\"https:\/\/www.geopostcodes.com\/en-GB\/blog\/comparing-postcode-mapping-tools\/\" target=\"_blank\" rel=\"noreferrer noopener\"> <\/a>to time zones can be complex, especially in the USA, where states, counties, or even smaller regions can have more than one time zone. To accurately <a href=\"https:\/\/www.geopostcodes.com\/en-GB\/blog\/how-to-create-zip-code-map\/\" target=\"_blank\" rel=\"noreferrer noopener\">map postcodes<\/a>, you need to find a source that correlates postcodes with states\/counties, assigns time zones to states\/counties, and encodes exceptions where a postcode falls into multiple time zones.<\/p>\n\n\n\n<p class=\"has-background\" style=\"background-color:#d7efff\">\ud83d\udd17 Access the complete time zone reference database covering 200+ countries. It can be used to convert time from one time zone to another. Each entry includes verified UTC offsets, DST rules, Windows\/Olson mappings, and country codes. <a href=\"https:\/\/public.geopostcodes.com\/portal-signup\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Download CSV here.<\/strong><\/a> <\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized ticss-00151db3\"><img fetchpriority=\"high\" decoding=\"async\" width=\"939\" height=\"270\" src=\"https:\/\/www.geopostcodes.com\/en-GB\/wp-content\/uploads\/2023\/01\/timezone-1.webp\" alt=\"Download GeoPostcodes time zone reference database covering 200+ countries\" class=\"wp-image-27705\" style=\"width:803px;height:auto\" srcset=\"https:\/\/www.geopostcodes.com\/en-GB\/wp-content\/uploads\/2023\/01\/timezone-1.webp 939w, https:\/\/www.geopostcodes.com\/en-GB\/wp-content\/uploads\/2023\/01\/timezone-1-300x86.webp 300w, https:\/\/www.geopostcodes.com\/en-GB\/wp-content\/uploads\/2023\/01\/timezone-1-768x221.webp 768w\" sizes=\"(max-width: 939px) 100vw, 939px\" \/><figcaption class=\"wp-element-caption\"><a href=\"https:\/\/public.geopostcodes.com\/portal-signup\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Download<\/strong> the Time Zones and Countries conversion table<\/a> &#8211; File format: CSV (Comma-separated values)<\/figcaption><\/figure>\n\n\n\n<p>Rules get more complicated when you target international data, which is the purpose of this article. So, we will not work with individual time zone rules but use a more convenient method for global data, focusing on geographical <a href=\"https:\/\/www.geopostcodes.com\/en-GB\/blog\/address-matching\/\" target=\"_blank\" rel=\"noreferrer noopener\">matching<\/a> between postcodes and mapped time zones.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"618\" src=\"https:\/\/www.geopostcodes.com\/en-GB\/wp-content\/uploads\/2023\/01\/Area_codes__time_zones_US-1-1024x618.webp\" alt=\"\" class=\"wp-image-32021\" srcset=\"https:\/\/www.geopostcodes.com\/en-GB\/wp-content\/uploads\/2023\/01\/Area_codes__time_zones_US-1-1024x618.webp 1024w, https:\/\/www.geopostcodes.com\/en-GB\/wp-content\/uploads\/2023\/01\/Area_codes__time_zones_US-1-300x181.webp 300w, https:\/\/www.geopostcodes.com\/en-GB\/wp-content\/uploads\/2023\/01\/Area_codes__time_zones_US-1-768x463.webp 768w, https:\/\/www.geopostcodes.com\/en-GB\/wp-content\/uploads\/2023\/01\/Area_codes__time_zones_US-1.webp 1376w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Area codes &amp; time zones US \u00a9 Wikimedia Commons<\/figcaption><\/figure>\n\n\n\n<div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"assigning-time-zones-to-zip-codes\">Assigning Time Zones to Postcodes<\/h2>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>We&#8217;ll discuss where to find the data, how to upload it, and how to use it to assign time zones to postcodes.<\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"sourcing-postcode-data\">Sourcing Postcode Data<\/h3>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>You first need to identify a good source of international postcodes, with geographical information. Free candidates include&nbsp;<a href=\"https:\/\/www.geonames.org\/\" target=\"_blank\" rel=\"noreferrer noopener\">GeoNames<\/a>&nbsp;and&nbsp;<a href=\"https:\/\/www.openstreetmap.org\/#map=4\/38.01\/-95.84\" target=\"_blank\" rel=\"noreferrer noopener\">OpenStreetMap<\/a>.<\/p>\n\n\n\n<p>From those sources, you can access postal codes for a number of countries (and even more if you combine them) along with their latitude and longitude. This tutorial will use GeoNames.