List of tz database time zones on:
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This is a list of time zones from release of the
For zones in which Daylight Saving is not observed, the DST offset shown in this table is a simple duplication of the SDT offset.
The UTC offsets are based on the current or upcoming database rules. This table does not attempt to document any of the historical data which resides in the database. In Ireland, what Irish law designates as "standard time" is observed during the summer, with clocks turned one hour ahead of UTC. The SDT column shows the offset from UTC during the winter, even in Ireland, where that's referred to as "winter time", and the DST column shows the offset from UTC during the summer, even in Ireland, where that's referred to as "standard time".
Some of zone records use 3 or 4 letter abbreviations that are tied to physical time zones, others use numeric UTC offsets. In Ireland, what Irish law designates as "standard time" is observed during the summer, with clocks turned one hour ahead of UTC. The SDT column shows the abbreviation used during the winter, even in Ireland, and the DST column shows the abbreviation used during the summer, which is "IST", where the "S" in "IST" stands for "Standard", not "Summer".
This is a list of time zones from release of the tz database
The tz database is a collaborative compilation of information about the world's time zones and rules for observing daylight saving time, primarily intended for use with computer programs and operating systems. Paul Eggert has been its editor an ...
.
Legend
Type
* Canonical - The primary, preferred zone name. * Link - An alternative name (alias) which links to a canonical zone. * Link - A standard Link (as above). The dagger symbol (†) signifies that the zone was canonical in a previous version of the database. Historical data for such zones is still preserved in the source code, but it is not included when compiling the database with standard options.UTC offset
Standard Time
Standard time is the synchronization of clocks within a geographical region to a single time standard, rather than a local mean time standard. Generally, standard time agrees with the local mean time at some meridian that passes through the r ...
(SDT) and Daylight Saving Time
Daylight saving time (DST), also referred to as daylight savings time, daylight time (Daylight saving time in the United States, United States and Daylight saving time in Canada, Canada), or summer time (British Summer Time, United Kingdom, ...
(DST) offsets from UTC in hours and minutes.
For zones in which Daylight Saving is not observed, the DST offset shown in this table is a simple duplication of the SDT offset.
The UTC offsets are based on the current or upcoming database rules. This table does not attempt to document any of the historical data which resides in the database. In Ireland, what Irish law designates as "standard time" is observed during the summer, with clocks turned one hour ahead of UTC. The SDT column shows the offset from UTC during the winter, even in Ireland, where that's referred to as "winter time", and the DST column shows the offset from UTC during the summer, even in Ireland, where that's referred to as "standard time".
Time zone abbreviations
Time zone abbreviations for both Standard Time and Daylight Saving Time are shown exactly as they appear in the database. See strftime and its "%Z" field.Some of zone records use 3 or 4 letter abbreviations that are tied to physical time zones, others use numeric UTC offsets. In Ireland, what Irish law designates as "standard time" is observed during the summer, with clocks turned one hour ahead of UTC. The SDT column shows the abbreviation used during the winter, even in Ireland, and the DST column shows the abbreviation used during the summer, which is "IST", where the "S" in "IST" stands for "Standard", not "Summer".
List
See also
*tz database
The tz database is a collaborative compilation of information about the world's time zones and rules for observing daylight saving time, primarily intended for use with computer programs and operating systems. Paul Eggert has been its editor an ...
* List of time zone abbreviations
* Abolition of time zones
Notes
References
Further reading
* For a complete and accurate history of each time zone, refer to the data and commentary in the TZ database itself. {{UTC time offsets *