Week numbers 804

804 has 53 ISO weeks, because 1 January 804 falls on a Thursday. Week 1: Dec 29, 803 – Jan 4, 804 · Week 53: Dec 27, 804 – Jan 2, 805

804 at a glance

Weeks in 80453
Week 1December 29, 803 – January 4, 804
Week 53December 27, 804 – January 2, 805
Days in 804366
Leap yearYes

All Weeks in 804

Week From To Month
Week 1 in 804 December 29, 803 January 4, 804 December / January
Week 2 in 804 January 5, 804 January 11, 804 January
Week 3 in 804 January 12, 804 January 18, 804 January
Week 4 in 804 January 19, 804 January 25, 804 January
Week 5 in 804 January 26, 804 February 1, 804 January / February
Week 6 in 804 February 2, 804 February 8, 804 February
Week 7 in 804 February 9, 804 February 15, 804 February
Week 8 in 804 February 16, 804 February 22, 804 February
Week 9 in 804 February 23, 804 February 29, 804 February
Week 10 in 804 March 1, 804 March 7, 804 March
Week 11 in 804 March 8, 804 March 14, 804 March
Week 12 in 804 March 15, 804 March 21, 804 March
Week 13 in 804 March 22, 804 March 28, 804 March
Week 14 in 804 March 29, 804 April 4, 804 March / April
Week 15 in 804 April 5, 804 April 11, 804 April
Week 16 in 804 April 12, 804 April 18, 804 April
Week 17 in 804 April 19, 804 April 25, 804 April
Week 18 in 804 April 26, 804 May 2, 804 April / May
Week 19 in 804 May 3, 804 May 9, 804 May
Week 20 in 804 May 10, 804 May 16, 804 May
Week 21 in 804 May 17, 804 May 23, 804 May
Week 22 in 804 May 24, 804 May 30, 804 May
Week 23 in 804 May 31, 804 June 6, 804 May / June
Week 24 in 804 June 7, 804 June 13, 804 June
Week 25 in 804 June 14, 804 June 20, 804 June
Week 26 in 804 June 21, 804 June 27, 804 June
Week 27 in 804 June 28, 804 July 4, 804 June / July
Week 28 in 804 July 5, 804 July 11, 804 July
Week 29 in 804 July 12, 804 July 18, 804 July
Week 30 in 804 July 19, 804 July 25, 804 July
Week 31 in 804 July 26, 804 August 1, 804 July / August
Week 32 in 804 August 2, 804 August 8, 804 August
Week 33 in 804 August 9, 804 August 15, 804 August
Week 34 in 804 August 16, 804 August 22, 804 August
Week 35 in 804 August 23, 804 August 29, 804 August
Week 36 in 804 August 30, 804 September 5, 804 August / September
Week 37 in 804 September 6, 804 September 12, 804 September
Week 38 in 804 September 13, 804 September 19, 804 September
Week 39 in 804 September 20, 804 September 26, 804 September
Week 40 in 804 September 27, 804 October 3, 804 September / October
Week 41 in 804 October 4, 804 October 10, 804 October
Week 42 in 804 October 11, 804 October 17, 804 October
Week 43 in 804 October 18, 804 October 24, 804 October
Week 44 in 804 October 25, 804 October 31, 804 October
Week 45 in 804 November 1, 804 November 7, 804 November
Week 46 in 804 November 8, 804 November 14, 804 November
Week 47 in 804 November 15, 804 November 21, 804 November
Week 48 in 804 November 22, 804 November 28, 804 November
Week 49 in 804 November 29, 804 December 5, 804 November / December
Week 50 in 804 December 6, 804 December 12, 804 December
Week 51 in 804 December 13, 804 December 19, 804 December
Week 52 in 804 December 20, 804 December 26, 804 December
Week 53 in 804 December 27, 804 January 2, 805 December / January

Calendars 804

January 804
MoTuWeThFrSaSu
Week 11234
Week 2567891011
Week 312131415161718
Week 419202122232425
Week 5262728293031
February 804
MoTuWeThFrSaSu
Week 51
Week 62345678
Week 79101112131415
Week 816171819202122
Week 923242526272829
March 804
MoTuWeThFrSaSu
Week 101234567
Week 11891011121314
Week 1215161718192021
Week 1322232425262728
Week 14293031
April 804
MoTuWeThFrSaSu
Week 141234
Week 15567891011
Week 1612131415161718
Week 1719202122232425
Week 182627282930
May 804
MoTuWeThFrSaSu
Week 1812
Week 193456789
Week 2010111213141516
Week 2117181920212223
Week 2224252627282930
Week 2331
June 804
MoTuWeThFrSaSu
Week 23123456
Week 2478910111213
Week 2514151617181920
Week 2621222324252627
Week 27282930
July 804
MoTuWeThFrSaSu
Week 271234
Week 28567891011
Week 2912131415161718
Week 3019202122232425
Week 31262728293031
August 804
MoTuWeThFrSaSu
Week 311
Week 322345678
Week 339101112131415
Week 3416171819202122
Week 3523242526272829
Week 363031
September 804
MoTuWeThFrSaSu
Week 3612345
Week 376789101112
Week 3813141516171819
Week 3920212223242526
Week 4027282930
October 804
MoTuWeThFrSaSu
Week 40123
Week 4145678910
Week 4211121314151617
Week 4318192021222324
Week 4425262728293031
November 804
MoTuWeThFrSaSu
Week 451234567
Week 46891011121314
Week 4715161718192021
Week 4822232425262728
Week 492930
December 804
MoTuWeThFrSaSu
Week 212345
Week 506789101112
Week 5113141516171819
Week 5220212223242526
Week 532728293031

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 804 starts on December 29, 803 and ends on January 4, 804 (ISO 8601, Monday to Sunday). 804 has 53 ISO weeks, because 1 January 804 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 804 have?

804 has 53 ISO weeks, because 1 January 804 falls on a Thursday.

When does week 1 of 804 start?

Week 1 of 804 starts on December 29, 803 and ends on January 4, 804 (ISO 8601, Monday to Sunday).

When does the last week of 804 end?

Week 53 of 804 starts on December 27, 804 and ends on January 2, 805 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 804, 809, 815, 820, 826.

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.