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"637\" height=\"534\" src=\"https:\/\/www.geopostcodes.com\/en-GB\/wp-content\/uploads\/2023\/01\/Screenshot_2024-08-12_at_12.54.32_1_optimized_100.webp\" alt=\"GeoPostcodes-Zip code to timezone\" class=\"wp-image-22268\" srcset=\"https:\/\/www.geopostcodes.com\/en-GB\/wp-content\/uploads\/2023\/01\/Screenshot_2024-08-12_at_12.54.32_1_optimized_100.webp 637w, https:\/\/www.geopostcodes.com\/en-GB\/wp-content\/uploads\/2023\/01\/Screenshot_2024-08-12_at_12.54.32_1_optimized_100-300x251.webp 300w\" sizes=\"(max-width: 637px) 100vw, 637px\" \/><figcaption class=\"wp-element-caption\">GeoPostcodes &#8211; Excel Sample<\/figcaption><\/figure>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"has-background\" style=\"background-color:#d7efff\">\ud83d\udca1 Open source data is often unreliable, incomplete, and lacks regular updates to catch up with <a href=\"https:\/\/www.geopostcodes.com\/en-GB\/blog\/how-often-do-zip-codes-change\/\" target=\"_blank\" rel=\"noreferrer noopener\">postcode changes<\/a>. Our location data is updated weekly, relying on more than 1,500 sources. <strong><a href=\"https:\/\/public.geopostcodes.com\/portal-signup\" target=\"_blank\" rel=\"noreferrer noopener\"><span style=\"box-sizing: border-box; margin: 0px; padding: 0px;\">Download the<\/span> free postcode to the time zone Excel sample here.<\/a><\/strong><\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"sourcing-time-zone-data\">Sourcing Time Zone Data and Daylight Saving Time<\/h3>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p><a rel=\"noreferrer noopener\" href=\"https:\/\/www.iana.org\/\" target=\"_blank\">Internet Assigned Numbers Authority<\/a>&nbsp;publishes the most widely used time zone data, including rules and codes for capturing different time zones and accessing past and future time switches from Standard Time to Daylight Saving Time.<\/p>\n\n\n\n<p>We&#8217;ll use a map of the official IANA time zones maintained on&nbsp;<a rel=\"noreferrer noopener\" href=\"https:\/\/github.com\/evansiroky\/timezone-boundary-builder\" target=\"_blank\">Time Zone Boundary Builder<\/a>&nbsp;for our geographical mapping. You can download the&nbsp;<a rel=\"noreferrer noopener\" href=\"https:\/\/github.com\/evansiroky\/timezone-boundary-builder\/releases\" target=\"_blank\">geojson file in the Releases folder<\/a>.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"ticss-aea38abb\"><em>Take the file with oceans if you want to cover the whole earth. Take the one without if you don\u2019t want to set a time zone to points that would fall into oceans (indicating coordinates are likely wrong).<\/em><\/p>\n<\/blockquote>\n\n\n\n<p>The world time zones map, according to the&nbsp;<a href=\"https:\/\/github.com\/evansiroky\/timezone-boundary-builder\/releases\/tag\/2022g\" target=\"_blank\" rel=\"noreferrer noopener\">IANA 2022g release<\/a>, looks like this:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized ticss-e194a12f\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"625\" src=\"https:\/\/www.geopostcodes.com\/en-GB\/wp-content\/uploads\/2023\/01\/nlLkwmt-1024x625.png\" alt=\"IANA World time zones map\" class=\"wp-image-3227\" srcset=\"https:\/\/www.geopostcodes.com\/en-GB\/wp-content\/uploads\/2023\/01\/nlLkwmt-1024x625.png 1024w, https:\/\/www.geopostcodes.com\/en-GB\/wp-content\/uploads\/2023\/01\/nlLkwmt-300x183.png 300w, https:\/\/www.geopostcodes.com\/en-GB\/wp-content\/uploads\/2023\/01\/nlLkwmt-768x469.png 768w, https:\/\/www.geopostcodes.com\/en-GB\/wp-content\/uploads\/2023\/01\/nlLkwmt.png 1302w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\"><em><sub>IANA World time zones map, using an equal area projection, which appears distorted compared to commonly used equal angle maps; those equal angle maps however give more spatial weight to features located further from the Equator. <\/sub><\/em><\/figcaption><\/figure>\n\n\n\n<p>The map only includes the zone name. To use the zones, you\u2019ll need more information (such as the Standard and Daylight Saving Times of each zone, and so on). To obtain additional details, you can process the official IANA files. If you don\u2019t want to run that, or extract data from Wikipedia (scraping or extracting&nbsp;<a href=\"https:\/\/en.wikipedia.org\/wiki\/List_of_tz_database_time_zones\" target=\"_blank\" rel=\"noreferrer noopener\">this table<\/a>), you can get a consolidated&nbsp;<a href=\"https:\/\/public.geopostcodes.com\/time-zones-and-countries-conversion-table\" target=\"_blank\" rel=\"noreferrer noopener\">CSV file from GeoPostcodes<\/a>.