Template:Daylight saving active

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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

For each of the following rows, the abbreviation variants (*T, *ST, *DT) of a particular time zone are considered the same region and will produce the same output, thus they can be used interchangeably. But the abbreviation variants may affect the current-offset templates and the current-time templates.

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

Abbreviations		Name	DST currently active? {{Daylight saving active}}	UTC offset h: {{Current hour offset in time zone}}; m: {{Current minute offset in time zone}}			Time [] {{Current hour in time zone}}:{{Current minute in time zone}}			Notes for UTC offset and time
				With DST rule	(|dst=no)	(|dst=no)	With DST rule	(|dst=no)	(|dst=no)
HST		Hawaii Standard Time	(0)	h: -10; m: 0	h: -10; m: 0		15:29	15:29		When dst is NOT set to "no", the *T, *ST and *DT variants of a particular time zone will produce the same output and can be used interchangeably. Otherwise (when using dst=no), *T and *ST will produce the offset without DST adjustment, and *DT will produce the offset with DST adjustment. DST is not observed in Hawaii and in Saskatchewan (except Lloydminster, SK, where MST/MDT is observed).
HAT or HAST	HADT	Hawaii-Aleutian Standard/Daylight Time	(1)	h: -9; m: 0	h: -10; m: 0	h: -9; m: 0	16:29	15:29	16:29
AKT or AKST	AKDT	Alaska Standard/Daylight Time	(1)	h: -8; m: 0	h: -9; m: 0	h: -8; m: 0	17:29	16:29	17:29
PT or PST	PDT	Pacific Standard/Daylight Time	(1)	h: -7; m: 0	h: -8; m: 0	h: -7; m: 0	18:29	17:29	18:29
MT or MST	MDT	Mountain Standard/Daylight Time	(1)	h: -6; m: 0	h: -7; m: 0	h: -6; m: 0	19:29	18:29	19:29
SKT or SKST		Saskatchewan Standard Time	(0)	h: -6; m: 0	h: -6; m: 0		19:29	19:29
CT or CST	CDT	Central Standard/Daylight Time	(1)	h: -5; m: 0	h: -6; m: 0	h: -5; m: 0	20:29	19:29	20:29
ET or EST	EDT	Eastern Standard/Daylight Time	(1)	h: -4; m: 0	h: -5; m: 0	h: -4; m: 0	21:29	20:29	21:29
AT or AST	ADT	Atlantic Standard/Daylight Time	(1)	h: -3; m: 0	h: -4; m: 0	h: -3; m: 0	22:29	21:29	22:29
NT or NST	NDT	Newfoundland Standard/Daylight Time	(1)	h: -2; m: -30	h: -3; m: -30	h: -2; m: -30	22:59	21:59	22:59
GMT	BST	Greenwich Mean Time / British Summer Time	(1)	h: 1; m: 0	h: 0; m: 0	h: 1; m: 0	02:29	01:29	02:29	When dst is NOT set to "no", both the GMT and BST variants of this time zone will produce the same output and can be used interchangeably. Otherwise (when using dst=no), GMT will produce the offset without DST adjustment, and BST will produce the offset with DST adjustment.
WET	WEST	Western European (Summer) Time	(1)	h: 1; m: 0	h: 0; m: 0	h: 1; m: 0	02:29	01:29	02:29	When dst is NOT set to "no", both the *ET and *EST variants of a particular time zone will produce the same output and can be used interchangeably. Otherwise (when using dst=no), *ET will produce the offset without DST adjustment, and *EST will produce the offset with DST adjustment.
CET	CEST	Central European (Summer) Time	(1)	h: 2; m: 0	h: 1; m: 0	h: 2; m: 0	03:29	02:29	03:29
EET	EEST	Eastern European (Summer) Time	(1)	h: 3; m: 0	h: 2; m: 0	h: 3; m: 0	04:29	03:29	04:29
IST		Indian Standard Time	(0)	h: 5; m: 30	h: 5; m: 30		06:59	06:59
AWT or AWST		Australian Western Standard Time	(0)	h: 8; m: 0	h: 8; m: 0		09:29	09:29		When dst is NOT set to "no", the *T, *ST and *DT variants of a particular time zone will produce the same output and can be used interchangeably. Otherwise (when using dst=no), *T and *ST will produce the offset without DST adjustment, and *DT will produce the offset with DST adjustment. DST is not observed in the AWT time zone.
ACT or ACST	ACDT	Australian Central Standard/Daylight Time	(0)	h: 9; m: 30	h: 9; m: 30	h: 10; m: 30	10:59	10:59	11:59
AET or AEST	AEDT	Australian Eastern Standard/Daylight Time	(0)	h: 10; m: 0	h: 10; m: 0	h: 11; m: 0	11:29	11:29	12:29
KST		Korea Standard Time	(0)	h: 9; m: 0	h: 9; m: 0		10:29	10:29		DST is not observed in these time zones. It is not necessary to set dst.
JST		Japan Standard Time	(0)	h: 9; m: 0	h: 9; m: 0		10:29	10:29
NZT or NZST	NZDT	New Zealand Standard/Daylight Time	(0)	h: 12; m: 0	h: 12; m: 0	h: 13; m: 0	13:29	13:29	14:29	When dst is NOT set to "no", the NZT, NZST and NZDT variants of this time zone will produce the same output and can be used interchangeably. Otherwise (when using dst=no), NZT and NZST will produce the offset without DST adjustment, and NZDT will produce the offset with DST adjustment.
		Integer input (e.g. -10)	(0)	h: -10; m: -10	h: -10; m: -10		15:19	15:19		Uses the specified hours and the specified minutes as the UTC offset. e.g. here with UTC−10:10 and UTC+08:08 offsets.
		Integer input (e.g. 8)	(0)	h: 8; m: 8	h: 8; m: 8		09:37	09:37
		Empty input	(0)	h: 0; m: 0	h: 0; m: 0		01:29	01:29		Follows UTC
		Unrecognised string (e.g. FOO)	(0)	h: 0; m: 0	h: 0; m: 0		01:29	01:29

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 ().
• 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 ().

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 ().
• 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 ().
• 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 local time templates ()

	Based on Module:Time	Based on {{Daylight saving active}}
Supported time zones	See Template:Time#Supported time zones	See Template:Daylight saving active/doc/supported time zones
Offset related	{{UTC offset}}	{{Current hour offset in time zone}} {{Current minute offset in time zone}}
Daylight saving related (0 when inactive, 1 when active)	{{Daylight saving offset}}	{{Daylight saving active}}
Time related	{{Time}} {{Timeonly}} {{Dateonly}} {{Current time in time zone}}	{{Current hour in time zone}} {{Current minute in time zone}}

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.