Week numbers 4001

4001 has 52 ISO weeks. Week 1: Jan 1 – 7 · Week 52: Dec 24 – 30

4001 at a glance

Weeks in 400152
Week 1January 1, 4001 – January 7, 4001
Week 52December 24, 4001 – December 30, 4001
Days in 4001365
Leap yearNo

All Weeks in 4001

Week From To Month
Week 1 in 4001 January 1, 4001 January 7, 4001 January
Week 2 in 4001 January 8, 4001 January 14, 4001 January
Week 3 in 4001 January 15, 4001 January 21, 4001 January
Week 4 in 4001 January 22, 4001 January 28, 4001 January
Week 5 in 4001 January 29, 4001 February 4, 4001 January / February
Week 6 in 4001 February 5, 4001 February 11, 4001 February
Week 7 in 4001 February 12, 4001 February 18, 4001 February
Week 8 in 4001 February 19, 4001 February 25, 4001 February
Week 9 in 4001 February 26, 4001 March 4, 4001 February / March
Week 10 in 4001 March 5, 4001 March 11, 4001 March
Week 11 in 4001 March 12, 4001 March 18, 4001 March
Week 12 in 4001 March 19, 4001 March 25, 4001 March
Week 13 in 4001 March 26, 4001 April 1, 4001 March / April
Week 14 in 4001 April 2, 4001 April 8, 4001 April
Week 15 in 4001 April 9, 4001 April 15, 4001 April
Week 16 in 4001 April 16, 4001 April 22, 4001 April
Week 17 in 4001 April 23, 4001 April 29, 4001 April
Week 18 in 4001 April 30, 4001 May 6, 4001 April / May
Week 19 in 4001 May 7, 4001 May 13, 4001 May
Week 20 in 4001 May 14, 4001 May 20, 4001 May
Week 21 in 4001 May 21, 4001 May 27, 4001 May
Week 22 in 4001 May 28, 4001 June 3, 4001 May / June
Week 23 in 4001 June 4, 4001 June 10, 4001 June
Week 24 in 4001 June 11, 4001 June 17, 4001 June
Week 25 in 4001 June 18, 4001 June 24, 4001 June
Week 26 in 4001 June 25, 4001 July 1, 4001 June / July
Week 27 in 4001 July 2, 4001 July 8, 4001 July
Week 28 in 4001 July 9, 4001 July 15, 4001 July
Week 29 in 4001 July 16, 4001 July 22, 4001 July
Week 30 in 4001 July 23, 4001 July 29, 4001 July
Week 31 in 4001 July 30, 4001 August 5, 4001 July / August
Week 32 in 4001 August 6, 4001 August 12, 4001 August
Week 33 in 4001 August 13, 4001 August 19, 4001 August
Week 34 in 4001 August 20, 4001 August 26, 4001 August
Week 35 in 4001 August 27, 4001 September 2, 4001 August / September
Week 36 in 4001 September 3, 4001 September 9, 4001 September
Week 37 in 4001 September 10, 4001 September 16, 4001 September
Week 38 in 4001 September 17, 4001 September 23, 4001 September
Week 39 in 4001 September 24, 4001 September 30, 4001 September
Week 40 in 4001 October 1, 4001 October 7, 4001 October
Week 41 in 4001 October 8, 4001 October 14, 4001 October
Week 42 in 4001 October 15, 4001 October 21, 4001 October
Week 43 in 4001 October 22, 4001 October 28, 4001 October
Week 44 in 4001 October 29, 4001 November 4, 4001 October / November
Week 45 in 4001 November 5, 4001 November 11, 4001 November
Week 46 in 4001 November 12, 4001 November 18, 4001 November
Week 47 in 4001 November 19, 4001 November 25, 4001 November
Week 48 in 4001 November 26, 4001 December 2, 4001 November / December
Week 49 in 4001 December 3, 4001 December 9, 4001 December
Week 50 in 4001 December 10, 4001 December 16, 4001 December
Week 51 in 4001 December 17, 4001 December 23, 4001 December
Week 52 in 4001 December 24, 4001 December 30, 4001 December

Calendars 4001

January 4001
MoTuWeThFrSaSu
Week 11234567
Week 2891011121314
Week 315161718192021
Week 422232425262728
Week 5293031
February 4001
MoTuWeThFrSaSu
Week 51234
Week 6567891011
Week 712131415161718
Week 819202122232425
Week 9262728
March 4001
MoTuWeThFrSaSu
Week 91234
Week 10567891011
Week 1112131415161718
Week 1219202122232425
Week 13262728293031
April 4001
MoTuWeThFrSaSu
Week 131
Week 142345678
Week 159101112131415
Week 1616171819202122
Week 1723242526272829
Week 1830
May 4001
MoTuWeThFrSaSu
Week 18123456
Week 1978910111213
Week 2014151617181920
Week 2121222324252627
Week 2228293031
June 4001
MoTuWeThFrSaSu
Week 22123
Week 2345678910
Week 2411121314151617
Week 2518192021222324
Week 26252627282930
July 4001
MoTuWeThFrSaSu
Week 261
Week 272345678
Week 289101112131415
Week 2916171819202122
Week 3023242526272829
Week 313031
August 4001
MoTuWeThFrSaSu
Week 3112345
Week 326789101112
Week 3313141516171819
Week 3420212223242526
Week 352728293031
September 4001
MoTuWeThFrSaSu
Week 3512
Week 363456789
Week 3710111213141516
Week 3817181920212223
Week 3924252627282930
October 4001
MoTuWeThFrSaSu
Week 401234567
Week 41891011121314
Week 4215161718192021
Week 4322232425262728
Week 44293031
November 4001
MoTuWeThFrSaSu
Week 441234
Week 45567891011
Week 4612131415161718
Week 4719202122232425
Week 482627282930
December 4001
MoTuWeThFrSaSu
Week 212
Week 493456789
Week 5010111213141516
Week 5117181920212223
Week 5224252627282930
Week 131

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 4001 starts on January 1, 4001 and ends on January 7, 4001 (ISO 8601, Monday to Sunday). 4001 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 4001 have?

4001 has 52 ISO weeks.

When does week 1 of 4001 start?

Week 1 of 4001 starts on January 1, 4001 and ends on January 7, 4001 (ISO 8601, Monday to Sunday).

When does the last week of 4001 end?

Week 52 of 4001 starts on December 24, 4001 and ends on December 30, 4001 (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.