<\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"uploading-the-data-to-a-common-database\">Uploading the Data to a Common Database<\/h3>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>To combine the data sources, you\u2019ll benefit from uploading them to a common framework. While it\u2019s perfectly possible to handle the processes with widespread programming languages and libraries (e.g. Python and&nbsp;<a href=\"https:\/\/geopandas.org\/en\/stable\/\" target=\"_blank\" rel=\"noreferrer noopener\">GeoPandas<\/a>), we\u2019ll use a database to store and query our data in this tutorial.<\/p>\n\n\n\n<p>Our preference goes to PostgreSQL with the PostGIS extension, a leading open-source database engine with state-of-the-art geographical data processing features. It offers all the functionalities you need in this case:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Uploading the different data sources<\/li>\n\n\n\n<li>Matching them using geographical attributes or other keys<\/li>\n\n\n\n<li>Capable of storing, querying, and exporting the results<\/li>\n<\/ul>\n\n\n\n<p>It also natively handles time zones, including the IANA zone names, making it a great choice if you want to manage your time data in the same framework as your postcode data. <\/p>\n\n\n\n<p>For a deeper understanding of how postcode data can be integrated into SQL databases efficiently, explore our guide on <a href=\"https:\/\/www.geopostcodes.com\/en-GB\/blog\/postcode-database-sql\/\" target=\"_blank\" rel=\"noreferrer noopener\">creating a postcode database in SQL<\/a>.<\/p>\n\n\n\n<p>1. First, set up a PostgreSQL\/PostGIS database. There are numerous tutorials available for that, but&nbsp;<a href=\"https:\/\/freegistutorial.com\/how-to-install-postgis-on-ubuntu-22-04\/\" target=\"_blank\" rel=\"noreferrer noopener\">we suggest this one<\/a>.<\/p>\n\n\n\n<p>2. After the database is set up, you can upload your different sources to it. We\u2019re assuming in this tutorial that you\u2019ll upload everything to a schema named&nbsp;<code>timezones<\/code>.<\/p>\n\n\n\n<p>All the commands we show here can be run from any SQL client (like&nbsp;<a rel=\"noreferrer noopener\" href=\"https:\/\/www.pgadmin.org\/\" target=\"_blank\">pgAdmin<\/a>&nbsp;or&nbsp;<a rel=\"noreferrer noopener\" href=\"https:\/\/dbeaver.io\/\" target=\"_blank\">DBeaver<\/a>), but also using the&nbsp;<a rel=\"noreferrer noopener\" href=\"https:\/\/www.postgresql.org\/docs\/current\/app-psql.html\" target=\"_blank\">psql<\/a>&nbsp;interactive terminal.<\/p>\n\n\n\n<p>The general psql command syntax looks like this:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"bash\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">psql -tA -U $username -d $database -h $host -c \"#sql_command\"<\/pre>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>It\u2019s useful to&nbsp;<a href=\"https:\/\/www.postgresql.org\/docs\/current\/libpq-pgpass.html\" target=\"_blank\" rel=\"noreferrer noopener\">set up a password file<\/a>&nbsp;to avoid being prompted for your password every time.<\/p>\n<\/blockquote>\n\n\n\n<p>3. Now, it\u2019s time to upload your files. You\u2019ll need to unzip all the files to a common directory (<code>\/home\/timezones<\/code>, in this tutorial). Then, you can upload their data to your PostgreSQL database with the following commands.<\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"geonames-csv\">Geonames.csv<\/h4>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Create a table to host the data:<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"sql\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">CREATE TABLE timezones.geonames_postcodes(\n   iso char(2), \n   postcode varchar(20), \n   place varchar(180), \n   adm1_name varchar(80), \n   adm1_code varchar(20), \n   adm2_name varchar(80), \n   adm2_code varchar(20), \n   adm3_name varchar(80), \n   adm3_code varchar(20), \n   lat float, \n   lng float, \n   geo_accuracy int\n);<\/pre>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Upload the data, here using the&nbsp;<code>copy<\/code>&nbsp;command from psql:<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"bash\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">psql -tA -U $username -d $database -h $host -c \"copy timezones.geonames_postcodes FROM \/home\/timezones\/allCountries.txt CSV HEADER DELIMITER AS E't' ;\"<\/pre>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Alternatively, you can also use the&nbsp;<code>COPY<\/code>&nbsp;from a&nbsp;<a href=\"https:\/\/www.postgresql.org\/docs\/current\/sql-copy.html\" target=\"_blank\" rel=\"noreferrer noopener\">SQL client<\/a>, and most clients offer functionalities to upload a CSV directly from the graphical interface.