Week numbers 2100

2100 has 52 ISO weeks. Week 1: Jan 4 – 10 · Week 52: Dec 27, 2100 – Jan 2, 2101

2100 at a glance

Weeks in 210052
Week 1January 4, 2100 – January 10, 2100
Week 52December 27, 2100 – January 2, 2101
Days in 2100365
Leap yearNo

All Weeks in 2100

Week From To Month
Week 1 in 2100 January 4, 2100 January 10, 2100 January
Week 2 in 2100 January 11, 2100 January 17, 2100 January
Week 3 in 2100 January 18, 2100 January 24, 2100 January
Week 4 in 2100 January 25, 2100 January 31, 2100 January
Week 5 in 2100 February 1, 2100 February 7, 2100 February
Week 6 in 2100 February 8, 2100 February 14, 2100 February
Week 7 in 2100 February 15, 2100 February 21, 2100 February
Week 8 in 2100 February 22, 2100 February 28, 2100 February
Week 9 in 2100 March 1, 2100 March 7, 2100 March
Week 10 in 2100 March 8, 2100 March 14, 2100 March
Week 11 in 2100 March 15, 2100 March 21, 2100 March
Week 12 in 2100 March 22, 2100 March 28, 2100 March
Week 13 in 2100 March 29, 2100 April 4, 2100 March / April
Week 14 in 2100 April 5, 2100 April 11, 2100 April
Week 15 in 2100 April 12, 2100 April 18, 2100 April
Week 16 in 2100 April 19, 2100 April 25, 2100 April
Week 17 in 2100 April 26, 2100 May 2, 2100 April / May
Week 18 in 2100 May 3, 2100 May 9, 2100 May
Week 19 in 2100 May 10, 2100 May 16, 2100 May
Week 20 in 2100 May 17, 2100 May 23, 2100 May
Week 21 in 2100 May 24, 2100 May 30, 2100 May
Week 22 in 2100 May 31, 2100 June 6, 2100 May / June
Week 23 in 2100 June 7, 2100 June 13, 2100 June
Week 24 in 2100 June 14, 2100 June 20, 2100 June
Week 25 in 2100 June 21, 2100 June 27, 2100 June
Week 26 in 2100 June 28, 2100 July 4, 2100 June / July
Week 27 in 2100 July 5, 2100 July 11, 2100 July
Week 28 in 2100 July 12, 2100 July 18, 2100 July
Week 29 in 2100 July 19, 2100 July 25, 2100 July
Week 30 in 2100 July 26, 2100 August 1, 2100 July / August
Week 31 in 2100 August 2, 2100 August 8, 2100 August
Week 32 in 2100 August 9, 2100 August 15, 2100 August
Week 33 in 2100 August 16, 2100 August 22, 2100 August
Week 34 in 2100 August 23, 2100 August 29, 2100 August
Week 35 in 2100 August 30, 2100 September 5, 2100 August / September
Week 36 in 2100 September 6, 2100 September 12, 2100 September
Week 37 in 2100 September 13, 2100 September 19, 2100 September
Week 38 in 2100 September 20, 2100 September 26, 2100 September
Week 39 in 2100 September 27, 2100 October 3, 2100 September / October
Week 40 in 2100 October 4, 2100 October 10, 2100 October
Week 41 in 2100 October 11, 2100 October 17, 2100 October
Week 42 in 2100 October 18, 2100 October 24, 2100 October
Week 43 in 2100 October 25, 2100 October 31, 2100 October
Week 44 in 2100 November 1, 2100 November 7, 2100 November
Week 45 in 2100 November 8, 2100 November 14, 2100 November
Week 46 in 2100 November 15, 2100 November 21, 2100 November
Week 47 in 2100 November 22, 2100 November 28, 2100 November
Week 48 in 2100 November 29, 2100 December 5, 2100 November / December
Week 49 in 2100 December 6, 2100 December 12, 2100 December
Week 50 in 2100 December 13, 2100 December 19, 2100 December
Week 51 in 2100 December 20, 2100 December 26, 2100 December
Week 52 in 2100 December 27, 2100 January 2, 2101 December / January

Calendars 2100

January 2100
MoTuWeThFrSaSu
Week 53123
Week 145678910
Week 211121314151617
Week 318192021222324
Week 425262728293031
February 2100
MoTuWeThFrSaSu
Week 51234567
Week 6891011121314
Week 715161718192021
Week 822232425262728
March 2100
MoTuWeThFrSaSu
Week 91234567
Week 10891011121314
Week 1115161718192021
Week 1222232425262728
Week 13293031
April 2100
MoTuWeThFrSaSu
Week 131234
Week 14567891011
Week 1512131415161718
Week 1619202122232425
Week 172627282930
May 2100
MoTuWeThFrSaSu
Week 1712
Week 183456789
Week 1910111213141516
Week 2017181920212223
Week 2124252627282930
Week 2231
June 2100
MoTuWeThFrSaSu
Week 22123456
Week 2378910111213
Week 2414151617181920
Week 2521222324252627
Week 26282930
July 2100
MoTuWeThFrSaSu
Week 261234
Week 27567891011
Week 2812131415161718
Week 2919202122232425
Week 30262728293031
August 2100
MoTuWeThFrSaSu
Week 301
Week 312345678
Week 329101112131415
Week 3316171819202122
Week 3423242526272829
Week 353031
September 2100
MoTuWeThFrSaSu
Week 3512345
Week 366789101112
Week 3713141516171819
Week 3820212223242526
Week 3927282930
October 2100
MoTuWeThFrSaSu
Week 39123
Week 4045678910
Week 4111121314151617
Week 4218192021222324
Week 4325262728293031
November 2100
MoTuWeThFrSaSu
Week 441234567
Week 45891011121314
Week 4615161718192021
Week 4722232425262728
Week 482930
December 2100
MoTuWeThFrSaSu
Week 112345
Week 496789101112
Week 5013141516171819
Week 5120212223242526
Week 522728293031

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 2100 starts on January 4, 2100 and ends on January 10, 2100 (ISO 8601, Monday to Sunday). 2100 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 2100 have?

2100 has 52 ISO weeks.

When does week 1 of 2100 start?

Week 1 of 2100 starts on January 4, 2100 and ends on January 10, 2100 (ISO 8601, Monday to Sunday).

When does the last week of 2100 end?

Week 52 of 2100 starts on December 27, 2100 and ends on January 2, 2101 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 2105, 2111, 2116, 2122, 2128.

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.