Week numbers 525

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

525 at a glance

Weeks in 52552
Week 1January 1, 525 – January 7, 525
Week 52December 24, 525 – December 30, 525
Days in 525365
Leap yearNo

All Weeks in 525

Week From To Month
Week 1 in 525 January 1, 525 January 7, 525 January
Week 2 in 525 January 8, 525 January 14, 525 January
Week 3 in 525 January 15, 525 January 21, 525 January
Week 4 in 525 January 22, 525 January 28, 525 January
Week 5 in 525 January 29, 525 February 4, 525 January / February
Week 6 in 525 February 5, 525 February 11, 525 February
Week 7 in 525 February 12, 525 February 18, 525 February
Week 8 in 525 February 19, 525 February 25, 525 February
Week 9 in 525 February 26, 525 March 4, 525 February / March
Week 10 in 525 March 5, 525 March 11, 525 March
Week 11 in 525 March 12, 525 March 18, 525 March
Week 12 in 525 March 19, 525 March 25, 525 March
Week 13 in 525 March 26, 525 April 1, 525 March / April
Week 14 in 525 April 2, 525 April 8, 525 April
Week 15 in 525 April 9, 525 April 15, 525 April
Week 16 in 525 April 16, 525 April 22, 525 April
Week 17 in 525 April 23, 525 April 29, 525 April
Week 18 in 525 April 30, 525 May 6, 525 April / May
Week 19 in 525 May 7, 525 May 13, 525 May
Week 20 in 525 May 14, 525 May 20, 525 May
Week 21 in 525 May 21, 525 May 27, 525 May
Week 22 in 525 May 28, 525 June 3, 525 May / June
Week 23 in 525 June 4, 525 June 10, 525 June
Week 24 in 525 June 11, 525 June 17, 525 June
Week 25 in 525 June 18, 525 June 24, 525 June
Week 26 in 525 June 25, 525 July 1, 525 June / July
Week 27 in 525 July 2, 525 July 8, 525 July
Week 28 in 525 July 9, 525 July 15, 525 July
Week 29 in 525 July 16, 525 July 22, 525 July
Week 30 in 525 July 23, 525 July 29, 525 July
Week 31 in 525 July 30, 525 August 5, 525 July / August
Week 32 in 525 August 6, 525 August 12, 525 August
Week 33 in 525 August 13, 525 August 19, 525 August
Week 34 in 525 August 20, 525 August 26, 525 August
Week 35 in 525 August 27, 525 September 2, 525 August / September
Week 36 in 525 September 3, 525 September 9, 525 September
Week 37 in 525 September 10, 525 September 16, 525 September
Week 38 in 525 September 17, 525 September 23, 525 September
Week 39 in 525 September 24, 525 September 30, 525 September
Week 40 in 525 October 1, 525 October 7, 525 October
Week 41 in 525 October 8, 525 October 14, 525 October
Week 42 in 525 October 15, 525 October 21, 525 October
Week 43 in 525 October 22, 525 October 28, 525 October
Week 44 in 525 October 29, 525 November 4, 525 October / November
Week 45 in 525 November 5, 525 November 11, 525 November
Week 46 in 525 November 12, 525 November 18, 525 November
Week 47 in 525 November 19, 525 November 25, 525 November
Week 48 in 525 November 26, 525 December 2, 525 November / December
Week 49 in 525 December 3, 525 December 9, 525 December
Week 50 in 525 December 10, 525 December 16, 525 December
Week 51 in 525 December 17, 525 December 23, 525 December
Week 52 in 525 December 24, 525 December 30, 525 December

Calendars 525

January 525
MoTuWeThFrSaSu
Week 11234567
Week 2891011121314
Week 315161718192021
Week 422232425262728
Week 5293031
February 525
MoTuWeThFrSaSu
Week 51234
Week 6567891011
Week 712131415161718
Week 819202122232425
Week 9262728
March 525
MoTuWeThFrSaSu
Week 91234
Week 10567891011
Week 1112131415161718
Week 1219202122232425
Week 13262728293031
April 525
MoTuWeThFrSaSu
Week 131
Week 142345678
Week 159101112131415
Week 1616171819202122
Week 1723242526272829
Week 1830
May 525
MoTuWeThFrSaSu
Week 18123456
Week 1978910111213
Week 2014151617181920
Week 2121222324252627
Week 2228293031
June 525
MoTuWeThFrSaSu
Week 22123
Week 2345678910
Week 2411121314151617
Week 2518192021222324
Week 26252627282930
July 525
MoTuWeThFrSaSu
Week 261
Week 272345678
Week 289101112131415
Week 2916171819202122
Week 3023242526272829
Week 313031
August 525
MoTuWeThFrSaSu
Week 3112345
Week 326789101112
Week 3313141516171819
Week 3420212223242526
Week 352728293031
September 525
MoTuWeThFrSaSu
Week 3512
Week 363456789
Week 3710111213141516
Week 3817181920212223
Week 3924252627282930
October 525
MoTuWeThFrSaSu
Week 401234567
Week 41891011121314
Week 4215161718192021
Week 4322232425262728
Week 44293031
November 525
MoTuWeThFrSaSu
Week 441234
Week 45567891011
Week 4612131415161718
Week 4719202122232425
Week 482627282930
December 525
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 525 starts on January 1, 525 and ends on January 7, 525 (ISO 8601, Monday to Sunday). 525 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 525 have?

525 has 52 ISO weeks.

When does week 1 of 525 start?

Week 1 of 525 starts on January 1, 525 and ends on January 7, 525 (ISO 8601, Monday to Sunday).

When does the last week of 525 end?

Week 52 of 525 starts on December 24, 525 and ends on December 30, 525 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 528, 533, 539, 544, 550.

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.