<\/li>\n<\/ul>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"iana-geojson\">IANA geojson<\/h4>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Leverage the&nbsp;<code>ogr2ogr<\/code>&nbsp;GDAL command to directly upload the&nbsp;<code>geojson<\/code>&nbsp;file with time zone <a href=\"https:\/\/www.geopostcodes.com\/en-GB\/blog\/postal-code-polygon-database\/\" target=\"_blank\" rel=\"noreferrer noopener\">polygons<\/a> to our database:<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"bash\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">ogr2ogr -f \"PostgreSQL\" -clo SCHEMA=timezones PG:\"dbname=postgres user=#user\" combined.json -nln timezone_polygons<\/pre>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"time-zone-information\">Time Zone Information<\/h4>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>You can upload the file available from GeoPostcodes\u2019 website,&nbsp;<a href=\"https:\/\/public.geopostcodes.com\/time-zones-and-countries-conversion-table\" target=\"_blank\" rel=\"noreferrer noopener\">GPC-TIMEZONES.csv<\/a> with the following commands. First, create a table, then upload the CSV:<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"sql\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">CREATE TABLE timezones.timezones_info(\n   iso char(2), \n   country text, \n   timezone text, \n   std_offset char(6), \n   dst_offset char(6), \n   zone_abbrevation char(10), \n   zone_alt_name text\n);<\/pre>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"bash\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">psql -tA -U $username -d $database -h $host -c \"copy timezones.timezones_info FROM \/home\/timezones\/GPC-TIMEZONES.csv CSV HEADER DELIMITER AS ';' ;\"<\/pre>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"preparing-geographical-data\">Preparing Geographical Data<\/h3>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>Once you\u2019ve uploaded the necessary data, it\u2019s a good idea to add a spatial index on the polygon database to speed up the spatial joins:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"sql\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">CREATE INDEX timezones_geom_idx ON timezones.timezone_polygons USING SPGIST(wkb_geometry);<\/pre>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>You\u2019ll also benefit from creating a geometry column in the Geonames table, which you can then invoke for the spatial joins:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"sql\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">ALTER TABLE timezones.geonames_postcodes ADD COLUMN geom geometry(point,4326);<\/pre>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"sql\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">UPDATE timezones.geonames_postcodes\nSET geom = ST_Makepoint(lng,lat);<\/pre>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"linking-postcodes-and-time-zones-with-geographical-matching\">Linking Postcodes and Time Zones with Geographical Matching<\/h3>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>After all your data is stored in the PostgreSQL database, leverage the geographical attributes in the <code>geonames_postcodes<\/code> and <code>timezone_polygons<\/code>&nbsp;tables to join them. Use the <a href=\"https:\/\/www.geopostcodes.com\/en-GB\/blog\/geocoding-building-a-postcode-to-coordinates-converter\/\" target=\"_blank\" rel=\"noreferrer noopener\">coordinates<\/a> of every postcode and check which time zone polygon they fall in.<\/p>\n\n\n\n<p>You can perform this with the following query, creating a new table to store your results:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"sql\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">CREATE TABLE timezones.postcodes_timezones AS\n   SELECT g.iso, g.postcode, t.tzid\n   FROM timezones.geonames_postcodes g\n   JOIN timezones.timezone_polygons t ON ST_Intersects(g.geom,t.wkb_geometry);<\/pre>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>After this process, some postcodes might be mapped to several time zones. This can happen either because time zone polygons overlap (it\u2019s infrequent but it happens) or because the postcode is associated with several localities that fall in more than one time zone.