Week numbers 678

678 has 52 ISO weeks. Week 1: Dec 31, 677 – Jan 6, 678 · Week 52: Dec 23 – 29

678 at a glance

Weeks in 67852
Week 1December 31, 677 – January 6, 678
Week 52December 23, 678 – December 29, 678
Days in 678365
Leap yearNo

All Weeks in 678

Week From To Month
Week 1 in 678 December 31, 677 January 6, 678 December / January
Week 2 in 678 January 7, 678 January 13, 678 January
Week 3 in 678 January 14, 678 January 20, 678 January
Week 4 in 678 January 21, 678 January 27, 678 January
Week 5 in 678 January 28, 678 February 3, 678 January / February
Week 6 in 678 February 4, 678 February 10, 678 February
Week 7 in 678 February 11, 678 February 17, 678 February
Week 8 in 678 February 18, 678 February 24, 678 February
Week 9 in 678 February 25, 678 March 3, 678 February / March
Week 10 in 678 March 4, 678 March 10, 678 March
Week 11 in 678 March 11, 678 March 17, 678 March
Week 12 in 678 March 18, 678 March 24, 678 March
Week 13 in 678 March 25, 678 March 31, 678 March
Week 14 in 678 April 1, 678 April 7, 678 April
Week 15 in 678 April 8, 678 April 14, 678 April
Week 16 in 678 April 15, 678 April 21, 678 April
Week 17 in 678 April 22, 678 April 28, 678 April
Week 18 in 678 April 29, 678 May 5, 678 April / May
Week 19 in 678 May 6, 678 May 12, 678 May
Week 20 in 678 May 13, 678 May 19, 678 May
Week 21 in 678 May 20, 678 May 26, 678 May
Week 22 in 678 May 27, 678 June 2, 678 May / June
Week 23 in 678 June 3, 678 June 9, 678 June
Week 24 in 678 June 10, 678 June 16, 678 June
Week 25 in 678 June 17, 678 June 23, 678 June
Week 26 in 678 June 24, 678 June 30, 678 June
Week 27 in 678 July 1, 678 July 7, 678 July
Week 28 in 678 July 8, 678 July 14, 678 July
Week 29 in 678 July 15, 678 July 21, 678 July
Week 30 in 678 July 22, 678 July 28, 678 July
Week 31 in 678 July 29, 678 August 4, 678 July / August
Week 32 in 678 August 5, 678 August 11, 678 August
Week 33 in 678 August 12, 678 August 18, 678 August
Week 34 in 678 August 19, 678 August 25, 678 August
Week 35 in 678 August 26, 678 September 1, 678 August / September
Week 36 in 678 September 2, 678 September 8, 678 September
Week 37 in 678 September 9, 678 September 15, 678 September
Week 38 in 678 September 16, 678 September 22, 678 September
Week 39 in 678 September 23, 678 September 29, 678 September
Week 40 in 678 September 30, 678 October 6, 678 September / October
Week 41 in 678 October 7, 678 October 13, 678 October
Week 42 in 678 October 14, 678 October 20, 678 October
Week 43 in 678 October 21, 678 October 27, 678 October
Week 44 in 678 October 28, 678 November 3, 678 October / November
Week 45 in 678 November 4, 678 November 10, 678 November
Week 46 in 678 November 11, 678 November 17, 678 November
Week 47 in 678 November 18, 678 November 24, 678 November
Week 48 in 678 November 25, 678 December 1, 678 November / December
Week 49 in 678 December 2, 678 December 8, 678 December
Week 50 in 678 December 9, 678 December 15, 678 December
Week 51 in 678 December 16, 678 December 22, 678 December
Week 52 in 678 December 23, 678 December 29, 678 December

Calendars 678

January 678
MoTuWeThFrSaSu
Week 1123456
Week 278910111213
Week 314151617181920
Week 421222324252627
Week 528293031
February 678
MoTuWeThFrSaSu
Week 5123
Week 645678910
Week 711121314151617
Week 818192021222324
Week 925262728
March 678
MoTuWeThFrSaSu
Week 9123
Week 1045678910
Week 1111121314151617
Week 1218192021222324
Week 1325262728293031
April 678
MoTuWeThFrSaSu
Week 141234567
Week 15891011121314
Week 1615161718192021
Week 1722232425262728
Week 182930
May 678
MoTuWeThFrSaSu
Week 1812345
Week 196789101112
Week 2013141516171819
Week 2120212223242526
Week 222728293031
June 678
MoTuWeThFrSaSu
Week 2212
Week 233456789
Week 2410111213141516
Week 2517181920212223
Week 2624252627282930
July 678
MoTuWeThFrSaSu
Week 271234567
Week 28891011121314
Week 2915161718192021
Week 3022232425262728
Week 31293031
August 678
MoTuWeThFrSaSu
Week 311234
Week 32567891011
Week 3312131415161718
Week 3419202122232425
Week 35262728293031
September 678
MoTuWeThFrSaSu
Week 351
Week 362345678
Week 379101112131415
Week 3816171819202122
Week 3923242526272829
Week 4030
October 678
MoTuWeThFrSaSu
Week 40123456
Week 4178910111213
Week 4214151617181920
Week 4321222324252627
Week 4428293031
November 678
MoTuWeThFrSaSu
Week 44123
Week 4545678910
Week 4611121314151617
Week 4718192021222324
Week 48252627282930
December 678
MoTuWeThFrSaSu
Week 21
Week 492345678
Week 509101112131415
Week 5116171819202122
Week 5223242526272829
Week 13031

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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 678 starts on December 31, 677 and ends on January 6, 678 (ISO 8601, Monday to Sunday). 678 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 678 have?

678 has 52 ISO weeks.

When does week 1 of 678 start?

Week 1 of 678 starts on December 31, 677 and ends on January 6, 678 (ISO 8601, Monday to Sunday).

When does the last week of 678 end?

Week 52 of 678 starts on December 23, 678 and ends on December 29, 678 (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.