Week numbers 680

680 has 53 ISO weeks, because 1 January 680 falls on a Thursday. Week 1: Dec 29, 679 – Jan 4, 680 · Week 53: Dec 27, 680 – Jan 2, 681

680 at a glance

Weeks in 68053
Week 1December 29, 679 – January 4, 680
Week 53December 27, 680 – January 2, 681
Days in 680366
Leap yearYes

All Weeks in 680

Week From To Month
Week 1 in 680 December 29, 679 January 4, 680 December / January
Week 2 in 680 January 5, 680 January 11, 680 January
Week 3 in 680 January 12, 680 January 18, 680 January
Week 4 in 680 January 19, 680 January 25, 680 January
Week 5 in 680 January 26, 680 February 1, 680 January / February
Week 6 in 680 February 2, 680 February 8, 680 February
Week 7 in 680 February 9, 680 February 15, 680 February
Week 8 in 680 February 16, 680 February 22, 680 February
Week 9 in 680 February 23, 680 February 29, 680 February
Week 10 in 680 March 1, 680 March 7, 680 March
Week 11 in 680 March 8, 680 March 14, 680 March
Week 12 in 680 March 15, 680 March 21, 680 March
Week 13 in 680 March 22, 680 March 28, 680 March
Week 14 in 680 March 29, 680 April 4, 680 March / April
Week 15 in 680 April 5, 680 April 11, 680 April
Week 16 in 680 April 12, 680 April 18, 680 April
Week 17 in 680 April 19, 680 April 25, 680 April
Week 18 in 680 April 26, 680 May 2, 680 April / May
Week 19 in 680 May 3, 680 May 9, 680 May
Week 20 in 680 May 10, 680 May 16, 680 May
Week 21 in 680 May 17, 680 May 23, 680 May
Week 22 in 680 May 24, 680 May 30, 680 May
Week 23 in 680 May 31, 680 June 6, 680 May / June
Week 24 in 680 June 7, 680 June 13, 680 June
Week 25 in 680 June 14, 680 June 20, 680 June
Week 26 in 680 June 21, 680 June 27, 680 June
Week 27 in 680 June 28, 680 July 4, 680 June / July
Week 28 in 680 July 5, 680 July 11, 680 July
Week 29 in 680 July 12, 680 July 18, 680 July
Week 30 in 680 July 19, 680 July 25, 680 July
Week 31 in 680 July 26, 680 August 1, 680 July / August
Week 32 in 680 August 2, 680 August 8, 680 August
Week 33 in 680 August 9, 680 August 15, 680 August
Week 34 in 680 August 16, 680 August 22, 680 August
Week 35 in 680 August 23, 680 August 29, 680 August
Week 36 in 680 August 30, 680 September 5, 680 August / September
Week 37 in 680 September 6, 680 September 12, 680 September
Week 38 in 680 September 13, 680 September 19, 680 September
Week 39 in 680 September 20, 680 September 26, 680 September
Week 40 in 680 September 27, 680 October 3, 680 September / October
Week 41 in 680 October 4, 680 October 10, 680 October
Week 42 in 680 October 11, 680 October 17, 680 October
Week 43 in 680 October 18, 680 October 24, 680 October
Week 44 in 680 October 25, 680 October 31, 680 October
Week 45 in 680 November 1, 680 November 7, 680 November
Week 46 in 680 November 8, 680 November 14, 680 November
Week 47 in 680 November 15, 680 November 21, 680 November
Week 48 in 680 November 22, 680 November 28, 680 November
Week 49 in 680 November 29, 680 December 5, 680 November / December
Week 50 in 680 December 6, 680 December 12, 680 December
Week 51 in 680 December 13, 680 December 19, 680 December
Week 52 in 680 December 20, 680 December 26, 680 December
Week 53 in 680 December 27, 680 January 2, 681 December / January

Calendars 680

January 680
MoTuWeThFrSaSu
Week 11234
Week 2567891011
Week 312131415161718
Week 419202122232425
Week 5262728293031
February 680
MoTuWeThFrSaSu
Week 51
Week 62345678
Week 79101112131415
Week 816171819202122
Week 923242526272829
March 680
MoTuWeThFrSaSu
Week 101234567
Week 11891011121314
Week 1215161718192021
Week 1322232425262728
Week 14293031
April 680
MoTuWeThFrSaSu
Week 141234
Week 15567891011
Week 1612131415161718
Week 1719202122232425
Week 182627282930
May 680
MoTuWeThFrSaSu
Week 1812
Week 193456789
Week 2010111213141516
Week 2117181920212223
Week 2224252627282930
Week 2331
June 680
MoTuWeThFrSaSu
Week 23123456
Week 2478910111213
Week 2514151617181920
Week 2621222324252627
Week 27282930
July 680
MoTuWeThFrSaSu
Week 271234
Week 28567891011
Week 2912131415161718
Week 3019202122232425
Week 31262728293031
August 680
MoTuWeThFrSaSu
Week 311
Week 322345678
Week 339101112131415
Week 3416171819202122
Week 3523242526272829
Week 363031
September 680
MoTuWeThFrSaSu
Week 3612345
Week 376789101112
Week 3813141516171819
Week 3920212223242526
Week 4027282930
October 680
MoTuWeThFrSaSu
Week 40123
Week 4145678910
Week 4211121314151617
Week 4318192021222324
Week 4425262728293031
November 680
MoTuWeThFrSaSu
Week 451234567
Week 46891011121314
Week 4715161718192021
Week 4822232425262728
Week 492930
December 680
MoTuWeThFrSaSu
Week 212345
Week 506789101112
Week 5113141516171819
Week 5220212223242526
Week 532728293031

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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 680 starts on December 29, 679 and ends on January 4, 680 (ISO 8601, Monday to Sunday). 680 has 53 ISO weeks, because 1 January 680 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 680 have?

680 has 53 ISO weeks, because 1 January 680 falls on a Thursday.

When does week 1 of 680 start?

Week 1 of 680 starts on December 29, 679 and ends on January 4, 680 (ISO 8601, Monday to Sunday).

When does the last week of 680 end?

Week 53 of 680 starts on December 27, 680 and ends on January 2, 681 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 680, 685, 691, 696, 703.

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.