<\/p>\n\n\n\n<p>To properly match the time zone most associated with each postal code, run:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"sql\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">CREATE TABLE timezones.postcodes_tz AS\n   SELECT iso, postcode, mode() WITHIN GROUP(ORDER BY tzid) AS timezone\n   FROM timezones.postcodes_timezones\n   GROUP BY iso, postcode;<\/pre>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Note that in case of a tie,&nbsp;<code>mode<\/code>&nbsp;will arbitrarily select one candidate.<\/p>\n<\/blockquote>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>Once the time zone has been identified, consider gathering extra information about it, like its Standard and Daylight Saving Times. If you want to pull in the information contained in the&nbsp;<code>timezones_info<\/code>&nbsp;table, extend the query to:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"sql\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">SELECT\n   pt.iso,\n   pt.postcode,\n   mode() WITHIN GROUP(ORDER BY pt.tzid) AS timezone,\n   ti.std_offset,\n   ti.dst_offset,\n   ti.zone_abbrevation,\n   ti.zone_alt_name\nFROM timezones.postcodes_timezones pt\nLEFT JOIN timezones.timezones_info ti ON ti.timezone = pt.tzid\nGROUP BY 1, 2, 4, 5, 6, 7;<\/pre>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>The following screenshot shows the result, where you can see every postcode mapped to a single time zone, with high-level information about the time zone:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/i.imgur.com\/iIzUYuF.png\" alt=\"Every postcode mapped to a single time zone\"\/><\/figure>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"has-background\" style=\"background-color:#d7efff\">\ud83d\udd17 <a href=\"https:\/\/public.geopostcodes.com\/portal-signup\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Download free postcode to time zone Excel sample here<\/strong><\/a>. For over 15 years, we&#8217;ve built a GeoPostcodes worldwide postcode database from over 1,500 sources. <\/p>\n\n\n\n<div style=\"height:80px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"known-issues-with-a-postcode-to-time-zone-database\">Known Issues with a Postcode to Time Zone Database<\/h2>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>The IANA time zone polygons are released shortly after any updates to the IANA rules, so the main issues you might encounter will relate to postal data.<\/p>\n\n\n\n<p>Aside from the issue with retrieving a single time zone per postcode in the case of a tie, there are three other areas for potential hiccups to consider:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Country coverage<\/li>\n\n\n\n<li>Coordinates accuracy<\/li>\n\n\n\n<li>Out-of-date postcode data<\/li>\n<\/ul>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"country-coverage\">Country Coverage<\/h3>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>GeoNames and OpenStreetMap provide postcodes for most countries spanning more than one time zone, except for Indonesia in the case of GeoNames. Countries with a single time zone can be mapped to time zones with country-wide rules from the <code>timezones.timezones_info<\/code> table.<\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"coordinates-accuracy\">Coordinates Accuracy<\/h3>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>OpenStreetMap and GeoNames deliver generally reliable coordinates. But an issue of GeoNames is that coordinates are rounded and consequently&nbsp;<a rel=\"noreferrer noopener\" href=\"http:\/\/www.informatik.uni-oldenburg.de\/~there\/ahlers2013girgeonames.pdf\" target=\"_blank\">mapped to a grid in some areas<\/a>.<\/p>\n\n\n\n<p>These coordinates will get you to the correct time zone or a neighboring one, putting you within two hours of the actual local time (accounting for Daylight Saving Time variations).