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UK Time / British Time

UK TIme - England, Wales, Scotland, Northern Ireland
British Summer Time 2010 - 2012

UK Time di dalam zona waktu Eropa Barat (Western European Time Zone). Seperti halnya di negara-negara Eropa lainnya, Summer (Daylight-Saving) Time diberlakukan di UK Time, di mana waktunya maju satu jam (GMT+1). Setelah Summer, waktu UK Time bergeser 1 jam kembali ke Western European Time (WET) atau (GMT).

Perhatikan tabel metode pergeseran berikut ini:

Daylight Saving Time starts
25 Mar
Summer_begin_clock
When local standard time is about to reach
Sunday, 25 March 2012, 01:00:00 clocks are turned forward 1 hour to
Sunday, 25 March 2012, 02:00:00 local daylight time instead
Seconds before and after the time change forward
Local Date
Local Time
DST
UTC Offset
Time Zone
Sunday, 25 March 2012
00:59:57
No
UTC

00:59:58
No
UTC

00:59:59
No
UTC

01:00:00 → 02:00:00
+1h
UTC+1h

02:00:01
+1h
UTC+1h

02:00:02
+1h
UTC+1h
Daylight Saving Time ends
28 Oct
Summer_end_clock
When local daylight time is about to reach
Sunday, 28 October 2012, 02:00:00 clocks are turned backward 1 hour to
Sunday, 28 October 2012, 01:00:00 local standard time instead
Seconds before and after the time change backward
Local Date
Local Time
DST
UTC Offset
Time Zone
Sunday, 28 Oct 2012
01:59:57
+1h
UTC+1h

01:59:58
+1h
UTC+1h

01:59:59
+1h
UTC+1h

02:00:00 → 01:00:00
No
UTC

01:00:01
No
UTC

01:00:02
No
UTC

Formula untuk menghitung dimulainya European Summer Time [2]:
Sunday (31 − ((((5 * y) ÷ 4) + 4) mod 7)) March at 01:00 GMT

Formula untuk menghitung berakhirnya European Summer Time [2]:
Sunday (31 − ((((5 * y) ÷ 4) + 1) mod 7)) October at 01:00 GMT

Keterangan:
Kedua formula di atas valid hingga 2099.
y adalah tahun, dan untuk non-negatif a, a mod b adalah sisa pembagian setelah pengurangan kedua operand tersebut menjadi integer.

Dari formula di atas diperoleh data European Summer Time hingga 2015 berikut ini:

Tahun
BST Mulai
BST Berakhir
2010
Minggu, 28 Maret
Minggu, 31 Oktober
2011
Minggu, 27 Maret
Minggu, 30 Oktober
2012
Minggu, 25 Maret
Minggu, 28 Oktober
2013
Minggu, 31 Maret
Minggu, 27 Oktober
2014
Minggu, 30 Maret
Minggu, 26 Oktober
2015
Minggu, 29 Maret
Minggu, 25 Oktober

Sumber:
[1] http://wwp.greenwich-mean-time.eu/time-zone/europe/uk/time/
[2] http://en.wikipedia.org/wiki/European_Summer_Time

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