Week numbers 821

821 has 52 ISO weeks. Week 1: Jan 4 – 10 · Week 52: Dec 27, 821 – Jan 2, 822

821 at a glance

Weeks in 82152
Week 1January 4, 821 – January 10, 821
Week 52December 27, 821 – January 2, 822
Days in 821365
Leap yearNo

All Weeks in 821

Week From To Month
Week 1 in 821 January 4, 821 January 10, 821 January
Week 2 in 821 January 11, 821 January 17, 821 January
Week 3 in 821 January 18, 821 January 24, 821 January
Week 4 in 821 January 25, 821 January 31, 821 January
Week 5 in 821 February 1, 821 February 7, 821 February
Week 6 in 821 February 8, 821 February 14, 821 February
Week 7 in 821 February 15, 821 February 21, 821 February
Week 8 in 821 February 22, 821 February 28, 821 February
Week 9 in 821 March 1, 821 March 7, 821 March
Week 10 in 821 March 8, 821 March 14, 821 March
Week 11 in 821 March 15, 821 March 21, 821 March
Week 12 in 821 March 22, 821 March 28, 821 March
Week 13 in 821 March 29, 821 April 4, 821 March / April
Week 14 in 821 April 5, 821 April 11, 821 April
Week 15 in 821 April 12, 821 April 18, 821 April
Week 16 in 821 April 19, 821 April 25, 821 April
Week 17 in 821 April 26, 821 May 2, 821 April / May
Week 18 in 821 May 3, 821 May 9, 821 May
Week 19 in 821 May 10, 821 May 16, 821 May
Week 20 in 821 May 17, 821 May 23, 821 May
Week 21 in 821 May 24, 821 May 30, 821 May
Week 22 in 821 May 31, 821 June 6, 821 May / June
Week 23 in 821 June 7, 821 June 13, 821 June
Week 24 in 821 June 14, 821 June 20, 821 June
Week 25 in 821 June 21, 821 June 27, 821 June
Week 26 in 821 June 28, 821 July 4, 821 June / July
Week 27 in 821 July 5, 821 July 11, 821 July
Week 28 in 821 July 12, 821 July 18, 821 July
Week 29 in 821 July 19, 821 July 25, 821 July
Week 30 in 821 July 26, 821 August 1, 821 July / August
Week 31 in 821 August 2, 821 August 8, 821 August
Week 32 in 821 August 9, 821 August 15, 821 August
Week 33 in 821 August 16, 821 August 22, 821 August
Week 34 in 821 August 23, 821 August 29, 821 August
Week 35 in 821 August 30, 821 September 5, 821 August / September
Week 36 in 821 September 6, 821 September 12, 821 September
Week 37 in 821 September 13, 821 September 19, 821 September
Week 38 in 821 September 20, 821 September 26, 821 September
Week 39 in 821 September 27, 821 October 3, 821 September / October
Week 40 in 821 October 4, 821 October 10, 821 October
Week 41 in 821 October 11, 821 October 17, 821 October
Week 42 in 821 October 18, 821 October 24, 821 October
Week 43 in 821 October 25, 821 October 31, 821 October
Week 44 in 821 November 1, 821 November 7, 821 November
Week 45 in 821 November 8, 821 November 14, 821 November
Week 46 in 821 November 15, 821 November 21, 821 November
Week 47 in 821 November 22, 821 November 28, 821 November
Week 48 in 821 November 29, 821 December 5, 821 November / December
Week 49 in 821 December 6, 821 December 12, 821 December
Week 50 in 821 December 13, 821 December 19, 821 December
Week 51 in 821 December 20, 821 December 26, 821 December
Week 52 in 821 December 27, 821 January 2, 822 December / January

Calendars 821

January 821
MoTuWeThFrSaSu
Week 53123
Week 145678910
Week 211121314151617
Week 318192021222324
Week 425262728293031
February 821
MoTuWeThFrSaSu
Week 51234567
Week 6891011121314
Week 715161718192021
Week 822232425262728
March 821
MoTuWeThFrSaSu
Week 91234567
Week 10891011121314
Week 1115161718192021
Week 1222232425262728
Week 13293031
April 821
MoTuWeThFrSaSu
Week 131234
Week 14567891011
Week 1512131415161718
Week 1619202122232425
Week 172627282930
May 821
MoTuWeThFrSaSu
Week 1712
Week 183456789
Week 1910111213141516
Week 2017181920212223
Week 2124252627282930
Week 2231
June 821
MoTuWeThFrSaSu
Week 22123456
Week 2378910111213
Week 2414151617181920
Week 2521222324252627
Week 26282930
July 821
MoTuWeThFrSaSu
Week 261234
Week 27567891011
Week 2812131415161718
Week 2919202122232425
Week 30262728293031
August 821
MoTuWeThFrSaSu
Week 301
Week 312345678
Week 329101112131415
Week 3316171819202122
Week 3423242526272829
Week 353031
September 821
MoTuWeThFrSaSu
Week 3512345
Week 366789101112
Week 3713141516171819
Week 3820212223242526
Week 3927282930
October 821
MoTuWeThFrSaSu
Week 39123
Week 4045678910
Week 4111121314151617
Week 4218192021222324
Week 4325262728293031
November 821
MoTuWeThFrSaSu
Week 441234567
Week 45891011121314
Week 4615161718192021
Week 4722232425262728
Week 482930
December 821
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 821 starts on January 4, 821 and ends on January 10, 821 (ISO 8601, Monday to Sunday). 821 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 821 have?

821 has 52 ISO weeks.

When does week 1 of 821 start?

Week 1 of 821 starts on January 4, 821 and ends on January 10, 821 (ISO 8601, Monday to Sunday).

When does the last week of 821 end?

Week 52 of 821 starts on December 27, 821 and ends on January 2, 822 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 826, 832, 837, 843, 848.

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.