Week numbers 4004

4004 has 53 ISO weeks, because 1 January 4004 falls on a Thursday. Week 1: Dec 29, 4003 – Jan 4, 4004 · Week 53: Dec 27, 4004 – Jan 2, 4005

4004 at a glance

Weeks in 400453
Week 1December 29, 4003 – January 4, 4004
Week 53December 27, 4004 – January 2, 4005
Days in 4004366
Leap yearYes

All Weeks in 4004

Week From To Month
Week 1 in 4004 December 29, 4003 January 4, 4004 December / January
Week 2 in 4004 January 5, 4004 January 11, 4004 January
Week 3 in 4004 January 12, 4004 January 18, 4004 January
Week 4 in 4004 January 19, 4004 January 25, 4004 January
Week 5 in 4004 January 26, 4004 February 1, 4004 January / February
Week 6 in 4004 February 2, 4004 February 8, 4004 February
Week 7 in 4004 February 9, 4004 February 15, 4004 February
Week 8 in 4004 February 16, 4004 February 22, 4004 February
Week 9 in 4004 February 23, 4004 February 29, 4004 February
Week 10 in 4004 March 1, 4004 March 7, 4004 March
Week 11 in 4004 March 8, 4004 March 14, 4004 March
Week 12 in 4004 March 15, 4004 March 21, 4004 March
Week 13 in 4004 March 22, 4004 March 28, 4004 March
Week 14 in 4004 March 29, 4004 April 4, 4004 March / April
Week 15 in 4004 April 5, 4004 April 11, 4004 April
Week 16 in 4004 April 12, 4004 April 18, 4004 April
Week 17 in 4004 April 19, 4004 April 25, 4004 April
Week 18 in 4004 April 26, 4004 May 2, 4004 April / May
Week 19 in 4004 May 3, 4004 May 9, 4004 May
Week 20 in 4004 May 10, 4004 May 16, 4004 May
Week 21 in 4004 May 17, 4004 May 23, 4004 May
Week 22 in 4004 May 24, 4004 May 30, 4004 May
Week 23 in 4004 May 31, 4004 June 6, 4004 May / June
Week 24 in 4004 June 7, 4004 June 13, 4004 June
Week 25 in 4004 June 14, 4004 June 20, 4004 June
Week 26 in 4004 June 21, 4004 June 27, 4004 June
Week 27 in 4004 June 28, 4004 July 4, 4004 June / July
Week 28 in 4004 July 5, 4004 July 11, 4004 July
Week 29 in 4004 July 12, 4004 July 18, 4004 July
Week 30 in 4004 July 19, 4004 July 25, 4004 July
Week 31 in 4004 July 26, 4004 August 1, 4004 July / August
Week 32 in 4004 August 2, 4004 August 8, 4004 August
Week 33 in 4004 August 9, 4004 August 15, 4004 August
Week 34 in 4004 August 16, 4004 August 22, 4004 August
Week 35 in 4004 August 23, 4004 August 29, 4004 August
Week 36 in 4004 August 30, 4004 September 5, 4004 August / September
Week 37 in 4004 September 6, 4004 September 12, 4004 September
Week 38 in 4004 September 13, 4004 September 19, 4004 September
Week 39 in 4004 September 20, 4004 September 26, 4004 September
Week 40 in 4004 September 27, 4004 October 3, 4004 September / October
Week 41 in 4004 October 4, 4004 October 10, 4004 October
Week 42 in 4004 October 11, 4004 October 17, 4004 October
Week 43 in 4004 October 18, 4004 October 24, 4004 October
Week 44 in 4004 October 25, 4004 October 31, 4004 October
Week 45 in 4004 November 1, 4004 November 7, 4004 November
Week 46 in 4004 November 8, 4004 November 14, 4004 November
Week 47 in 4004 November 15, 4004 November 21, 4004 November
Week 48 in 4004 November 22, 4004 November 28, 4004 November
Week 49 in 4004 November 29, 4004 December 5, 4004 November / December
Week 50 in 4004 December 6, 4004 December 12, 4004 December
Week 51 in 4004 December 13, 4004 December 19, 4004 December
Week 52 in 4004 December 20, 4004 December 26, 4004 December
Week 53 in 4004 December 27, 4004 January 2, 4005 December / January

Calendars 4004

January 4004
MoTuWeThFrSaSu
Week 11234
Week 2567891011
Week 312131415161718
Week 419202122232425
Week 5262728293031
February 4004
MoTuWeThFrSaSu
Week 51
Week 62345678
Week 79101112131415
Week 816171819202122
Week 923242526272829
March 4004
MoTuWeThFrSaSu
Week 101234567
Week 11891011121314
Week 1215161718192021
Week 1322232425262728
Week 14293031
April 4004
MoTuWeThFrSaSu
Week 141234
Week 15567891011
Week 1612131415161718
Week 1719202122232425
Week 182627282930
May 4004
MoTuWeThFrSaSu
Week 1812
Week 193456789
Week 2010111213141516
Week 2117181920212223
Week 2224252627282930
Week 2331
June 4004
MoTuWeThFrSaSu
Week 23123456
Week 2478910111213
Week 2514151617181920
Week 2621222324252627
Week 27282930
July 4004
MoTuWeThFrSaSu
Week 271234
Week 28567891011
Week 2912131415161718
Week 3019202122232425
Week 31262728293031
August 4004
MoTuWeThFrSaSu
Week 311
Week 322345678
Week 339101112131415
Week 3416171819202122
Week 3523242526272829
Week 363031
September 4004
MoTuWeThFrSaSu
Week 3612345
Week 376789101112
Week 3813141516171819
Week 3920212223242526
Week 4027282930
October 4004
MoTuWeThFrSaSu
Week 40123
Week 4145678910
Week 4211121314151617
Week 4318192021222324
Week 4425262728293031
November 4004
MoTuWeThFrSaSu
Week 451234567
Week 46891011121314
Week 4715161718192021
Week 4822232425262728
Week 492930
December 4004
MoTuWeThFrSaSu
Week 212345
Week 506789101112
Week 5113141516171819
Week 5220212223242526
Week 532728293031

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 4004 starts on December 29, 4003 and ends on January 4, 4004 (ISO 8601, Monday to Sunday). 4004 has 53 ISO weeks, because 1 January 4004 falls on a Thursday.

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 4004 have?

4004 has 53 ISO weeks, because 1 January 4004 falls on a Thursday.

When does week 1 of 4004 start?

Week 1 of 4004 starts on December 29, 4003 and ends on January 4, 4004 (ISO 8601, Monday to Sunday).

When does the last week of 4004 end?

Week 53 of 4004 starts on December 27, 4004 and ends on January 2, 4005 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 4004, 4009, 4015, 4020, 4026.

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.