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2012 Week Numbers

ISO 8601 week numbers — every week runs Monday to Sunday.

Current ISO week number

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Week Numbers 2012

Week #	Start date (Mon)	End date (Sun)
▸ 1	Mon, 2 Jan 2012	Sun, 8 Jan 2012
▸ 2	Mon, 9 Jan 2012	Sun, 15 Jan 2012
▸ 3	Mon, 16 Jan 2012	Sun, 22 Jan 2012
▸ 4	Mon, 23 Jan 2012	Sun, 29 Jan 2012
▸ 5	Mon, 30 Jan 2012	Sun, 5 Feb 2012
▸ 6	Mon, 6 Feb 2012	Sun, 12 Feb 2012
▸ 7	Mon, 13 Feb 2012	Sun, 19 Feb 2012
▸ 8	Mon, 20 Feb 2012	Sun, 26 Feb 2012
▸ 9	Mon, 27 Feb 2012	Sun, 4 Mar 2012
▸ 10	Mon, 5 Mar 2012	Sun, 11 Mar 2012
▸ 11	Mon, 12 Mar 2012	Sun, 18 Mar 2012
▸ 12	Mon, 19 Mar 2012	Sun, 25 Mar 2012
▸ 13	Mon, 26 Mar 2012	Sun, 1 Apr 2012
▸ 14	Mon, 2 Apr 2012	Sun, 8 Apr 2012
▸ 15	Mon, 9 Apr 2012	Sun, 15 Apr 2012
▸ 16	Mon, 16 Apr 2012	Sun, 22 Apr 2012
▸ 17	Mon, 23 Apr 2012	Sun, 29 Apr 2012
▸ 18	Mon, 30 Apr 2012	Sun, 6 May 2012
▸ 19	Mon, 7 May 2012	Sun, 13 May 2012
▸ 20	Mon, 14 May 2012	Sun, 20 May 2012
▸ 21	Mon, 21 May 2012	Sun, 27 May 2012
▸ 22	Mon, 28 May 2012	Sun, 3 Jun 2012
▸ 23	Mon, 4 Jun 2012	Sun, 10 Jun 2012
▸ 24	Mon, 11 Jun 2012	Sun, 17 Jun 2012
▸ 25	Mon, 18 Jun 2012	Sun, 24 Jun 2012
▸ 26	Mon, 25 Jun 2012	Sun, 1 Jul 2012
▸ 27	Mon, 2 Jul 2012	Sun, 8 Jul 2012
▸ 28	Mon, 9 Jul 2012	Sun, 15 Jul 2012
▸ 29	Mon, 16 Jul 2012	Sun, 22 Jul 2012
▸ 30	Mon, 23 Jul 2012	Sun, 29 Jul 2012
▸ 31	Mon, 30 Jul 2012	Sun, 5 Aug 2012
▸ 32	Mon, 6 Aug 2012	Sun, 12 Aug 2012
▸ 33	Mon, 13 Aug 2012	Sun, 19 Aug 2012
▸ 34	Mon, 20 Aug 2012	Sun, 26 Aug 2012
▸ 35	Mon, 27 Aug 2012	Sun, 2 Sep 2012
▸ 36	Mon, 3 Sep 2012	Sun, 9 Sep 2012
▸ 37	Mon, 10 Sep 2012	Sun, 16 Sep 2012
▸ 38	Mon, 17 Sep 2012	Sun, 23 Sep 2012
▸ 39	Mon, 24 Sep 2012	Sun, 30 Sep 2012
▸ 40	Mon, 1 Oct 2012	Sun, 7 Oct 2012
▸ 41	Mon, 8 Oct 2012	Sun, 14 Oct 2012
▸ 42	Mon, 15 Oct 2012	Sun, 21 Oct 2012
▸ 43	Mon, 22 Oct 2012	Sun, 28 Oct 2012
▸ 44	Mon, 29 Oct 2012	Sun, 4 Nov 2012
▸ 45	Mon, 5 Nov 2012	Sun, 11 Nov 2012
▸ 46	Mon, 12 Nov 2012	Sun, 18 Nov 2012
▸ 47	Mon, 19 Nov 2012	Sun, 25 Nov 2012
▸ 48	Mon, 26 Nov 2012	Sun, 2 Dec 2012
▸ 49	Mon, 3 Dec 2012	Sun, 9 Dec 2012
▸ 50	Mon, 10 Dec 2012	Sun, 16 Dec 2012
▸ 51	Mon, 17 Dec 2012	Sun, 23 Dec 2012
▸ 52	Mon, 24 Dec 2012	Sun, 30 Dec 2012

About ISO 8601 Week Numbers

Under the ISO 8601 standard, weeks start on Monday and are numbered from 1 to 52 or 53. Week 1 is the week that contains the first Thursday of the year — equivalently, the week containing January 4th. As a result, the first few days of January can fall in the last week of the previous year, and the last days of December can fall in week 1 of the next year.

A year has 53 ISO weeks when it starts on a Thursday, or on a Wednesday in a leap year; otherwise it has 52. 2012 has 52 ISO weeks.