Time zone and daylight-saving rules are controlled by individual governments. They are sometimes changed with little notice, and their histories and planned futures are often recorded only fitfully.
Here is a summary of attempts to organize and record relevant data in this area. The public-domain time zone database contains code and data that represent the history of local time for many representative locations around the globe.
It is updated periodically to reflect changes made by political bodies to time zone boundaries and daylight saving rules.
Each main entry in the database represents a timezone for a set of civil-time clocks that have all agreed since Timezones are typically identified by continent or ocean and then by the name of the largest city within the region containing the clocks.
The database also records when daylight saving time was in use, along with some time zone abbreviations such as EST for Eastern Standard Time in the US.
Alternatively, the following shell commands download the same release in a single-tarball format containing extra data useful for regression testing:. Older releases are in files named tzcode V. Sinceeach version has been a four-digit year followed by lower-case letter a through zthen za through zzthen zza through zzzand so on.
Area Code Time Zone Lookup
Since version h, each release has contained a text file named " version " whose first and currently only line is the version. The releases are also available in an FTP directory via a less-secure protocol.
Alternatively, a development repository of code and data can be retrieved from GitHub via the shell command:. Since version e, each release has been tagged in development repositories. Untagged commits are less well tested and probably contain more errors. The code lets you compile the tz source files into machine-readable binary files, one for each location. The code also lets you read a TZif file and interpret timestamps for that location.
The tz code and data are by no means authoritative. If you find errors, please send changes to tz iana. You can also subscribe to it and browse the archive of old messages. Metadata for mailing list discussions and corresponding data changes can be generated automatically.
If your government plans to change its time zone boundaries or daylight saving rules, inform tz iana. With less than a year's notice there is a good chance that some computer-based clocks will operate incorrectly after the change, due to delays in propagating updates to software and data.
The shorter the notice, the more likely clock problems will arise; see " On the Timing of Time Zone Changes " for examples. Changes to the tz code and data are often propagated to clients via operating system updates, so client tz data can often be corrected by applying these updates. More detail can be found in Theory and pragmatics of the tz code and data. A0 TimeZone Migration displays changes between recent tzdb versions. Geographical boundaries between timezones are available from several geolocation services and other sources.No one wants to spend hours — or even days — manually researching, scraping data sources and doing complex conversions just to get a list of cities.
Since we launched in we estimate that our database has saved businesses and individuals over 14, hours of manual work. You can be confident that the data is correct. Our list of all US cities uses information from official sources only — including the US Census Bureau, US Geological Survey and American Community Survey — and all currently incorporated cities, towns, villages, townships and boroughs in the United States are included.
The database is completely refreshed every quarter and undergoes regression testing and quality assurance checks before each release. There are no limits on the number of devices or users, so you are free to work and grow without worrying about artificial ceilings. Take a look at the available packages.
Your dataset provided this and came with scripts for loading into SQL without any extra work. We will probably implement geosearch, so having the data ready is great… This was a great purchase worth every penny. All currently incorporated cities, towns, villages, townships and boroughs in the U. Census Designated Places populated areas which don't have a municipal government, but which otherwise physically resemble incorporated places are also included.
The database covers all 50 U.
List of U.S. states and territories by time zone
We serve customers from major national companies like General Electric, Deloitte and Prudentialthrough to web development, design and marketing agencies across the U.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. When users register with our app, we are able to infer their zip code when we validate them against a national database. What would be the best way to determine a good potential guess of their time zone from this zip code? We are trying to minimize the amount of data we explicitly have to ask them for.
They will be able to manually set the time zone later if our best guess is wrong. I realize zip codes won't help with figuring out the time zone outside the US, but in that case we'd have to manually ask anyway, and we deal predominantly with the US regardless. I've found a lot of zip code databases, and so far only a few contain time zone information, but those that do are not free, such as this one.
If it's absolutely necessary to pay a subscription to a service in order to do this, then it will not be worth it and we will just have to ask users explicitly. I just found a free zip database that includes time offset and participation in DST.
I think I may try to set up a simple version of Development 4. Most states are in exactly one time zone though there are a few exceptions. Most zip codes do not cross state boundaries though there are a few exceptions. Here's a list of zip code ranges per stateand a list of states per time zone. You can see the boundaries of zip codes and compare to the timezone map using this linkor Google Earth, to map zips to time zones for the states that are split by a time zone line.
The majority of non-US countries you are dealing with are probably in exactly one time zone. You may want to look at where your top-N non-US visitors come from and just lookup their time zone.
They require a unix timestamp on the querystring. From the response returned it appears that timeZoneName takes into account daylight savings, based on the timestamp, while timeZoneId is a DST-independent name for the timezone.
It's fast, small, and has no external dependencies, but keep in mind that zip codes just don't map perfectly to timezones. I recently made a Ruby hash of all the zipcodes in the US and their associated timezones that you could use if you're interested.Below are reports and other information associated with Area Code Relief Planning. NPA Relief Planning Trigger Report - Certain relief planning activities may be keyed to the occurrence of a future event or trigger point identified by the industry.
This report lists these events and associated activities. NPAs Planned but not yet in service - Lists assigned NPAs that are not in service, to include the anticipated in-service date if known.
