Week numbers 669

669 has 52 ISO weeks. Week 1: Jan 4 – 10 · Week 52: Dec 27, 669 – Jan 2, 670

669 at a glance

Weeks in 66952
Week 1January 4, 669 – January 10, 669
Week 52December 27, 669 – January 2, 670
Days in 669365
Leap yearNo

All Weeks in 669

Week From To Month
Week 1 in 669 January 4, 669 January 10, 669 January
Week 2 in 669 January 11, 669 January 17, 669 January
Week 3 in 669 January 18, 669 January 24, 669 January
Week 4 in 669 January 25, 669 January 31, 669 January
Week 5 in 669 February 1, 669 February 7, 669 February
Week 6 in 669 February 8, 669 February 14, 669 February
Week 7 in 669 February 15, 669 February 21, 669 February
Week 8 in 669 February 22, 669 February 28, 669 February
Week 9 in 669 March 1, 669 March 7, 669 March
Week 10 in 669 March 8, 669 March 14, 669 March
Week 11 in 669 March 15, 669 March 21, 669 March
Week 12 in 669 March 22, 669 March 28, 669 March
Week 13 in 669 March 29, 669 April 4, 669 March / April
Week 14 in 669 April 5, 669 April 11, 669 April
Week 15 in 669 April 12, 669 April 18, 669 April
Week 16 in 669 April 19, 669 April 25, 669 April
Week 17 in 669 April 26, 669 May 2, 669 April / May
Week 18 in 669 May 3, 669 May 9, 669 May
Week 19 in 669 May 10, 669 May 16, 669 May
Week 20 in 669 May 17, 669 May 23, 669 May
Week 21 in 669 May 24, 669 May 30, 669 May
Week 22 in 669 May 31, 669 June 6, 669 May / June
Week 23 in 669 June 7, 669 June 13, 669 June
Week 24 in 669 June 14, 669 June 20, 669 June
Week 25 in 669 June 21, 669 June 27, 669 June
Week 26 in 669 June 28, 669 July 4, 669 June / July
Week 27 in 669 July 5, 669 July 11, 669 July
Week 28 in 669 July 12, 669 July 18, 669 July
Week 29 in 669 July 19, 669 July 25, 669 July
Week 30 in 669 July 26, 669 August 1, 669 July / August
Week 31 in 669 August 2, 669 August 8, 669 August
Week 32 in 669 August 9, 669 August 15, 669 August
Week 33 in 669 August 16, 669 August 22, 669 August
Week 34 in 669 August 23, 669 August 29, 669 August
Week 35 in 669 August 30, 669 September 5, 669 August / September
Week 36 in 669 September 6, 669 September 12, 669 September
Week 37 in 669 September 13, 669 September 19, 669 September
Week 38 in 669 September 20, 669 September 26, 669 September
Week 39 in 669 September 27, 669 October 3, 669 September / October
Week 40 in 669 October 4, 669 October 10, 669 October
Week 41 in 669 October 11, 669 October 17, 669 October
Week 42 in 669 October 18, 669 October 24, 669 October
Week 43 in 669 October 25, 669 October 31, 669 October
Week 44 in 669 November 1, 669 November 7, 669 November
Week 45 in 669 November 8, 669 November 14, 669 November
Week 46 in 669 November 15, 669 November 21, 669 November
Week 47 in 669 November 22, 669 November 28, 669 November
Week 48 in 669 November 29, 669 December 5, 669 November / December
Week 49 in 669 December 6, 669 December 12, 669 December
Week 50 in 669 December 13, 669 December 19, 669 December
Week 51 in 669 December 20, 669 December 26, 669 December
Week 52 in 669 December 27, 669 January 2, 670 December / January

Calendars 669

January 669
MoTuWeThFrSaSu
Week 53123
Week 145678910
Week 211121314151617
Week 318192021222324
Week 425262728293031
February 669
MoTuWeThFrSaSu
Week 51234567
Week 6891011121314
Week 715161718192021
Week 822232425262728
March 669
MoTuWeThFrSaSu
Week 91234567
Week 10891011121314
Week 1115161718192021
Week 1222232425262728
Week 13293031
April 669
MoTuWeThFrSaSu
Week 131234
Week 14567891011
Week 1512131415161718
Week 1619202122232425
Week 172627282930
May 669
MoTuWeThFrSaSu
Week 1712
Week 183456789
Week 1910111213141516
Week 2017181920212223
Week 2124252627282930
Week 2231
June 669
MoTuWeThFrSaSu
Week 22123456
Week 2378910111213
Week 2414151617181920
Week 2521222324252627
Week 26282930
July 669
MoTuWeThFrSaSu
Week 261234
Week 27567891011
Week 2812131415161718
Week 2919202122232425
Week 30262728293031
August 669
MoTuWeThFrSaSu
Week 301
Week 312345678
Week 329101112131415
Week 3316171819202122
Week 3423242526272829
Week 353031
September 669
MoTuWeThFrSaSu
Week 3512345
Week 366789101112
Week 3713141516171819
Week 3820212223242526
Week 3927282930
October 669
MoTuWeThFrSaSu
Week 39123
Week 4045678910
Week 4111121314151617
Week 4218192021222324
Week 4325262728293031
November 669
MoTuWeThFrSaSu
Week 441234567
Week 45891011121314
Week 4615161718192021
Week 4722232425262728
Week 482930
December 669
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 669 starts on January 4, 669 and ends on January 10, 669 (ISO 8601, Monday to Sunday). 669 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 669 have?

669 has 52 ISO weeks.

When does week 1 of 669 start?

Week 1 of 669 starts on January 4, 669 and ends on January 10, 669 (ISO 8601, Monday to Sunday).

When does the last week of 669 end?

Week 52 of 669 starts on December 27, 669 and ends on January 2, 670 (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.