Week numbers 8780

8780 has 52 ISO weeks. Week 1: Dec 31, 8779 – Jan 6, 8780 · Week 52: Dec 22 – 28

8780 at a glance

Weeks in 878052
Week 1December 31, 8779 – January 6, 8780
Week 52December 22, 8780 – December 28, 8780
Days in 8780366
Leap yearYes

All Weeks in 8780

Week From To Month
Week 1 in 8780 December 31, 8779 January 6, 8780 December / January
Week 2 in 8780 January 7, 8780 January 13, 8780 January
Week 3 in 8780 January 14, 8780 January 20, 8780 January
Week 4 in 8780 January 21, 8780 January 27, 8780 January
Week 5 in 8780 January 28, 8780 February 3, 8780 January / February
Week 6 in 8780 February 4, 8780 February 10, 8780 February
Week 7 in 8780 February 11, 8780 February 17, 8780 February
Week 8 in 8780 February 18, 8780 February 24, 8780 February
Week 9 in 8780 February 25, 8780 March 2, 8780 February / March
Week 10 in 8780 March 3, 8780 March 9, 8780 March
Week 11 in 8780 March 10, 8780 March 16, 8780 March
Week 12 in 8780 March 17, 8780 March 23, 8780 March
Week 13 in 8780 March 24, 8780 March 30, 8780 March
Week 14 in 8780 March 31, 8780 April 6, 8780 March / April
Week 15 in 8780 April 7, 8780 April 13, 8780 April
Week 16 in 8780 April 14, 8780 April 20, 8780 April
Week 17 in 8780 April 21, 8780 April 27, 8780 April
Week 18 in 8780 April 28, 8780 May 4, 8780 April / May
Week 19 in 8780 May 5, 8780 May 11, 8780 May
Week 20 in 8780 May 12, 8780 May 18, 8780 May
Week 21 in 8780 May 19, 8780 May 25, 8780 May
Week 22 in 8780 May 26, 8780 June 1, 8780 May / June
Week 23 in 8780 June 2, 8780 June 8, 8780 June
Week 24 in 8780 June 9, 8780 June 15, 8780 June
Week 25 in 8780 June 16, 8780 June 22, 8780 June
Week 26 in 8780 June 23, 8780 June 29, 8780 June
Week 27 in 8780 June 30, 8780 July 6, 8780 June / July
Week 28 in 8780 July 7, 8780 July 13, 8780 July
Week 29 in 8780 July 14, 8780 July 20, 8780 July
Week 30 in 8780 July 21, 8780 July 27, 8780 July
Week 31 in 8780 July 28, 8780 August 3, 8780 July / August
Week 32 in 8780 August 4, 8780 August 10, 8780 August
Week 33 in 8780 August 11, 8780 August 17, 8780 August
Week 34 in 8780 August 18, 8780 August 24, 8780 August
Week 35 in 8780 August 25, 8780 August 31, 8780 August
Week 36 in 8780 September 1, 8780 September 7, 8780 September
Week 37 in 8780 September 8, 8780 September 14, 8780 September
Week 38 in 8780 September 15, 8780 September 21, 8780 September
Week 39 in 8780 September 22, 8780 September 28, 8780 September
Week 40 in 8780 September 29, 8780 October 5, 8780 September / October
Week 41 in 8780 October 6, 8780 October 12, 8780 October
Week 42 in 8780 October 13, 8780 October 19, 8780 October
Week 43 in 8780 October 20, 8780 October 26, 8780 October
Week 44 in 8780 October 27, 8780 November 2, 8780 October / November
Week 45 in 8780 November 3, 8780 November 9, 8780 November
Week 46 in 8780 November 10, 8780 November 16, 8780 November
Week 47 in 8780 November 17, 8780 November 23, 8780 November
Week 48 in 8780 November 24, 8780 November 30, 8780 November
Week 49 in 8780 December 1, 8780 December 7, 8780 December
Week 50 in 8780 December 8, 8780 December 14, 8780 December
Week 51 in 8780 December 15, 8780 December 21, 8780 December
Week 52 in 8780 December 22, 8780 December 28, 8780 December

Calendars 8780

January 8780
MoTuWeThFrSaSu
Week 1123456
Week 278910111213
Week 314151617181920
Week 421222324252627
Week 528293031
February 8780
MoTuWeThFrSaSu
Week 5123
Week 645678910
Week 711121314151617
Week 818192021222324
Week 92526272829
March 8780
MoTuWeThFrSaSu
Week 912
Week 103456789
Week 1110111213141516
Week 1217181920212223
Week 1324252627282930
Week 1431
April 8780
MoTuWeThFrSaSu
Week 14123456
Week 1578910111213
Week 1614151617181920
Week 1721222324252627
Week 18282930
May 8780
MoTuWeThFrSaSu
Week 181234
Week 19567891011
Week 2012131415161718
Week 2119202122232425
Week 22262728293031
June 8780
MoTuWeThFrSaSu
Week 221
Week 232345678
Week 249101112131415
Week 2516171819202122
Week 2623242526272829
Week 2730
July 8780
MoTuWeThFrSaSu
Week 27123456
Week 2878910111213
Week 2914151617181920
Week 3021222324252627
Week 3128293031
August 8780
MoTuWeThFrSaSu
Week 31123
Week 3245678910
Week 3311121314151617
Week 3418192021222324
Week 3525262728293031
September 8780
MoTuWeThFrSaSu
Week 361234567
Week 37891011121314
Week 3815161718192021
Week 3922232425262728
Week 402930
October 8780
MoTuWeThFrSaSu
Week 4012345
Week 416789101112
Week 4213141516171819
Week 4320212223242526
Week 442728293031
November 8780
MoTuWeThFrSaSu
Week 4412
Week 453456789
Week 4610111213141516
Week 4717181920212223
Week 4824252627282930
December 8780
MoTuWeThFrSaSu
Week 491234567
Week 50891011121314
Week 5115161718192021
Week 5222232425262728
Week 1293031

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 8780 starts on December 31, 8779 and ends on January 6, 8780 (ISO 8601, Monday to Sunday). 8780 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 8780 have?

8780 has 52 ISO weeks.

When does week 1 of 8780 start?

Week 1 of 8780 starts on December 31, 8779 and ends on January 6, 8780 (ISO 8601, Monday to Sunday).

When does the last week of 8780 end?

Week 52 of 8780 starts on December 22, 8780 and ends on December 28, 8780 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 8781, 8787, 8792, 8798, 8804.

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.