Database field definitions are available. Search for Area Code Listings - Provides information about an area code, to include whether it is assigned, the location and in-service date, time zone and basic dialing plan. Area Code Relief Planning Information.
Planning Letters - Provides detailed information about a specific NPA relief planning effort, to include implementation schedules, dialing plans, test numbers, maps, contact information and other important data.
Industry Consensus Process - Provides a description of the consensus process, which is used in NPA relief planning meetings to address issues and reach agreement.
All Rights Reserved.North American area codes database one month Zip Code Genie looks up and Zip Code It! Offeres almost every zip code in the united states. Also do The Software includes postal code, city name, colony name, area abbreviation, latitude and longitude, time zone and area code in Almeria. Enter 2 area name and get the As you type in The database includes Postal code, city name, province name, province abbreviation and phone area code in Canada. The complete The database includes ZIP code, city name, alias name, state code, area code, city type, county name The database includes ZIP code, city name, alias city name, state code, phone area code, city type, county name The database includes postal code, city name, colony name, state code, state name, latitude and longitude, time zone and area code in Mexico.
Mexico postal The database includes postal code, city name, colony name Author Hexa Software Development Center. The database includes postal code, city name, province name, area code, timezone, elevation, population, latitude The database includes Postal code, city name, province name, phone area code, timezone, latitude, longitude and The database includes Postal code, city name, province name, phone area code, timezone, latitude and longitude Category Business - Misc Applications.
Using the 3 digit area code and 3 digit exchange The area code is the first CDXZipStream also has built If you want to Novell in no way endorses or is affiliated with Dave's Novell Shareware. Dave's Novell Shareware disclaims any responsibility for software obtained through this site. Download: Area Code Csv. Zip Code Genie.The most comprehensive database of all 28, cities, towns and villages in Canada — with linked counties, provinces, postcode areas, coordinates and more.
It is ideal for website development, location lookups and data verification. Updated for Spring Get clean, consistent and well-organized data in one single download, with no need for lookups or complex conversions.
All 28, city and town records include linked location information including county, province, postcode area, map reference, latitude-longitude, census division, area code and time zone. This means you can use the data quickly and easily, without any time-consuming imports or file conversions. You can have complete confidence in the quality and accuracy of our data. The last complete refresh was on the 5th May There are no restrictive license conditions or ongoing fees. The list is yours to use permanently without renewal charges, there are no limits on the number of devices or users, and you can use the data for commercial purposes at no extra cost.
Historical and abandoned settlements are not included. You're free to use the data for business and commercial purposes and without attribution. Please see the licencing terms and conditions for more information. With the annual subscription package you can download the list today, plus you'll receive complete updates every quarter for the next year. Hundreds of software development, marketing, engineering and logistics companies across Canada rely on our city list to help run their public and internal computer systems.
It's frequently used for location searches, auto-fill functions, data verification and interfacing with internal Resource Planning systems. We use the latest official information from Canadian Government sources only.
The data undergoes a complete refresh every quarter and undergoes regression testing and quality assurance checks before each release. You can download a sample or check the data with the live online search. The last update was made on the 5th May This release was a full quarterly refresh which updated place names, coordinates, and accompanying postcodes. Home Try the data Specifications Contact Pricing. Get the free sample. Our data is used by…. Comprehensive location data, in one single file Get clean, consistent and well-organized data in one single download, with no need for lookups or complex conversions.
Updated for Spring You can have complete confidence in the quality and accuracy of our data. The list covers all 13 provinces and territories in Canada, with no gaps in the data. Can I use the data commercially?
Can I get future updates? Who else uses the data? How reliable is the data? When was the data last updated?This database contains the same data as found in The Zip Code Companion software utility. Specifically, the database file contains the following fields:. If you need more than these 5 fields of data such as Counties and Latitude and Longitudethen click here.
Approximately 43, ZIP Codes are included in this database. The database is updated annually. The last update occurred in August There is no subscription plan, however, customers are automatically notified when updates occur. To order the database in dBase III format, click here single user license.
Unconvinced or skeptical? If you would like to download a free sample database, containing several hundred entries before you make your decision to purchase, you can click here :.
If you have any pre-sales questions, please contact us. Single User License The Zip Code database is to be used on a single PC, and where the database cannot be accessed by other computers on a network. Note: The complete database file can be downloaded after your order has been received and processed. Details on where to find the database file will then be emailed to you. ZIP Code Databases. This license also allows the use of the Zip Code database for an application that is on a computer network.
The data cannot be used in an application that is resold see Developer License below. The database cannot be resold all or in part.
Developer License The Developer License allows you to incorporate any part of the Zip Code database on an "unlimited basis" in custom applications that you have developed and provided that the data is not easy to copy or steal.
The Zip Code database cannot be sold individually by itselfbut must accompany your application at all times. Leaving the Zip Code database in an unencrypted, external file is not permitted. The Zip Code database must be embedded into your application, unable to be altered or copied by the end user, or the database file must be encrypted external to your application. Note: For companies or developers who wish to include the database into their own applications or make the database available on a local area network, click here.
Download a database sample:.