Week numbers 840

840 has 52 ISO weeks. Week 1: Jan 2 – 8 · Week 52: Dec 24 – 30

840 at a glance

Weeks in 84052
Week 1January 2, 840 – January 8, 840
Week 52December 24, 840 – December 30, 840
Days in 840366
Leap yearYes

All Weeks in 840

Week From To Month
Week 1 in 840 January 2, 840 January 8, 840 January
Week 2 in 840 January 9, 840 January 15, 840 January
Week 3 in 840 January 16, 840 January 22, 840 January
Week 4 in 840 January 23, 840 January 29, 840 January
Week 5 in 840 January 30, 840 February 5, 840 January / February
Week 6 in 840 February 6, 840 February 12, 840 February
Week 7 in 840 February 13, 840 February 19, 840 February
Week 8 in 840 February 20, 840 February 26, 840 February
Week 9 in 840 February 27, 840 March 4, 840 February / March
Week 10 in 840 March 5, 840 March 11, 840 March
Week 11 in 840 March 12, 840 March 18, 840 March
Week 12 in 840 March 19, 840 March 25, 840 March
Week 13 in 840 March 26, 840 April 1, 840 March / April
Week 14 in 840 April 2, 840 April 8, 840 April
Week 15 in 840 April 9, 840 April 15, 840 April
Week 16 in 840 April 16, 840 April 22, 840 April
Week 17 in 840 April 23, 840 April 29, 840 April
Week 18 in 840 April 30, 840 May 6, 840 April / May
Week 19 in 840 May 7, 840 May 13, 840 May
Week 20 in 840 May 14, 840 May 20, 840 May
Week 21 in 840 May 21, 840 May 27, 840 May
Week 22 in 840 May 28, 840 June 3, 840 May / June
Week 23 in 840 June 4, 840 June 10, 840 June
Week 24 in 840 June 11, 840 June 17, 840 June
Week 25 in 840 June 18, 840 June 24, 840 June
Week 26 in 840 June 25, 840 July 1, 840 June / July
Week 27 in 840 July 2, 840 July 8, 840 July
Week 28 in 840 July 9, 840 July 15, 840 July
Week 29 in 840 July 16, 840 July 22, 840 July
Week 30 in 840 July 23, 840 July 29, 840 July
Week 31 in 840 July 30, 840 August 5, 840 July / August
Week 32 in 840 August 6, 840 August 12, 840 August
Week 33 in 840 August 13, 840 August 19, 840 August
Week 34 in 840 August 20, 840 August 26, 840 August
Week 35 in 840 August 27, 840 September 2, 840 August / September
Week 36 in 840 September 3, 840 September 9, 840 September
Week 37 in 840 September 10, 840 September 16, 840 September
Week 38 in 840 September 17, 840 September 23, 840 September
Week 39 in 840 September 24, 840 September 30, 840 September
Week 40 in 840 October 1, 840 October 7, 840 October
Week 41 in 840 October 8, 840 October 14, 840 October
Week 42 in 840 October 15, 840 October 21, 840 October
Week 43 in 840 October 22, 840 October 28, 840 October
Week 44 in 840 October 29, 840 November 4, 840 October / November
Week 45 in 840 November 5, 840 November 11, 840 November
Week 46 in 840 November 12, 840 November 18, 840 November
Week 47 in 840 November 19, 840 November 25, 840 November
Week 48 in 840 November 26, 840 December 2, 840 November / December
Week 49 in 840 December 3, 840 December 9, 840 December
Week 50 in 840 December 10, 840 December 16, 840 December
Week 51 in 840 December 17, 840 December 23, 840 December
Week 52 in 840 December 24, 840 December 30, 840 December

Calendars 840

January 840
MoTuWeThFrSaSu
Week 521
Week 12345678
Week 29101112131415
Week 316171819202122
Week 423242526272829
Week 53031
February 840
MoTuWeThFrSaSu
Week 512345
Week 66789101112
Week 713141516171819
Week 820212223242526
Week 9272829
March 840
MoTuWeThFrSaSu
Week 91234
Week 10567891011
Week 1112131415161718
Week 1219202122232425
Week 13262728293031
April 840
MoTuWeThFrSaSu
Week 131
Week 142345678
Week 159101112131415
Week 1616171819202122
Week 1723242526272829
Week 1830
May 840
MoTuWeThFrSaSu
Week 18123456
Week 1978910111213
Week 2014151617181920
Week 2121222324252627
Week 2228293031
June 840
MoTuWeThFrSaSu
Week 22123
Week 2345678910
Week 2411121314151617
Week 2518192021222324
Week 26252627282930
July 840
MoTuWeThFrSaSu
Week 261
Week 272345678
Week 289101112131415
Week 2916171819202122
Week 3023242526272829
Week 313031
August 840
MoTuWeThFrSaSu
Week 3112345
Week 326789101112
Week 3313141516171819
Week 3420212223242526
Week 352728293031
September 840
MoTuWeThFrSaSu
Week 3512
Week 363456789
Week 3710111213141516
Week 3817181920212223
Week 3924252627282930
October 840
MoTuWeThFrSaSu
Week 401234567
Week 41891011121314
Week 4215161718192021
Week 4322232425262728
Week 44293031
November 840
MoTuWeThFrSaSu
Week 441234
Week 45567891011
Week 4612131415161718
Week 4719202122232425
Week 482627282930
December 840
MoTuWeThFrSaSu
Week 112
Week 493456789
Week 5010111213141516
Week 5117181920212223
Week 5224252627282930
Week 131

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 840 starts on January 2, 840 and ends on January 8, 840 (ISO 8601, Monday to Sunday). 840 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 840 have?

840 has 52 ISO weeks.

When does week 1 of 840 start?

Week 1 of 840 starts on January 2, 840 and ends on January 8, 840 (ISO 8601, Monday to Sunday).

When does the last week of 840 end?

Week 52 of 840 starts on December 24, 840 and ends on December 30, 840 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 843, 848, 854, 860, 865.

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.