Template:Daylight saving active/sandbox

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This template returns either 0 or 1 to indicate if daylight saving time (DST) is active in the given time zone region:

0	DST is not active
1	DST is active

See below for the currently supported time zones. Note that if DST is only partially observed in a certain time zone, this template returns 1 if DST is active in that part (even though it is not observed/active in the other part).

During DST, the clock is set one hour ahead of standard time.

Usage

{{Daylight saving in time zone | time zone abbreviation | date/time value}}

Template parameters[Edit template data]

This template prefers inline formatting of parameters.

Parameter		Description	Type	Status
time zone abbreviation	1	Abbreviation of the time zone for which it is determined if DST is active. If no time zone is given or if the given time zone is not supported, then the output will default to 0. Example CET	String	suggested
date/time value	2	Date and time for which it is determined if DST would be active in the given time zone. By default, if no value is given, it is determined if DST is active at the current time. Example 6 April 2018 23:00 CET	Date	optional

Supported time zones

From the list of time zone abbreviations, the following time zones are currently supported:

Abbreviations		Name			Notes
HST		Hawaii Standard Time	UTC−10:00		The *T, *ST and *DT variants of a particular time zone are considered the same region and will produce the same output, thus they can be used interchangeably. DST is not observed in Hawaii and in Saskatchewan, Canada (except Lloydminster, SK, where MST/MDT is observed).
HAT or HAST	HADT	Hawaii-Aleutian Standard/Daylight Time	UTC−10:00	UTC−09:00
AKT or AKST	AKDT	Alaska Standard/Daylight Time	UTC−09:00	UTC−08:00
PT or PST	PDT	Pacific Standard/Daylight Time	UTC−08:00	UTC−07:00
MT or MST	MDT	Mountain Standard/Daylight Time	UTC−07:00	UTC−06:00
SKT or SKST		Saskatchewan Standard Time	UTC−06:00
CT or CST	CDT	Central Standard/Daylight Time	UTC−06:00	UTC−05:00
ET or EST	EDT	Eastern Standard/Daylight Time	UTC−05:00	UTC−04:00
AT or AST	ADT	Atlantic Standard/Daylight Time	UTC−04:00	UTC−03:00
NT or NST	NDT	Newfoundland Standard/Daylight Time	UTC−03:30	UTC−02:30
GMT	BST	Greenwich Mean Time / British Summer Time	UTC+00:00	UTC+01:00	Both the GMT and BST variants of this time zone are considered the same region and will produce the same output, thus they can be used interchangeably.
WET	WEST	Western European (Summer) Time	UTC+00:00	UTC+01:00	Both the *ET and *EST variants of a particular time zone are considered the same region and will produce the same output, thus they can be used interchangeably.
CET	CEST	Central European (Summer) Time	UTC+01:00	UTC+02:00
EET	EEST	Eastern European (Summer) Time	UTC+02:00	UTC+03:00
AWT or AWST		Australian Western Standard Time	UTC+08:00		The *T, *ST and *DT variants of a particular time zone are considered the same region and will produce the same output, thus they can be used interchangeably. DST is not observed in the AWT time zone.
ACT or ACST	ACDT	Australian Central Standard/Daylight Time	UTC+09:30	UTC+10:30
AET or AEST	AEDT	Australian Eastern Standard/Daylight Time	UTC+10:00	UTC+11:00
KST		Korea Standard Time	UTC+09:00		DST is not observed in these time zones.
JST		Japan Standard Time	UTC+09:00
NZT or NZST	NZDT	New Zealand Standard/Daylight Time	UTC+12:00	UTC+13:00	The NZT, NZST and NZDT variants of this time zone are considered the same region and will produce the same output, thus they can be used interchangeably.

HAT, AKT, PT, MT, CT, ET, AT, NT

• DST begins on the second Sunday in March at 2 a.m. local standard time and ends on the first Sunday in November at 2 a.m. local daylight saving time ([1][2][3]).
• 2 a.m. HAST, AKST, PST, MST, CST, EST, AST and NST is 12:00, 11:00, 10:00, 9:00, 8:00, 7:00, 6:00 and 5:30 UTC respectively.
• 2 a.m. HADT, AKDT, PDT, MDT, CDT, EDT, ADT and NDT is 11:00, 10:00, 9:00, 8:00, 7:00, 6:00, 5:00 and 4:30 UTC respectively.

WET, CET, EET

• DST begins on the last Sunday in March at 1:00 UTC and ends on the last Sunday in October at 1:00 UTC ([4]).

ACT, AET

• DST begins on the first Sunday in October at 2 a.m. local standard time and ends on the first Sunday in April at 3 a.m. local daylight saving time ([5][6][7]).
• 2 a.m. ACST and AEST is 16:30 and 16:00 UTC (previous day) respectively, which is an offset of 7:30 hours and 8:00 hours respectively from midnight.
• 3 a.m. ACDT and AEDT is 2 a.m. ACST and AEST is 16:30 and 16:00 UTC (previous day) respectively, which is an offset of 7:30 hours and 8:00 hours respectively from midnight.

NZT

• DST begins on the last Sunday in September at 2 a.m. local standard time and ends on the first Sunday in April at 3 a.m. local daylight saving time ([8]).
• 2 a.m. NZST is 14:00 UTC (previous day), which is an offset of 10:00 hours from midnight.
• 3 a.m. NZDT is 2 a.m. NZST is 14:00 UTC (previous day), which is an offset of 10:00 hours from midnight.

Time zone map

Examples

(You may want to this page to update the output.)

*{{Daylight saving in time zone|CET}}

produces

• 1

*{{Daylight saving in time zone|CEST}}

produces

• 1

*{{Daylight saving in time zone|PT}}

produces

• 1

*{{Daylight saving in time zone|ACT}}

produces

• 0

*{{Daylight saving in time zone|NZT}}

produces

• 0

*{{Daylight saving in time zone|ET|10 March 2018 10:00 EST}}

produces

• 0

*{{Daylight saving in time zone|ET|11 March 2018 4:50 EST}}

produces

• 1

*{{Daylight saving in time zone|ET|11 March 2018 4:50}}

produces

• 0

Related templates

Current time

• {{Current time in time zone}}
• {{Current hour in time zone}}
• {{Current minute in time zone}}

Current offset

• {{Current hour offset in time zone}}
• {{Current minute offset in time zone}}

Daylight savings

• {{Daylight saving active}} (0 when false, 1 when true)

The above documentation is transcluded from Template:Daylight saving active/doc. (edit | history)
Editors can experiment in this template's sandbox (edit | diff) and testcases (edit) pages.
Add categories to the /doc subpage. Subpages of this template.