Week numbers 580

580 has 52 ISO weeks. Week 1: Jan 3 – 9 · Week 52: Dec 25 – 31

580 at a glance

Weeks in 58052
Week 1January 3, 580 – January 9, 580
Week 52December 25, 580 – December 31, 580
Days in 580366
Leap yearYes

All Weeks in 580

Week From To Month
Week 1 in 580 January 3, 580 January 9, 580 January
Week 2 in 580 January 10, 580 January 16, 580 January
Week 3 in 580 January 17, 580 January 23, 580 January
Week 4 in 580 January 24, 580 January 30, 580 January
Week 5 in 580 January 31, 580 February 6, 580 January / February
Week 6 in 580 February 7, 580 February 13, 580 February
Week 7 in 580 February 14, 580 February 20, 580 February
Week 8 in 580 February 21, 580 February 27, 580 February
Week 9 in 580 February 28, 580 March 5, 580 February / March
Week 10 in 580 March 6, 580 March 12, 580 March
Week 11 in 580 March 13, 580 March 19, 580 March
Week 12 in 580 March 20, 580 March 26, 580 March
Week 13 in 580 March 27, 580 April 2, 580 March / April
Week 14 in 580 April 3, 580 April 9, 580 April
Week 15 in 580 April 10, 580 April 16, 580 April
Week 16 in 580 April 17, 580 April 23, 580 April
Week 17 in 580 April 24, 580 April 30, 580 April
Week 18 in 580 May 1, 580 May 7, 580 May
Week 19 in 580 May 8, 580 May 14, 580 May
Week 20 in 580 May 15, 580 May 21, 580 May
Week 21 in 580 May 22, 580 May 28, 580 May
Week 22 in 580 May 29, 580 June 4, 580 May / June
Week 23 in 580 June 5, 580 June 11, 580 June
Week 24 in 580 June 12, 580 June 18, 580 June
Week 25 in 580 June 19, 580 June 25, 580 June
Week 26 in 580 June 26, 580 July 2, 580 June / July
Week 27 in 580 July 3, 580 July 9, 580 July
Week 28 in 580 July 10, 580 July 16, 580 July
Week 29 in 580 July 17, 580 July 23, 580 July
Week 30 in 580 July 24, 580 July 30, 580 July
Week 31 in 580 July 31, 580 August 6, 580 July / August
Week 32 in 580 August 7, 580 August 13, 580 August
Week 33 in 580 August 14, 580 August 20, 580 August
Week 34 in 580 August 21, 580 August 27, 580 August
Week 35 in 580 August 28, 580 September 3, 580 August / September
Week 36 in 580 September 4, 580 September 10, 580 September
Week 37 in 580 September 11, 580 September 17, 580 September
Week 38 in 580 September 18, 580 September 24, 580 September
Week 39 in 580 September 25, 580 October 1, 580 September / October
Week 40 in 580 October 2, 580 October 8, 580 October
Week 41 in 580 October 9, 580 October 15, 580 October
Week 42 in 580 October 16, 580 October 22, 580 October
Week 43 in 580 October 23, 580 October 29, 580 October
Week 44 in 580 October 30, 580 November 5, 580 October / November
Week 45 in 580 November 6, 580 November 12, 580 November
Week 46 in 580 November 13, 580 November 19, 580 November
Week 47 in 580 November 20, 580 November 26, 580 November
Week 48 in 580 November 27, 580 December 3, 580 November / December
Week 49 in 580 December 4, 580 December 10, 580 December
Week 50 in 580 December 11, 580 December 17, 580 December
Week 51 in 580 December 18, 580 December 24, 580 December
Week 52 in 580 December 25, 580 December 31, 580 December

Calendars 580

January 580
MoTuWeThFrSaSu
Week 5212
Week 13456789
Week 210111213141516
Week 317181920212223
Week 424252627282930
Week 531
February 580
MoTuWeThFrSaSu
Week 5123456
Week 678910111213
Week 714151617181920
Week 821222324252627
Week 92829
March 580
MoTuWeThFrSaSu
Week 912345
Week 106789101112
Week 1113141516171819
Week 1220212223242526
Week 132728293031
April 580
MoTuWeThFrSaSu
Week 1312
Week 143456789
Week 1510111213141516
Week 1617181920212223
Week 1724252627282930
May 580
MoTuWeThFrSaSu
Week 181234567
Week 19891011121314
Week 2015161718192021
Week 2122232425262728
Week 22293031
June 580
MoTuWeThFrSaSu
Week 221234
Week 23567891011
Week 2412131415161718
Week 2519202122232425
Week 262627282930
July 580
MoTuWeThFrSaSu
Week 2612
Week 273456789
Week 2810111213141516
Week 2917181920212223
Week 3024252627282930
Week 3131
August 580
MoTuWeThFrSaSu
Week 31123456
Week 3278910111213
Week 3314151617181920
Week 3421222324252627
Week 3528293031
September 580
MoTuWeThFrSaSu
Week 35123
Week 3645678910
Week 3711121314151617
Week 3818192021222324
Week 39252627282930
October 580
MoTuWeThFrSaSu
Week 391
Week 402345678
Week 419101112131415
Week 4216171819202122
Week 4323242526272829
Week 443031
November 580
MoTuWeThFrSaSu
Week 4412345
Week 456789101112
Week 4613141516171819
Week 4720212223242526
Week 4827282930
December 580
MoTuWeThFrSaSu
Week 1123
Week 4945678910
Week 5011121314151617
Week 5118192021222324
Week 5225262728293031

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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 580 starts on January 3, 580 and ends on January 9, 580 (ISO 8601, Monday to Sunday). 580 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 580 have?

580 has 52 ISO weeks.

When does week 1 of 580 start?

Week 1 of 580 starts on January 3, 580 and ends on January 9, 580 (ISO 8601, Monday to Sunday).

When does the last week of 580 end?

Week 52 of 580 starts on December 25, 580 and ends on December 31, 580 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 584, 589, 595, 601, 607.

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.