Week numbers 670

670 has 52 ISO weeks. Week 1: Jan 3 – 9 · Week 52: Dec 26, 670 – Jan 1, 671

670 at a glance

Weeks in 67052
Week 1January 3, 670 – January 9, 670
Week 52December 26, 670 – January 1, 671
Days in 670365
Leap yearNo

All Weeks in 670

Week From To Month
Week 1 in 670 January 3, 670 January 9, 670 January
Week 2 in 670 January 10, 670 January 16, 670 January
Week 3 in 670 January 17, 670 January 23, 670 January
Week 4 in 670 January 24, 670 January 30, 670 January
Week 5 in 670 January 31, 670 February 6, 670 January / February
Week 6 in 670 February 7, 670 February 13, 670 February
Week 7 in 670 February 14, 670 February 20, 670 February
Week 8 in 670 February 21, 670 February 27, 670 February
Week 9 in 670 February 28, 670 March 6, 670 February / March
Week 10 in 670 March 7, 670 March 13, 670 March
Week 11 in 670 March 14, 670 March 20, 670 March
Week 12 in 670 March 21, 670 March 27, 670 March
Week 13 in 670 March 28, 670 April 3, 670 March / April
Week 14 in 670 April 4, 670 April 10, 670 April
Week 15 in 670 April 11, 670 April 17, 670 April
Week 16 in 670 April 18, 670 April 24, 670 April
Week 17 in 670 April 25, 670 May 1, 670 April / May
Week 18 in 670 May 2, 670 May 8, 670 May
Week 19 in 670 May 9, 670 May 15, 670 May
Week 20 in 670 May 16, 670 May 22, 670 May
Week 21 in 670 May 23, 670 May 29, 670 May
Week 22 in 670 May 30, 670 June 5, 670 May / June
Week 23 in 670 June 6, 670 June 12, 670 June
Week 24 in 670 June 13, 670 June 19, 670 June
Week 25 in 670 June 20, 670 June 26, 670 June
Week 26 in 670 June 27, 670 July 3, 670 June / July
Week 27 in 670 July 4, 670 July 10, 670 July
Week 28 in 670 July 11, 670 July 17, 670 July
Week 29 in 670 July 18, 670 July 24, 670 July
Week 30 in 670 July 25, 670 July 31, 670 July
Week 31 in 670 August 1, 670 August 7, 670 August
Week 32 in 670 August 8, 670 August 14, 670 August
Week 33 in 670 August 15, 670 August 21, 670 August
Week 34 in 670 August 22, 670 August 28, 670 August
Week 35 in 670 August 29, 670 September 4, 670 August / September
Week 36 in 670 September 5, 670 September 11, 670 September
Week 37 in 670 September 12, 670 September 18, 670 September
Week 38 in 670 September 19, 670 September 25, 670 September
Week 39 in 670 September 26, 670 October 2, 670 September / October
Week 40 in 670 October 3, 670 October 9, 670 October
Week 41 in 670 October 10, 670 October 16, 670 October
Week 42 in 670 October 17, 670 October 23, 670 October
Week 43 in 670 October 24, 670 October 30, 670 October
Week 44 in 670 October 31, 670 November 6, 670 October / November
Week 45 in 670 November 7, 670 November 13, 670 November
Week 46 in 670 November 14, 670 November 20, 670 November
Week 47 in 670 November 21, 670 November 27, 670 November
Week 48 in 670 November 28, 670 December 4, 670 November / December
Week 49 in 670 December 5, 670 December 11, 670 December
Week 50 in 670 December 12, 670 December 18, 670 December
Week 51 in 670 December 19, 670 December 25, 670 December
Week 52 in 670 December 26, 670 January 1, 671 December / January

Calendars 670

January 670
MoTuWeThFrSaSu
Week 5212
Week 13456789
Week 210111213141516
Week 317181920212223
Week 424252627282930
Week 531
February 670
MoTuWeThFrSaSu
Week 5123456
Week 678910111213
Week 714151617181920
Week 821222324252627
Week 928
March 670
MoTuWeThFrSaSu
Week 9123456
Week 1078910111213
Week 1114151617181920
Week 1221222324252627
Week 1328293031
April 670
MoTuWeThFrSaSu
Week 13123
Week 1445678910
Week 1511121314151617
Week 1618192021222324
Week 17252627282930
May 670
MoTuWeThFrSaSu
Week 171
Week 182345678
Week 199101112131415
Week 2016171819202122
Week 2123242526272829
Week 223031
June 670
MoTuWeThFrSaSu
Week 2212345
Week 236789101112
Week 2413141516171819
Week 2520212223242526
Week 2627282930
July 670
MoTuWeThFrSaSu
Week 26123
Week 2745678910
Week 2811121314151617
Week 2918192021222324
Week 3025262728293031
August 670
MoTuWeThFrSaSu
Week 311234567
Week 32891011121314
Week 3315161718192021
Week 3422232425262728
Week 35293031
September 670
MoTuWeThFrSaSu
Week 351234
Week 36567891011
Week 3712131415161718
Week 3819202122232425
Week 392627282930
October 670
MoTuWeThFrSaSu
Week 3912
Week 403456789
Week 4110111213141516
Week 4217181920212223
Week 4324252627282930
Week 4431
November 670
MoTuWeThFrSaSu
Week 44123456
Week 4578910111213
Week 4614151617181920
Week 4721222324252627
Week 48282930
December 670
MoTuWeThFrSaSu
Week 11234
Week 49567891011
Week 5012131415161718
Week 5119202122232425
Week 52262728293031

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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 670 starts on January 3, 670 and ends on January 9, 670 (ISO 8601, Monday to Sunday). 670 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 670 have?

670 has 52 ISO weeks.

When does week 1 of 670 start?

Week 1 of 670 starts on January 3, 670 and ends on January 9, 670 (ISO 8601, Monday to Sunday).

When does the last week of 670 end?

Week 52 of 670 starts on December 26, 670 and ends on January 1, 671 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 674, 680, 685, 691, 696.

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.