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The tz database partitions the world into regions where local clocks all show the same time. This map was made by combining version 2023d with OpenStreetMap data, using open source software. [1] This is a list of time zones from release 2025a of the tz database. [2]
Each zone line for a zone specifies, for a range of date and time, the offset to UTC for standard time, the name of the set of rules that govern daylight saving time (or a hyphen if standard time always applies), the format for time zone abbreviations, and, for all but the last zone line, the date and time at which the range of date and time ...
A typical NTP client regularly polls one or more NTP servers. The client must compute its time offset and round-trip delay. Time offset θ is positive or negative (client time > server time) difference in absolute time between the two clocks. It is defined by
If present, a dagger (†) indicates the usage of a nautical time zone letter outside of the standard geographic definition of that time zone. Some zones that are north/south of each other in the mid- Pacific differ by 24 hours in time – they have the same time of day but dates that are one day apart.
Unix time [a] is a date and time representation widely used in computing. It measures time by the number of non-leap seconds that have elapsed since 00:00:00 UTC on 1 January 1970, the Unix epoch. For example, at midnight on 1 January 2010, Unix time was 1262304000. Unix time originated as the system time of Unix operating systems.
UTC−04:00 is an identifier for a time offset from UTC of −04:00. It is observed in the Eastern Time Zone (e.g., in Canada and the United States) during the warm months of daylight saving time, as Eastern Daylight Time. The Atlantic Time Zone observes it during standard time (cold months).
{{Current minute offset in time zone|time zone}} where time zone is the desired time zone abbreviation (see below and also the list of time zone abbreviations); If no time zone is given or if the given time zone is not supported, then the output will default to 0; In this case, instead of giving a time zone, an offset (e.g. -30, 45, etc.) can ...
Map of U.S. time zones with new CST and EST areas displayed. Some U.S. time zones, such as the Samoa Time Zone, are not on this map. This is a list of the time offsets by U.S. states, federal district, and territories. For more about the time zones of the U.S. see time in the United States. Most states are entirely contained within one time zone.