Week numbers 4201

4201 has 53 ISO weeks, because 1 January 4201 falls on a Thursday. Week 1: Dec 29, 4200 – Jan 4, 4201 · Week 53: Dec 28, 4201 – Jan 3, 4202

4201 at a glance

Weeks in 420153
Week 1December 29, 4200 – January 4, 4201
Week 53December 28, 4201 – January 3, 4202
Days in 4201365
Leap yearNo

All Weeks in 4201

Week From To Month
Week 1 in 4201 December 29, 4200 January 4, 4201 December / January
Week 2 in 4201 January 5, 4201 January 11, 4201 January
Week 3 in 4201 January 12, 4201 January 18, 4201 January
Week 4 in 4201 January 19, 4201 January 25, 4201 January
Week 5 in 4201 January 26, 4201 February 1, 4201 January / February
Week 6 in 4201 February 2, 4201 February 8, 4201 February
Week 7 in 4201 February 9, 4201 February 15, 4201 February
Week 8 in 4201 February 16, 4201 February 22, 4201 February
Week 9 in 4201 February 23, 4201 March 1, 4201 February / March
Week 10 in 4201 March 2, 4201 March 8, 4201 March
Week 11 in 4201 March 9, 4201 March 15, 4201 March
Week 12 in 4201 March 16, 4201 March 22, 4201 March
Week 13 in 4201 March 23, 4201 March 29, 4201 March
Week 14 in 4201 March 30, 4201 April 5, 4201 March / April
Week 15 in 4201 April 6, 4201 April 12, 4201 April
Week 16 in 4201 April 13, 4201 April 19, 4201 April
Week 17 in 4201 April 20, 4201 April 26, 4201 April
Week 18 in 4201 April 27, 4201 May 3, 4201 April / May
Week 19 in 4201 May 4, 4201 May 10, 4201 May
Week 20 in 4201 May 11, 4201 May 17, 4201 May
Week 21 in 4201 May 18, 4201 May 24, 4201 May
Week 22 in 4201 May 25, 4201 May 31, 4201 May
Week 23 in 4201 June 1, 4201 June 7, 4201 June
Week 24 in 4201 June 8, 4201 June 14, 4201 June
Week 25 in 4201 June 15, 4201 June 21, 4201 June
Week 26 in 4201 June 22, 4201 June 28, 4201 June
Week 27 in 4201 June 29, 4201 July 5, 4201 June / July
Week 28 in 4201 July 6, 4201 July 12, 4201 July
Week 29 in 4201 July 13, 4201 July 19, 4201 July
Week 30 in 4201 July 20, 4201 July 26, 4201 July
Week 31 in 4201 July 27, 4201 August 2, 4201 July / August
Week 32 in 4201 August 3, 4201 August 9, 4201 August
Week 33 in 4201 August 10, 4201 August 16, 4201 August
Week 34 in 4201 August 17, 4201 August 23, 4201 August
Week 35 in 4201 August 24, 4201 August 30, 4201 August
Week 36 in 4201 August 31, 4201 September 6, 4201 August / September
Week 37 in 4201 September 7, 4201 September 13, 4201 September
Week 38 in 4201 September 14, 4201 September 20, 4201 September
Week 39 in 4201 September 21, 4201 September 27, 4201 September
Week 40 in 4201 September 28, 4201 October 4, 4201 September / October
Week 41 in 4201 October 5, 4201 October 11, 4201 October
Week 42 in 4201 October 12, 4201 October 18, 4201 October
Week 43 in 4201 October 19, 4201 October 25, 4201 October
Week 44 in 4201 October 26, 4201 November 1, 4201 October / November
Week 45 in 4201 November 2, 4201 November 8, 4201 November
Week 46 in 4201 November 9, 4201 November 15, 4201 November
Week 47 in 4201 November 16, 4201 November 22, 4201 November
Week 48 in 4201 November 23, 4201 November 29, 4201 November
Week 49 in 4201 November 30, 4201 December 6, 4201 November / December
Week 50 in 4201 December 7, 4201 December 13, 4201 December
Week 51 in 4201 December 14, 4201 December 20, 4201 December
Week 52 in 4201 December 21, 4201 December 27, 4201 December
Week 53 in 4201 December 28, 4201 January 3, 4202 December / January

Calendars 4201

January 4201
MoTuWeThFrSaSu
Week 11234
Week 2567891011
Week 312131415161718
Week 419202122232425
Week 5262728293031
February 4201
MoTuWeThFrSaSu
Week 51
Week 62345678
Week 79101112131415
Week 816171819202122
Week 9232425262728
March 4201
MoTuWeThFrSaSu
Week 91
Week 102345678
Week 119101112131415
Week 1216171819202122
Week 1323242526272829
Week 143031
April 4201
MoTuWeThFrSaSu
Week 1412345
Week 156789101112
Week 1613141516171819
Week 1720212223242526
Week 1827282930
May 4201
MoTuWeThFrSaSu
Week 18123
Week 1945678910
Week 2011121314151617
Week 2118192021222324
Week 2225262728293031
June 4201
MoTuWeThFrSaSu
Week 231234567
Week 24891011121314
Week 2515161718192021
Week 2622232425262728
Week 272930
July 4201
MoTuWeThFrSaSu
Week 2712345
Week 286789101112
Week 2913141516171819
Week 3020212223242526
Week 312728293031
August 4201
MoTuWeThFrSaSu
Week 3112
Week 323456789
Week 3310111213141516
Week 3417181920212223
Week 3524252627282930
Week 3631
September 4201
MoTuWeThFrSaSu
Week 36123456
Week 3778910111213
Week 3814151617181920
Week 3921222324252627
Week 40282930
October 4201
MoTuWeThFrSaSu
Week 401234
Week 41567891011
Week 4212131415161718
Week 4319202122232425
Week 44262728293031
November 4201
MoTuWeThFrSaSu
Week 441
Week 452345678
Week 469101112131415
Week 4716171819202122
Week 4823242526272829
Week 4930
December 4201
MoTuWeThFrSaSu
Week 2123456
Week 5078910111213
Week 5114151617181920
Week 5221222324252627
Week 5328293031

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 4201 starts on December 29, 4200 and ends on January 4, 4201 (ISO 8601, Monday to Sunday). 4201 has 53 ISO weeks, because 1 January 4201 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 4201 have?

4201 has 53 ISO weeks, because 1 January 4201 falls on a Thursday.

When does week 1 of 4201 start?

Week 1 of 4201 starts on December 29, 4200 and ends on January 4, 4201 (ISO 8601, Monday to Sunday).

When does the last week of 4201 end?

Week 53 of 4201 starts on December 28, 4201 and ends on January 3, 4202 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 4201, 4207, 4212, 4218, 4224.

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.