Week numbers 999

999 has 52 ISO weeks. Week 1: Dec 31, 998 – Jan 6, 999 · Week 52: Dec 23 – 29

999 at a glance

Weeks in 99952
Week 1December 31, 998 – January 6, 999
Week 52December 23, 999 – December 29, 999
Days in 999365
Leap yearNo

All Weeks in 999

Week From To Month
Week 1 in 999 December 31, 998 January 6, 999 December / January
Week 2 in 999 January 7, 999 January 13, 999 January
Week 3 in 999 January 14, 999 January 20, 999 January
Week 4 in 999 January 21, 999 January 27, 999 January
Week 5 in 999 January 28, 999 February 3, 999 January / February
Week 6 in 999 February 4, 999 February 10, 999 February
Week 7 in 999 February 11, 999 February 17, 999 February
Week 8 in 999 February 18, 999 February 24, 999 February
Week 9 in 999 February 25, 999 March 3, 999 February / March
Week 10 in 999 March 4, 999 March 10, 999 March
Week 11 in 999 March 11, 999 March 17, 999 March
Week 12 in 999 March 18, 999 March 24, 999 March
Week 13 in 999 March 25, 999 March 31, 999 March
Week 14 in 999 April 1, 999 April 7, 999 April
Week 15 in 999 April 8, 999 April 14, 999 April
Week 16 in 999 April 15, 999 April 21, 999 April
Week 17 in 999 April 22, 999 April 28, 999 April
Week 18 in 999 April 29, 999 May 5, 999 April / May
Week 19 in 999 May 6, 999 May 12, 999 May
Week 20 in 999 May 13, 999 May 19, 999 May
Week 21 in 999 May 20, 999 May 26, 999 May
Week 22 in 999 May 27, 999 June 2, 999 May / June
Week 23 in 999 June 3, 999 June 9, 999 June
Week 24 in 999 June 10, 999 June 16, 999 June
Week 25 in 999 June 17, 999 June 23, 999 June
Week 26 in 999 June 24, 999 June 30, 999 June
Week 27 in 999 July 1, 999 July 7, 999 July
Week 28 in 999 July 8, 999 July 14, 999 July
Week 29 in 999 July 15, 999 July 21, 999 July
Week 30 in 999 July 22, 999 July 28, 999 July
Week 31 in 999 July 29, 999 August 4, 999 July / August
Week 32 in 999 August 5, 999 August 11, 999 August
Week 33 in 999 August 12, 999 August 18, 999 August
Week 34 in 999 August 19, 999 August 25, 999 August
Week 35 in 999 August 26, 999 September 1, 999 August / September
Week 36 in 999 September 2, 999 September 8, 999 September
Week 37 in 999 September 9, 999 September 15, 999 September
Week 38 in 999 September 16, 999 September 22, 999 September
Week 39 in 999 September 23, 999 September 29, 999 September
Week 40 in 999 September 30, 999 October 6, 999 September / October
Week 41 in 999 October 7, 999 October 13, 999 October
Week 42 in 999 October 14, 999 October 20, 999 October
Week 43 in 999 October 21, 999 October 27, 999 October
Week 44 in 999 October 28, 999 November 3, 999 October / November
Week 45 in 999 November 4, 999 November 10, 999 November
Week 46 in 999 November 11, 999 November 17, 999 November
Week 47 in 999 November 18, 999 November 24, 999 November
Week 48 in 999 November 25, 999 December 1, 999 November / December
Week 49 in 999 December 2, 999 December 8, 999 December
Week 50 in 999 December 9, 999 December 15, 999 December
Week 51 in 999 December 16, 999 December 22, 999 December
Week 52 in 999 December 23, 999 December 29, 999 December

Calendars 999

January 999
MoTuWeThFrSaSu
Week 1123456
Week 278910111213
Week 314151617181920
Week 421222324252627
Week 528293031
February 999
MoTuWeThFrSaSu
Week 5123
Week 645678910
Week 711121314151617
Week 818192021222324
Week 925262728
March 999
MoTuWeThFrSaSu
Week 9123
Week 1045678910
Week 1111121314151617
Week 1218192021222324
Week 1325262728293031
April 999
MoTuWeThFrSaSu
Week 141234567
Week 15891011121314
Week 1615161718192021
Week 1722232425262728
Week 182930
May 999
MoTuWeThFrSaSu
Week 1812345
Week 196789101112
Week 2013141516171819
Week 2120212223242526
Week 222728293031
June 999
MoTuWeThFrSaSu
Week 2212
Week 233456789
Week 2410111213141516
Week 2517181920212223
Week 2624252627282930
July 999
MoTuWeThFrSaSu
Week 271234567
Week 28891011121314
Week 2915161718192021
Week 3022232425262728
Week 31293031
August 999
MoTuWeThFrSaSu
Week 311234
Week 32567891011
Week 3312131415161718
Week 3419202122232425
Week 35262728293031
September 999
MoTuWeThFrSaSu
Week 351
Week 362345678
Week 379101112131415
Week 3816171819202122
Week 3923242526272829
Week 4030
October 999
MoTuWeThFrSaSu
Week 40123456
Week 4178910111213
Week 4214151617181920
Week 4321222324252627
Week 4428293031
November 999
MoTuWeThFrSaSu
Week 44123
Week 4545678910
Week 4611121314151617
Week 4718192021222324
Week 48252627282930
December 999
MoTuWeThFrSaSu
Week 21
Week 492345678
Week 509101112131415
Week 5116171819202122
Week 5223242526272829
Week 13031

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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 999 starts on December 31, 998 and ends on January 6, 999 (ISO 8601, Monday to Sunday). 999 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 999 have?

999 has 52 ISO weeks.

When does week 1 of 999 start?

Week 1 of 999 starts on December 31, 998 and ends on January 6, 999 (ISO 8601, Monday to Sunday).

When does the last week of 999 end?

Week 52 of 999 starts on December 23, 999 and ends on December 29, 999 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 1001, 1007, 1012, 1018, 1024.

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.