Week numbers 561

561 has 53 ISO weeks, because 1 January 561 falls on a Thursday. Week 1: Dec 29, 560 – Jan 4, 561 · Week 53: Dec 28, 561 – Jan 3, 562

561 at a glance

Weeks in 56153
Week 1December 29, 560 – January 4, 561
Week 53December 28, 561 – January 3, 562
Days in 561365
Leap yearNo

All Weeks in 561

Week From To Month
Week 1 in 561 December 29, 560 January 4, 561 December / January
Week 2 in 561 January 5, 561 January 11, 561 January
Week 3 in 561 January 12, 561 January 18, 561 January
Week 4 in 561 January 19, 561 January 25, 561 January
Week 5 in 561 January 26, 561 February 1, 561 January / February
Week 6 in 561 February 2, 561 February 8, 561 February
Week 7 in 561 February 9, 561 February 15, 561 February
Week 8 in 561 February 16, 561 February 22, 561 February
Week 9 in 561 February 23, 561 March 1, 561 February / March
Week 10 in 561 March 2, 561 March 8, 561 March
Week 11 in 561 March 9, 561 March 15, 561 March
Week 12 in 561 March 16, 561 March 22, 561 March
Week 13 in 561 March 23, 561 March 29, 561 March
Week 14 in 561 March 30, 561 April 5, 561 March / April
Week 15 in 561 April 6, 561 April 12, 561 April
Week 16 in 561 April 13, 561 April 19, 561 April
Week 17 in 561 April 20, 561 April 26, 561 April
Week 18 in 561 April 27, 561 May 3, 561 April / May
Week 19 in 561 May 4, 561 May 10, 561 May
Week 20 in 561 May 11, 561 May 17, 561 May
Week 21 in 561 May 18, 561 May 24, 561 May
Week 22 in 561 May 25, 561 May 31, 561 May
Week 23 in 561 June 1, 561 June 7, 561 June
Week 24 in 561 June 8, 561 June 14, 561 June
Week 25 in 561 June 15, 561 June 21, 561 June
Week 26 in 561 June 22, 561 June 28, 561 June
Week 27 in 561 June 29, 561 July 5, 561 June / July
Week 28 in 561 July 6, 561 July 12, 561 July
Week 29 in 561 July 13, 561 July 19, 561 July
Week 30 in 561 July 20, 561 July 26, 561 July
Week 31 in 561 July 27, 561 August 2, 561 July / August
Week 32 in 561 August 3, 561 August 9, 561 August
Week 33 in 561 August 10, 561 August 16, 561 August
Week 34 in 561 August 17, 561 August 23, 561 August
Week 35 in 561 August 24, 561 August 30, 561 August
Week 36 in 561 August 31, 561 September 6, 561 August / September
Week 37 in 561 September 7, 561 September 13, 561 September
Week 38 in 561 September 14, 561 September 20, 561 September
Week 39 in 561 September 21, 561 September 27, 561 September
Week 40 in 561 September 28, 561 October 4, 561 September / October
Week 41 in 561 October 5, 561 October 11, 561 October
Week 42 in 561 October 12, 561 October 18, 561 October
Week 43 in 561 October 19, 561 October 25, 561 October
Week 44 in 561 October 26, 561 November 1, 561 October / November
Week 45 in 561 November 2, 561 November 8, 561 November
Week 46 in 561 November 9, 561 November 15, 561 November
Week 47 in 561 November 16, 561 November 22, 561 November
Week 48 in 561 November 23, 561 November 29, 561 November
Week 49 in 561 November 30, 561 December 6, 561 November / December
Week 50 in 561 December 7, 561 December 13, 561 December
Week 51 in 561 December 14, 561 December 20, 561 December
Week 52 in 561 December 21, 561 December 27, 561 December
Week 53 in 561 December 28, 561 January 3, 562 December / January

Calendars 561

January 561
MoTuWeThFrSaSu
Week 11234
Week 2567891011
Week 312131415161718
Week 419202122232425
Week 5262728293031
February 561
MoTuWeThFrSaSu
Week 51
Week 62345678
Week 79101112131415
Week 816171819202122
Week 9232425262728
March 561
MoTuWeThFrSaSu
Week 91
Week 102345678
Week 119101112131415
Week 1216171819202122
Week 1323242526272829
Week 143031
April 561
MoTuWeThFrSaSu
Week 1412345
Week 156789101112
Week 1613141516171819
Week 1720212223242526
Week 1827282930
May 561
MoTuWeThFrSaSu
Week 18123
Week 1945678910
Week 2011121314151617
Week 2118192021222324
Week 2225262728293031
June 561
MoTuWeThFrSaSu
Week 231234567
Week 24891011121314
Week 2515161718192021
Week 2622232425262728
Week 272930
July 561
MoTuWeThFrSaSu
Week 2712345
Week 286789101112
Week 2913141516171819
Week 3020212223242526
Week 312728293031
August 561
MoTuWeThFrSaSu
Week 3112
Week 323456789
Week 3310111213141516
Week 3417181920212223
Week 3524252627282930
Week 3631
September 561
MoTuWeThFrSaSu
Week 36123456
Week 3778910111213
Week 3814151617181920
Week 3921222324252627
Week 40282930
October 561
MoTuWeThFrSaSu
Week 401234
Week 41567891011
Week 4212131415161718
Week 4319202122232425
Week 44262728293031
November 561
MoTuWeThFrSaSu
Week 441
Week 452345678
Week 469101112131415
Week 4716171819202122
Week 4823242526272829
Week 4930
December 561
MoTuWeThFrSaSu
Week 2123456
Week 5078910111213
Week 5114151617181920
Week 5221222324252627
Week 5328293031

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 561 starts on December 29, 560 and ends on January 4, 561 (ISO 8601, Monday to Sunday). 561 has 53 ISO weeks, because 1 January 561 falls on a Thursday.

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 561 have?

561 has 53 ISO weeks, because 1 January 561 falls on a Thursday.

When does week 1 of 561 start?

Week 1 of 561 starts on December 29, 560 and ends on January 4, 561 (ISO 8601, Monday to Sunday).

When does the last week of 561 end?

Week 53 of 561 starts on December 28, 561 and ends on January 3, 562 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 561, 567, 572, 578, 584.

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.