Week numbers 864

864 has 52 ISO weeks. Week 1: Dec 31, 863 – Jan 6, 864 · Week 52: Dec 22 – 28

864 at a glance

Weeks in 86452
Week 1December 31, 863 – January 6, 864
Week 52December 22, 864 – December 28, 864
Days in 864366
Leap yearYes

All Weeks in 864

Week From To Month
Week 1 in 864 December 31, 863 January 6, 864 December / January
Week 2 in 864 January 7, 864 January 13, 864 January
Week 3 in 864 January 14, 864 January 20, 864 January
Week 4 in 864 January 21, 864 January 27, 864 January
Week 5 in 864 January 28, 864 February 3, 864 January / February
Week 6 in 864 February 4, 864 February 10, 864 February
Week 7 in 864 February 11, 864 February 17, 864 February
Week 8 in 864 February 18, 864 February 24, 864 February
Week 9 in 864 February 25, 864 March 2, 864 February / March
Week 10 in 864 March 3, 864 March 9, 864 March
Week 11 in 864 March 10, 864 March 16, 864 March
Week 12 in 864 March 17, 864 March 23, 864 March
Week 13 in 864 March 24, 864 March 30, 864 March
Week 14 in 864 March 31, 864 April 6, 864 March / April
Week 15 in 864 April 7, 864 April 13, 864 April
Week 16 in 864 April 14, 864 April 20, 864 April
Week 17 in 864 April 21, 864 April 27, 864 April
Week 18 in 864 April 28, 864 May 4, 864 April / May
Week 19 in 864 May 5, 864 May 11, 864 May
Week 20 in 864 May 12, 864 May 18, 864 May
Week 21 in 864 May 19, 864 May 25, 864 May
Week 22 in 864 May 26, 864 June 1, 864 May / June
Week 23 in 864 June 2, 864 June 8, 864 June
Week 24 in 864 June 9, 864 June 15, 864 June
Week 25 in 864 June 16, 864 June 22, 864 June
Week 26 in 864 June 23, 864 June 29, 864 June
Week 27 in 864 June 30, 864 July 6, 864 June / July
Week 28 in 864 July 7, 864 July 13, 864 July
Week 29 in 864 July 14, 864 July 20, 864 July
Week 30 in 864 July 21, 864 July 27, 864 July
Week 31 in 864 July 28, 864 August 3, 864 July / August
Week 32 in 864 August 4, 864 August 10, 864 August
Week 33 in 864 August 11, 864 August 17, 864 August
Week 34 in 864 August 18, 864 August 24, 864 August
Week 35 in 864 August 25, 864 August 31, 864 August
Week 36 in 864 September 1, 864 September 7, 864 September
Week 37 in 864 September 8, 864 September 14, 864 September
Week 38 in 864 September 15, 864 September 21, 864 September
Week 39 in 864 September 22, 864 September 28, 864 September
Week 40 in 864 September 29, 864 October 5, 864 September / October
Week 41 in 864 October 6, 864 October 12, 864 October
Week 42 in 864 October 13, 864 October 19, 864 October
Week 43 in 864 October 20, 864 October 26, 864 October
Week 44 in 864 October 27, 864 November 2, 864 October / November
Week 45 in 864 November 3, 864 November 9, 864 November
Week 46 in 864 November 10, 864 November 16, 864 November
Week 47 in 864 November 17, 864 November 23, 864 November
Week 48 in 864 November 24, 864 November 30, 864 November
Week 49 in 864 December 1, 864 December 7, 864 December
Week 50 in 864 December 8, 864 December 14, 864 December
Week 51 in 864 December 15, 864 December 21, 864 December
Week 52 in 864 December 22, 864 December 28, 864 December

Calendars 864

January 864
MoTuWeThFrSaSu
Week 1123456
Week 278910111213
Week 314151617181920
Week 421222324252627
Week 528293031
February 864
MoTuWeThFrSaSu
Week 5123
Week 645678910
Week 711121314151617
Week 818192021222324
Week 92526272829
March 864
MoTuWeThFrSaSu
Week 912
Week 103456789
Week 1110111213141516
Week 1217181920212223
Week 1324252627282930
Week 1431
April 864
MoTuWeThFrSaSu
Week 14123456
Week 1578910111213
Week 1614151617181920
Week 1721222324252627
Week 18282930
May 864
MoTuWeThFrSaSu
Week 181234
Week 19567891011
Week 2012131415161718
Week 2119202122232425
Week 22262728293031
June 864
MoTuWeThFrSaSu
Week 221
Week 232345678
Week 249101112131415
Week 2516171819202122
Week 2623242526272829
Week 2730
July 864
MoTuWeThFrSaSu
Week 27123456
Week 2878910111213
Week 2914151617181920
Week 3021222324252627
Week 3128293031
August 864
MoTuWeThFrSaSu
Week 31123
Week 3245678910
Week 3311121314151617
Week 3418192021222324
Week 3525262728293031
September 864
MoTuWeThFrSaSu
Week 361234567
Week 37891011121314
Week 3815161718192021
Week 3922232425262728
Week 402930
October 864
MoTuWeThFrSaSu
Week 4012345
Week 416789101112
Week 4213141516171819
Week 4320212223242526
Week 442728293031
November 864
MoTuWeThFrSaSu
Week 4412
Week 453456789
Week 4610111213141516
Week 4717181920212223
Week 4824252627282930
December 864
MoTuWeThFrSaSu
Week 491234567
Week 50891011121314
Week 5115161718192021
Week 5222232425262728
Week 1293031

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 864 starts on December 31, 863 and ends on January 6, 864 (ISO 8601, Monday to Sunday). 864 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 864 have?

864 has 52 ISO weeks.

When does week 1 of 864 start?

Week 1 of 864 starts on December 31, 863 and ends on January 6, 864 (ISO 8601, Monday to Sunday).

When does the last week of 864 end?

Week 52 of 864 starts on December 22, 864 and ends on December 28, 864 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 865, 871, 876, 882, 888.

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.