Week numbers 531

531 has 52 ISO weeks. Week 1: Jan 1 – 7 · Week 52: Dec 24 – 30

531 at a glance

Weeks in 53152
Week 1January 1, 531 – January 7, 531
Week 52December 24, 531 – December 30, 531
Days in 531365
Leap yearNo

All Weeks in 531

Week From To Month
Week 1 in 531 January 1, 531 January 7, 531 January
Week 2 in 531 January 8, 531 January 14, 531 January
Week 3 in 531 January 15, 531 January 21, 531 January
Week 4 in 531 January 22, 531 January 28, 531 January
Week 5 in 531 January 29, 531 February 4, 531 January / February
Week 6 in 531 February 5, 531 February 11, 531 February
Week 7 in 531 February 12, 531 February 18, 531 February
Week 8 in 531 February 19, 531 February 25, 531 February
Week 9 in 531 February 26, 531 March 4, 531 February / March
Week 10 in 531 March 5, 531 March 11, 531 March
Week 11 in 531 March 12, 531 March 18, 531 March
Week 12 in 531 March 19, 531 March 25, 531 March
Week 13 in 531 March 26, 531 April 1, 531 March / April
Week 14 in 531 April 2, 531 April 8, 531 April
Week 15 in 531 April 9, 531 April 15, 531 April
Week 16 in 531 April 16, 531 April 22, 531 April
Week 17 in 531 April 23, 531 April 29, 531 April
Week 18 in 531 April 30, 531 May 6, 531 April / May
Week 19 in 531 May 7, 531 May 13, 531 May
Week 20 in 531 May 14, 531 May 20, 531 May
Week 21 in 531 May 21, 531 May 27, 531 May
Week 22 in 531 May 28, 531 June 3, 531 May / June
Week 23 in 531 June 4, 531 June 10, 531 June
Week 24 in 531 June 11, 531 June 17, 531 June
Week 25 in 531 June 18, 531 June 24, 531 June
Week 26 in 531 June 25, 531 July 1, 531 June / July
Week 27 in 531 July 2, 531 July 8, 531 July
Week 28 in 531 July 9, 531 July 15, 531 July
Week 29 in 531 July 16, 531 July 22, 531 July
Week 30 in 531 July 23, 531 July 29, 531 July
Week 31 in 531 July 30, 531 August 5, 531 July / August
Week 32 in 531 August 6, 531 August 12, 531 August
Week 33 in 531 August 13, 531 August 19, 531 August
Week 34 in 531 August 20, 531 August 26, 531 August
Week 35 in 531 August 27, 531 September 2, 531 August / September
Week 36 in 531 September 3, 531 September 9, 531 September
Week 37 in 531 September 10, 531 September 16, 531 September
Week 38 in 531 September 17, 531 September 23, 531 September
Week 39 in 531 September 24, 531 September 30, 531 September
Week 40 in 531 October 1, 531 October 7, 531 October
Week 41 in 531 October 8, 531 October 14, 531 October
Week 42 in 531 October 15, 531 October 21, 531 October
Week 43 in 531 October 22, 531 October 28, 531 October
Week 44 in 531 October 29, 531 November 4, 531 October / November
Week 45 in 531 November 5, 531 November 11, 531 November
Week 46 in 531 November 12, 531 November 18, 531 November
Week 47 in 531 November 19, 531 November 25, 531 November
Week 48 in 531 November 26, 531 December 2, 531 November / December
Week 49 in 531 December 3, 531 December 9, 531 December
Week 50 in 531 December 10, 531 December 16, 531 December
Week 51 in 531 December 17, 531 December 23, 531 December
Week 52 in 531 December 24, 531 December 30, 531 December

Calendars 531

January 531
MoTuWeThFrSaSu
Week 11234567
Week 2891011121314
Week 315161718192021
Week 422232425262728
Week 5293031
February 531
MoTuWeThFrSaSu
Week 51234
Week 6567891011
Week 712131415161718
Week 819202122232425
Week 9262728
March 531
MoTuWeThFrSaSu
Week 91234
Week 10567891011
Week 1112131415161718
Week 1219202122232425
Week 13262728293031
April 531
MoTuWeThFrSaSu
Week 131
Week 142345678
Week 159101112131415
Week 1616171819202122
Week 1723242526272829
Week 1830
May 531
MoTuWeThFrSaSu
Week 18123456
Week 1978910111213
Week 2014151617181920
Week 2121222324252627
Week 2228293031
June 531
MoTuWeThFrSaSu
Week 22123
Week 2345678910
Week 2411121314151617
Week 2518192021222324
Week 26252627282930
July 531
MoTuWeThFrSaSu
Week 261
Week 272345678
Week 289101112131415
Week 2916171819202122
Week 3023242526272829
Week 313031
August 531
MoTuWeThFrSaSu
Week 3112345
Week 326789101112
Week 3313141516171819
Week 3420212223242526
Week 352728293031
September 531
MoTuWeThFrSaSu
Week 3512
Week 363456789
Week 3710111213141516
Week 3817181920212223
Week 3924252627282930
October 531
MoTuWeThFrSaSu
Week 401234567
Week 41891011121314
Week 4215161718192021
Week 4322232425262728
Week 44293031
November 531
MoTuWeThFrSaSu
Week 441234
Week 45567891011
Week 4612131415161718
Week 4719202122232425
Week 482627282930
December 531
MoTuWeThFrSaSu
Week 212
Week 493456789
Week 5010111213141516
Week 5117181920212223
Week 5224252627282930
Week 131

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Find the week number of a date

How week numbers are counted

Most of the world numbers weeks according to the ISO 8601 standard. A week starts on Monday, and week 1 is the week that contains the first Thursday of the year, which is always the week that contains 4 January.

Week 1 of 531 starts on January 1, 531 and ends on January 7, 531 (ISO 8601, Monday to Sunday). 531 has 52 ISO weeks.

Because of this rule, the first days of January can belong to the last week of the previous year, and the last days of December can belong to week 1 of the next year.

In the United States, weeks usually start on Sunday and week 1 is the week that contains 1 January, so the US week number can differ from the ISO week number.

Frequently Asked Questions (FAQ)

How many weeks does 531 have?

531 has 52 ISO weeks.

When does week 1 of 531 start?

Week 1 of 531 starts on January 1, 531 and ends on January 7, 531 (ISO 8601, Monday to Sunday).

When does the last week of 531 end?

Week 52 of 531 starts on December 24, 531 and ends on December 30, 531 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 533, 539, 544, 550, 556.

Why do the US and Europe show different week numbers?

Europe follows ISO 8601: weeks start on Monday and week 1 is the week with the first Thursday of the year. In the US, weeks usually start on Sunday and week 1 is the week that contains 1 January, so the two numbers can differ by one.