Week numbers 801

801 has 52 ISO weeks. Week 1: Jan 1 – 7 · Week 52: Dec 24 – 30

801 at a glance

Weeks in 80152
Week 1January 1, 801 – January 7, 801
Week 52December 24, 801 – December 30, 801
Days in 801365
Leap yearNo

All Weeks in 801

Week From To Month
Week 1 in 801 January 1, 801 January 7, 801 January
Week 2 in 801 January 8, 801 January 14, 801 January
Week 3 in 801 January 15, 801 January 21, 801 January
Week 4 in 801 January 22, 801 January 28, 801 January
Week 5 in 801 January 29, 801 February 4, 801 January / February
Week 6 in 801 February 5, 801 February 11, 801 February
Week 7 in 801 February 12, 801 February 18, 801 February
Week 8 in 801 February 19, 801 February 25, 801 February
Week 9 in 801 February 26, 801 March 4, 801 February / March
Week 10 in 801 March 5, 801 March 11, 801 March
Week 11 in 801 March 12, 801 March 18, 801 March
Week 12 in 801 March 19, 801 March 25, 801 March
Week 13 in 801 March 26, 801 April 1, 801 March / April
Week 14 in 801 April 2, 801 April 8, 801 April
Week 15 in 801 April 9, 801 April 15, 801 April
Week 16 in 801 April 16, 801 April 22, 801 April
Week 17 in 801 April 23, 801 April 29, 801 April
Week 18 in 801 April 30, 801 May 6, 801 April / May
Week 19 in 801 May 7, 801 May 13, 801 May
Week 20 in 801 May 14, 801 May 20, 801 May
Week 21 in 801 May 21, 801 May 27, 801 May
Week 22 in 801 May 28, 801 June 3, 801 May / June
Week 23 in 801 June 4, 801 June 10, 801 June
Week 24 in 801 June 11, 801 June 17, 801 June
Week 25 in 801 June 18, 801 June 24, 801 June
Week 26 in 801 June 25, 801 July 1, 801 June / July
Week 27 in 801 July 2, 801 July 8, 801 July
Week 28 in 801 July 9, 801 July 15, 801 July
Week 29 in 801 July 16, 801 July 22, 801 July
Week 30 in 801 July 23, 801 July 29, 801 July
Week 31 in 801 July 30, 801 August 5, 801 July / August
Week 32 in 801 August 6, 801 August 12, 801 August
Week 33 in 801 August 13, 801 August 19, 801 August
Week 34 in 801 August 20, 801 August 26, 801 August
Week 35 in 801 August 27, 801 September 2, 801 August / September
Week 36 in 801 September 3, 801 September 9, 801 September
Week 37 in 801 September 10, 801 September 16, 801 September
Week 38 in 801 September 17, 801 September 23, 801 September
Week 39 in 801 September 24, 801 September 30, 801 September
Week 40 in 801 October 1, 801 October 7, 801 October
Week 41 in 801 October 8, 801 October 14, 801 October
Week 42 in 801 October 15, 801 October 21, 801 October
Week 43 in 801 October 22, 801 October 28, 801 October
Week 44 in 801 October 29, 801 November 4, 801 October / November
Week 45 in 801 November 5, 801 November 11, 801 November
Week 46 in 801 November 12, 801 November 18, 801 November
Week 47 in 801 November 19, 801 November 25, 801 November
Week 48 in 801 November 26, 801 December 2, 801 November / December
Week 49 in 801 December 3, 801 December 9, 801 December
Week 50 in 801 December 10, 801 December 16, 801 December
Week 51 in 801 December 17, 801 December 23, 801 December
Week 52 in 801 December 24, 801 December 30, 801 December

Calendars 801

January 801
MoTuWeThFrSaSu
Week 11234567
Week 2891011121314
Week 315161718192021
Week 422232425262728
Week 5293031
February 801
MoTuWeThFrSaSu
Week 51234
Week 6567891011
Week 712131415161718
Week 819202122232425
Week 9262728
March 801
MoTuWeThFrSaSu
Week 91234
Week 10567891011
Week 1112131415161718
Week 1219202122232425
Week 13262728293031
April 801
MoTuWeThFrSaSu
Week 131
Week 142345678
Week 159101112131415
Week 1616171819202122
Week 1723242526272829
Week 1830
May 801
MoTuWeThFrSaSu
Week 18123456
Week 1978910111213
Week 2014151617181920
Week 2121222324252627
Week 2228293031
June 801
MoTuWeThFrSaSu
Week 22123
Week 2345678910
Week 2411121314151617
Week 2518192021222324
Week 26252627282930
July 801
MoTuWeThFrSaSu
Week 261
Week 272345678
Week 289101112131415
Week 2916171819202122
Week 3023242526272829
Week 313031
August 801
MoTuWeThFrSaSu
Week 3112345
Week 326789101112
Week 3313141516171819
Week 3420212223242526
Week 352728293031
September 801
MoTuWeThFrSaSu
Week 3512
Week 363456789
Week 3710111213141516
Week 3817181920212223
Week 3924252627282930
October 801
MoTuWeThFrSaSu
Week 401234567
Week 41891011121314
Week 4215161718192021
Week 4322232425262728
Week 44293031
November 801
MoTuWeThFrSaSu
Week 441234
Week 45567891011
Week 4612131415161718
Week 4719202122232425
Week 482627282930
December 801
MoTuWeThFrSaSu
Week 212
Week 493456789
Week 5010111213141516
Week 5117181920212223
Week 5224252627282930
Week 131

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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 801 starts on January 1, 801 and ends on January 7, 801 (ISO 8601, Monday to Sunday). 801 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 801 have?

801 has 52 ISO weeks.

When does week 1 of 801 start?

Week 1 of 801 starts on January 1, 801 and ends on January 7, 801 (ISO 8601, Monday to Sunday).

When does the last week of 801 end?

Week 52 of 801 starts on December 24, 801 and ends on December 30, 801 (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.