<\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"out-of-date-postcode-data\">Out-of-date Postcode Data<\/h3>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>OpenStreetMap and GeoNames do not always have the most complete and up-to-date postcode data. As a result, you could be missing postcodes. Some OpenStreetMap postcodes should just be discarded altogether, as&nbsp;<a href=\"https:\/\/nominatim.org\/2022\/06\/26\/state-of-postcodes.html\" target=\"_blank\" rel=\"noreferrer noopener\">they don\u2019t respect the country\u2019s postcode format<\/a>.<\/p>\n\n\n\n<p>If you can accommodate small errors (in other words, assign a time zone that\u2019s close to correct), you can look for the closest postcode in your available data. Postcodes usually follow a hierarchical structure, so look for a postcode sharing the same leading characters. For instance, postcode&nbsp;<em>6999<\/em>&nbsp;should be considered closer to&nbsp;<em>6990<\/em>&nbsp;than&nbsp;<em>7000<\/em>, and&nbsp;<em>T2H 0K7<\/em>&nbsp;is closer to&nbsp;<em>T2H 0Y0<\/em>&nbsp;than&nbsp;<em>T2H 1K7<\/em>.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Note of course that approximations can add up in cases like that. If you link a postcode to another alphabetically close postcode, that second postcode can itself have approximative coordinates.<\/p>\n<\/blockquote>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"977\" src=\"https:\/\/www.geopostcodes.com\/en-GB\/wp-content\/uploads\/2023\/01\/items-1024x977.webp\" alt=\"\" class=\"wp-image-32022\" style=\"width:662px;height:auto\" srcset=\"https:\/\/www.geopostcodes.com\/en-GB\/wp-content\/uploads\/2023\/01\/items-1024x977.webp 1024w, https:\/\/www.geopostcodes.com\/en-GB\/wp-content\/uploads\/2023\/01\/items-300x286.webp 300w, https:\/\/www.geopostcodes.com\/en-GB\/wp-content\/uploads\/2023\/01\/items-768x732.webp 768w, https:\/\/www.geopostcodes.com\/en-GB\/wp-content\/uploads\/2023\/01\/items-1536x1465.webp 1536w, https:\/\/www.geopostcodes.com\/en-GB\/wp-content\/uploads\/2023\/01\/items.webp 1661w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<div style=\"height:80px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"conclusion\">Conclusion<\/h2>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>While you can derive time zone information from postcodes using freely available data and software, the quality of the result is highly dependent on the data sources you use.<\/p>\n\n\n\n<p>We\u2019ve highlighted some common issues and explained some workarounds, but you might want to consider a commercial option if you need:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Higher accuracy than the \u00b12 hours solved for in this article<\/li>\n\n\n\n<li>Extra information, such as the dates and times of switching to\/from Daylight Saving Time<\/li>\n\n\n\n<li>Data that\u2019s always up to date<\/li>\n<\/ul>\n\n\n\n<p><a rel=\"noreferrer noopener\" href=\"https:\/\/www.geopostcodes.com\/en-GB\/\" target=\"_blank\">GeoPostcodes<\/a>&nbsp;maintains a worldwide database of postcodes, including up-to-date time zone information for every postcode-locality combination. When a postcode is linked to several time zones, you can access all of them and use locality to filter.<\/p>\n\n\n\n<p>You can have a look at the&nbsp;<a href=\"https:\/\/public.geopostcodes.com\/time-zones-dst\" target=\"_blank\" rel=\"noreferrer noopener\">Timezone product sheet<\/a>&nbsp;or even&nbsp;<a href=\"https:\/\/public.geopostcodes.com\/portal-signup\" target=\"_blank\" rel=\"noreferrer noopener\">browse the data for yourself<\/a>. But don\u2019t hesitate to contact us or <a href=\"https:\/\/public.geopostcodes.com\/request-a-quote\" target=\"_blank\" rel=\"noreferrer noopener\">request a quote<\/a> if you want to know more!<\/p>\n\n\n\n<p>If you&#8217;re looking for ways to leverage Postcode data for enhanced business insights and efficiency, explore how to<a href=\"https:\/\/www.geopostcodes.com\/en-GB\/blog\/add-geocoded-zip-codes-to-salesforce\/\" target=\"_blank\" rel=\"noreferrer noopener\"> add geocoded Postcodes to Salesforce<\/a>, ensure accuracy with<a href=\"https:\/\/www.geopostcodes.com\/en-GB\/blog\/address-validation-microsoft-dynamics-365\/\" target=\"_blank\" rel=\"noreferrer noopener\"> address validation in Microsoft Dynamics 365<\/a>, create impactful visuals by<a href=\"https:\/\/www.geopostcodes.com\/en-GB\/blog\/create-zip-code-map-tableau\/\" target=\"_blank\" rel=\"noreferrer noopener\"> mapping Postcodes in Tableau<\/a>, and optimize logistics by<a href=\"https:\/\/www.geopostcodes.com\/en-GB\/blog\/how-to-calculate-distance-between-two-zip-codes-in-python\/\" target=\"_blank\" rel=\"noreferrer noopener\"> calculating distances between Postcodes using Python<\/a>.