Week numbers 538

538 has 52 ISO weeks. Week 1: Dec 30, 537 – Jan 5, 538 · Week 52: Dec 22 – 28

538 at a glance

Weeks in 53852
Week 1December 30, 537 – January 5, 538
Week 52December 22, 538 – December 28, 538
Days in 538365
Leap yearNo

All Weeks in 538

Week From To Month
Week 1 in 538 December 30, 537 January 5, 538 December / January
Week 2 in 538 January 6, 538 January 12, 538 January
Week 3 in 538 January 13, 538 January 19, 538 January
Week 4 in 538 January 20, 538 January 26, 538 January
Week 5 in 538 January 27, 538 February 2, 538 January / February
Week 6 in 538 February 3, 538 February 9, 538 February
Week 7 in 538 February 10, 538 February 16, 538 February
Week 8 in 538 February 17, 538 February 23, 538 February
Week 9 in 538 February 24, 538 March 2, 538 February / March
Week 10 in 538 March 3, 538 March 9, 538 March
Week 11 in 538 March 10, 538 March 16, 538 March
Week 12 in 538 March 17, 538 March 23, 538 March
Week 13 in 538 March 24, 538 March 30, 538 March
Week 14 in 538 March 31, 538 April 6, 538 March / April
Week 15 in 538 April 7, 538 April 13, 538 April
Week 16 in 538 April 14, 538 April 20, 538 April
Week 17 in 538 April 21, 538 April 27, 538 April
Week 18 in 538 April 28, 538 May 4, 538 April / May
Week 19 in 538 May 5, 538 May 11, 538 May
Week 20 in 538 May 12, 538 May 18, 538 May
Week 21 in 538 May 19, 538 May 25, 538 May
Week 22 in 538 May 26, 538 June 1, 538 May / June
Week 23 in 538 June 2, 538 June 8, 538 June
Week 24 in 538 June 9, 538 June 15, 538 June
Week 25 in 538 June 16, 538 June 22, 538 June
Week 26 in 538 June 23, 538 June 29, 538 June
Week 27 in 538 June 30, 538 July 6, 538 June / July
Week 28 in 538 July 7, 538 July 13, 538 July
Week 29 in 538 July 14, 538 July 20, 538 July
Week 30 in 538 July 21, 538 July 27, 538 July
Week 31 in 538 July 28, 538 August 3, 538 July / August
Week 32 in 538 August 4, 538 August 10, 538 August
Week 33 in 538 August 11, 538 August 17, 538 August
Week 34 in 538 August 18, 538 August 24, 538 August
Week 35 in 538 August 25, 538 August 31, 538 August
Week 36 in 538 September 1, 538 September 7, 538 September
Week 37 in 538 September 8, 538 September 14, 538 September
Week 38 in 538 September 15, 538 September 21, 538 September
Week 39 in 538 September 22, 538 September 28, 538 September
Week 40 in 538 September 29, 538 October 5, 538 September / October
Week 41 in 538 October 6, 538 October 12, 538 October
Week 42 in 538 October 13, 538 October 19, 538 October
Week 43 in 538 October 20, 538 October 26, 538 October
Week 44 in 538 October 27, 538 November 2, 538 October / November
Week 45 in 538 November 3, 538 November 9, 538 November
Week 46 in 538 November 10, 538 November 16, 538 November
Week 47 in 538 November 17, 538 November 23, 538 November
Week 48 in 538 November 24, 538 November 30, 538 November
Week 49 in 538 December 1, 538 December 7, 538 December
Week 50 in 538 December 8, 538 December 14, 538 December
Week 51 in 538 December 15, 538 December 21, 538 December
Week 52 in 538 December 22, 538 December 28, 538 December

Calendars 538

January 538
MoTuWeThFrSaSu
Week 112345
Week 26789101112
Week 313141516171819
Week 420212223242526
Week 52728293031
February 538
MoTuWeThFrSaSu
Week 512
Week 63456789
Week 710111213141516
Week 817181920212223
Week 92425262728
March 538
MoTuWeThFrSaSu
Week 912
Week 103456789
Week 1110111213141516
Week 1217181920212223
Week 1324252627282930
Week 1431
April 538
MoTuWeThFrSaSu
Week 14123456
Week 1578910111213
Week 1614151617181920
Week 1721222324252627
Week 18282930
May 538
MoTuWeThFrSaSu
Week 181234
Week 19567891011
Week 2012131415161718
Week 2119202122232425
Week 22262728293031
June 538
MoTuWeThFrSaSu
Week 221
Week 232345678
Week 249101112131415
Week 2516171819202122
Week 2623242526272829
Week 2730
July 538
MoTuWeThFrSaSu
Week 27123456
Week 2878910111213
Week 2914151617181920
Week 3021222324252627
Week 3128293031
August 538
MoTuWeThFrSaSu
Week 31123
Week 3245678910
Week 3311121314151617
Week 3418192021222324
Week 3525262728293031
September 538
MoTuWeThFrSaSu
Week 361234567
Week 37891011121314
Week 3815161718192021
Week 3922232425262728
Week 402930
October 538
MoTuWeThFrSaSu
Week 4012345
Week 416789101112
Week 4213141516171819
Week 4320212223242526
Week 442728293031
November 538
MoTuWeThFrSaSu
Week 4412
Week 453456789
Week 4610111213141516
Week 4717181920212223
Week 4824252627282930
December 538
MoTuWeThFrSaSu
Week 491234567
Week 50891011121314
Week 5115161718192021
Week 5222232425262728
Week 1293031

Download Calendar in printable A4 PDF

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 538 starts on December 30, 537 and ends on January 5, 538 (ISO 8601, Monday to Sunday). 538 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 538 have?

538 has 52 ISO weeks.

When does week 1 of 538 start?

Week 1 of 538 starts on December 30, 537 and ends on January 5, 538 (ISO 8601, Monday to Sunday).

When does the last week of 538 end?

Week 52 of 538 starts on December 22, 538 and ends on December 28, 538 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 539, 544, 550, 556, 561.

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.