Week numbers 2015

2015 has

ISO weeks

Week 1 of 2015 starts on Monday, December 29, 2014, and week 53 ends on Sunday, January 3, 2016. Weeks follow ISO 8601: Monday start, week 1 holds the year's first Thursday.

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Week 1	December 29, 2014 – January 4, 2015
Week 2	January 5 – January 11, 2015
Week 3	January 12 – January 18, 2015
Week 4	January 19 – January 25, 2015
Week 5	January 26 – February 1, 2015
Week 6	February 2 – February 8, 2015
Week 7	February 9 – February 15, 2015
Week 8	February 16 – February 22, 2015
Week 9	February 23 – March 1, 2015
Week 10	March 2 – March 8, 2015
Week 11	March 9 – March 15, 2015
Week 12	March 16 – March 22, 2015
Week 13	March 23 – March 29, 2015
Week 14	March 30 – April 5, 2015
Week 15	April 6 – April 12, 2015
Week 16	April 13 – April 19, 2015
Week 17	April 20 – April 26, 2015
Week 18	April 27 – May 3, 2015
Week 19	May 4 – May 10, 2015
Week 20	May 11 – May 17, 2015
Week 21	May 18 – May 24, 2015
Week 22	May 25 – May 31, 2015
Week 23	June 1 – June 7, 2015
Week 24	June 8 – June 14, 2015
Week 25	June 15 – June 21, 2015
Week 26	June 22 – June 28, 2015
Week 27	June 29 – July 5, 2015
Week 28	July 6 – July 12, 2015
Week 29	July 13 – July 19, 2015
Week 30	July 20 – July 26, 2015
Week 31	July 27 – August 2, 2015
Week 32	August 3 – August 9, 2015
Week 33	August 10 – August 16, 2015
Week 34	August 17 – August 23, 2015
Week 35	August 24 – August 30, 2015
Week 36	August 31 – September 6, 2015
Week 37	September 7 – September 13, 2015
Week 38	September 14 – September 20, 2015
Week 39	September 21 – September 27, 2015
Week 40	September 28 – October 4, 2015
Week 41	October 5 – October 11, 2015
Week 42	October 12 – October 18, 2015
Week 43	October 19 – October 25, 2015
Week 44	October 26 – November 1, 2015
Week 45	November 2 – November 8, 2015
Week 46	November 9 – November 15, 2015
Week 47	November 16 – November 22, 2015
Week 48	November 23 – November 29, 2015
Week 49	November 30 – December 6, 2015
Week 50	December 7 – December 13, 2015
Week 51	December 14 – December 20, 2015
Week 52	December 21 – December 27, 2015
Week 53	December 28, 2015 – January 3, 2016

How many weeks are in 2015?

2015 has 53 ISO weeks. Most years have 52; a year has 53 when it starts on a Thursday (or on a Wednesday in a leap year).

When does week 1 of 2015 start?

Week 1 of 2015 starts on Monday, December 29, 2014 — ISO week 1 is the week containing the year's first Thursday, so it can start in late December.

What is the Excel formula for week numbers?

=ISOWEEKNUM(A1) returns the ISO week number of the date in A1 (the numbering used on this page); =WEEKNUM(A1) uses the US Sunday-start convention. Both work in Excel and Google Sheets.