<\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">FAQ<\/h2>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div id=\"wp-block-themeisle-blocks-accordion-aa5641a4\" class=\"wp-block-themeisle-blocks-accordion exclusive is-style-default\">\n<details class=\"wp-block-themeisle-blocks-accordion-item\"><summary class=\"wp-block-themeisle-blocks-accordion-item__title\"><div><strong><strong>How is a postcode code\/time zone database useful?<\/strong><\/strong><\/div><\/summary><div class=\"wp-block-themeisle-blocks-accordion-item__content\">\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<p>Timing is crucial for successful customer outreach, whether it&#8217;s reminding them of reservations, conducting surveys, or sending marketing messages. In call centers, timing can be even more critical when live interaction is necessary.<\/p>\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<\/div><\/details>\n\n\n\n<details class=\"wp-block-themeisle-blocks-accordion-item\"><summary class=\"wp-block-themeisle-blocks-accordion-item__title\"><div><strong><strong>What information does a postcode code\/time zone database contain?<\/strong><\/strong><\/div><\/summary><div class=\"wp-block-themeisle-blocks-accordion-item__content\">\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<p>Postcode code\/time zone databases identify the time zone associated with each postcode, enabling accurate time-based calculations and scheduling. They are widely used in scheduling systems, online services, and international communication platforms.<\/p>\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<\/div><\/details>\n\n\n\n<details class=\"wp-block-themeisle-blocks-accordion-item\"><summary class=\"wp-block-themeisle-blocks-accordion-item__title\"><div><strong>How frequently is the postcode code\/time zone database updated?<\/strong><\/div><\/summary><div class=\"wp-block-themeisle-blocks-accordion-item__content\">\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<p>Sometimes, when we update time zones or country information, we may also adjust administrative divisions, which could affect the time zones of specific localities, but it&#8217;s rare.<\/p>\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<\/div><\/details>\n\n\n\n<details class=\"wp-block-themeisle-blocks-accordion-item\"><summary class=\"wp-block-themeisle-blocks-accordion-item__title\"><div><strong>How can a postcode to timezone database benefit the postal service?<\/strong><\/div><\/summary><div class=\"wp-block-themeisle-blocks-accordion-item__content\">\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<p>A postcode to timezone database increases postal service efficiency by accurately timestamping delivery events, optimizing delivery schedules, and ensuring timely parcel handling across different time zones. <\/p>\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<\/div><\/details>\n\n\n\n<details class=\"wp-block-themeisle-blocks-accordion-item\"><summary class=\"wp-block-themeisle-blocks-accordion-item__title\"><div><strong><strong>Do any Postcodes cross time zones?<\/strong><\/strong><\/div><\/summary><div class=\"wp-block-themeisle-blocks-accordion-item__content\">\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<p>Yes, some Postcodes do cross time zones, especially in larger states in the U.S. such as Texas and Idaho. This can create discrepancies in local time within the same Postcode area.<\/p>\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<\/div><\/details>\n\n\n\n<details class=\"wp-block-themeisle-blocks-accordion-item\"><summary class=\"wp-block-themeisle-blocks-accordion-item__title\"><div><strong><strong><strong>What is Postcode to timezone API?<\/strong><\/strong><\/strong><\/div><\/summary><div class=\"wp-block-themeisle-blocks-accordion-item__content\">\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<p>A Postcode to timezone API is a digital tool that allows users to input a Postcode and receive the corresponding timezone information. <\/p>\n\n\n<p>This API is commonly used in applications that require local time calculation based on geographical data.<\/p>\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<\/div><\/details>\n\n\n\n<details class=\"wp-block-themeisle-blocks-accordion-item\"><summary class=\"wp-block-themeisle-blocks-accordion-item__title\"><div><strong><strong><strong><strong>Is Postcode for city or country?