Articles

What is my tz database?

by Rhyley Bryan

What is my tz database?

TimeZoneDB provides free time zone database for cities of the world. The database is licensed under Creative Commons Attribution 3.0 License. It contains countries name, time zones, abbreviation, GMT offset, and Daylight Saving Time (DST).

What is canonical timezone?

Canonical – The primary, preferred zone name. Deprecated – An older style name, left in the tz database for backwards compatibility, which should generally not be used.

What are valid timezones?

American Time Zones

US Time Zone Time Zone Value Standard Time (UTC)
Central US/Central UTC-06:00
Mountain US/Mountain UTC-07:00
Pacific US/Pacific UTC-08:00
Alaska US/Alaska UTC-09:00

What time zone is IANA in?

IANA (TZDB) time zone information

Zone ID Modern offsets (Notes) Lat / Long (Notes)
Africa/Cairo +02, +03 (30.050, 31.250)
Africa/Casablanca +00, +01 (33.650, -7.583)
Africa/Ceuta +01, +02 (35.883, -5.317)
Africa/El_Aaiun +00, +01 (27.150, -13

What is TZ format?

The tz database is published as a set of text files which list the rules and zone transitions in a human-readable format. For use, these text files are compiled into a set of platform-independent binary files—one per time zone.

How many named time zones are there?

24 zones
By the mid-20th century, most of the world had adopted a system of international time zones, in which the planet is divided into 24 zones spaced at intervals of approximately 15 degrees of longitude.

How do you set a TZ variable?

Setting the Time Zone on a Host

  1. To set the system time zone on Red Hat and SUSE Linux systems, edit: /etc/sysconfig/clock.
  2. To set the TZ variable, edit, /etc/profile , or /home/dbadmin/.bashrc or /home/dbadmin/.bash_profile and add the following line (for example, for the US Eastern Time Zone):

How are time zones defined in the tz database?

Therefore, each of the time zones defined by the tz database may document multiple offsets from UTC, typically including both standard time and daylight saving time . In the time zone text files, each time zone has one or more “zone lines” in one of the time zone text files.

Where are the offsets on the tz database?

This is a list of time zones from release 2021a of the tz database. UTC offsets (columns 6 and 7) are positive east of UTC and negative west of UTC. The UTC DST offset is different from the UTC offset for zones where daylight saving time is observed (see individual time zone pages for details).

Is the tz database in the public domain?

The database attempts to record historical time zones and all civil changes since 1970, the Unix time epoch. It also includes transitions such as daylight saving time, and also records leap seconds. The database, as well as some reference source code, is in the public domain.

Is the tz database of all regions outside Antarctica?

This map, taken from the 2017a edition of the database, is of all the regions outside Antarctica. The tz database is a collaborative compilation of information about the world’s time zones, primarily intended for use with computer programs and operating systems.