<\/strong><\/strong><\/strong><\/strong><\/div><\/summary><div class=\"wp-block-themeisle-blocks-accordion-item__content\">\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<p>Postcodes are used to designate specific geographic areas within a country, primarily for postal purposes. In the United States, Postcodes can represent areas within cities, entire cities, or even rural regions.<\/p>\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<\/div><\/details>\n\n\n\n<details class=\"wp-block-themeisle-blocks-accordion-item\"><summary class=\"wp-block-themeisle-blocks-accordion-item__title\"><div><strong><strong><strong><strong><strong>When did zones become Postcodes?<\/strong><\/strong><\/strong><\/strong><\/strong><\/div><\/summary><div class=\"wp-block-themeisle-blocks-accordion-item__content\">\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<p>Zones were converted into Postcodes in 1963 as part of the United States Postal Service&#8217;s efforts to streamline mail sorting and delivery. The POSTCODE in Postcode stands for &#8220;Zone Improvement Plan.&#8221;<\/p>\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<\/div><\/details>\n\n\n\n<details class=\"wp-block-themeisle-blocks-accordion-item\"><summary class=\"wp-block-themeisle-blocks-accordion-item__title\"><div><strong><strong><strong><strong><strong><strong>How Can I Find the Time Zone by Postcode in Power BI?<\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/div><\/summary><div class=\"wp-block-themeisle-blocks-accordion-item__content\">\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<p>A Power BI Postcode Map helps visualize time zones across regions. To determine a time zone:<\/p>\n\n\n<ol class=\"wp-block-list\">\n\n<li>Use a search tool to find the Postcode\u2019s time zone.<\/li>\n\n\n<li>In most states, time zones follow county boundaries.<\/li>\n\n\n<li>For states like North Dakota, South Dakota, Las Vegas (Nevada), and New Mexico, verify if the Postcode falls in multiple time zones.<\/li>\n\n\n<li>The Eastern Standard Time (EST) zone applies to states in the eastern U.S.<\/li>\n\n<\/ol>\n\n\n<p>Adding Postcode data in Power BI allows for accurate time zone mapping.<\/p>\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<\/div><\/details>\n\n\n\n<details class=\"wp-block-themeisle-blocks-accordion-item\"><summary class=\"wp-block-themeisle-blocks-accordion-item__title\"><div><strong><strong><strong><strong><strong><strong><strong>What is my city time zone?<\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/div><\/summary><div class=\"wp-block-themeisle-blocks-accordion-item__content\">\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<p>You can find your city time zone by using your Postcode to match it with the correct time zone region based on official geographic data.<\/p>\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<\/div><\/details>\n\n\n\n<details class=\"wp-block-themeisle-blocks-accordion-item\"><summary class=\"wp-block-themeisle-blocks-accordion-item__title\"><div><strong><strong><strong><strong><strong><strong><strong>What time zone is the 870 area code in?<\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/strong><\/div><\/summary><div class=\"wp-block-themeisle-blocks-accordion-item__content\">\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<p>The 870 area code covers Postcodes in Arkansas, primarily in the Central Time Zone, though some border regions may observe slight variations depending on Postcode.<\/p>\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<\/div><\/details>\n<\/div>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>In this article, see how you can infer time zones from international postcodes. Sourcing data, link with geographical matching, known issues.<\/p>\n","protected":false},"author":11,"featured_media":3528,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[29],"tags":[36,63,22],"class_list":["post-2823","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-data-processing","tag-postal-product-page","tag-request-pricing-popup","tag-selection"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Build a Postcode to Time Zone Database in 5 Steps<\/title>\n<meta name=\"description\" content=\"In this article, see how you can infer time zones from international postcodes. 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