Week numbers 549

549 has 52 ISO weeks. Week 1: Dec 30, 548 – Jan 5, 549 · Week 52: Dec 22 – 28

549 at a glance

Weeks in 54952
Week 1December 30, 548 – January 5, 549
Week 52December 22, 549 – December 28, 549
Days in 549365
Leap yearNo

All Weeks in 549

Week From To Month
Week 1 in 549 December 30, 548 January 5, 549 December / January
Week 2 in 549 January 6, 549 January 12, 549 January
Week 3 in 549 January 13, 549 January 19, 549 January
Week 4 in 549 January 20, 549 January 26, 549 January
Week 5 in 549 January 27, 549 February 2, 549 January / February
Week 6 in 549 February 3, 549 February 9, 549 February
Week 7 in 549 February 10, 549 February 16, 549 February
Week 8 in 549 February 17, 549 February 23, 549 February
Week 9 in 549 February 24, 549 March 2, 549 February / March
Week 10 in 549 March 3, 549 March 9, 549 March
Week 11 in 549 March 10, 549 March 16, 549 March
Week 12 in 549 March 17, 549 March 23, 549 March
Week 13 in 549 March 24, 549 March 30, 549 March
Week 14 in 549 March 31, 549 April 6, 549 March / April
Week 15 in 549 April 7, 549 April 13, 549 April
Week 16 in 549 April 14, 549 April 20, 549 April
Week 17 in 549 April 21, 549 April 27, 549 April
Week 18 in 549 April 28, 549 May 4, 549 April / May
Week 19 in 549 May 5, 549 May 11, 549 May
Week 20 in 549 May 12, 549 May 18, 549 May
Week 21 in 549 May 19, 549 May 25, 549 May
Week 22 in 549 May 26, 549 June 1, 549 May / June
Week 23 in 549 June 2, 549 June 8, 549 June
Week 24 in 549 June 9, 549 June 15, 549 June
Week 25 in 549 June 16, 549 June 22, 549 June
Week 26 in 549 June 23, 549 June 29, 549 June
Week 27 in 549 June 30, 549 July 6, 549 June / July
Week 28 in 549 July 7, 549 July 13, 549 July
Week 29 in 549 July 14, 549 July 20, 549 July
Week 30 in 549 July 21, 549 July 27, 549 July
Week 31 in 549 July 28, 549 August 3, 549 July / August
Week 32 in 549 August 4, 549 August 10, 549 August
Week 33 in 549 August 11, 549 August 17, 549 August
Week 34 in 549 August 18, 549 August 24, 549 August
Week 35 in 549 August 25, 549 August 31, 549 August
Week 36 in 549 September 1, 549 September 7, 549 September
Week 37 in 549 September 8, 549 September 14, 549 September
Week 38 in 549 September 15, 549 September 21, 549 September
Week 39 in 549 September 22, 549 September 28, 549 September
Week 40 in 549 September 29, 549 October 5, 549 September / October
Week 41 in 549 October 6, 549 October 12, 549 October
Week 42 in 549 October 13, 549 October 19, 549 October
Week 43 in 549 October 20, 549 October 26, 549 October
Week 44 in 549 October 27, 549 November 2, 549 October / November
Week 45 in 549 November 3, 549 November 9, 549 November
Week 46 in 549 November 10, 549 November 16, 549 November
Week 47 in 549 November 17, 549 November 23, 549 November
Week 48 in 549 November 24, 549 November 30, 549 November
Week 49 in 549 December 1, 549 December 7, 549 December
Week 50 in 549 December 8, 549 December 14, 549 December
Week 51 in 549 December 15, 549 December 21, 549 December
Week 52 in 549 December 22, 549 December 28, 549 December

Calendars 549

January 549
MoTuWeThFrSaSu
Week 112345
Week 26789101112
Week 313141516171819
Week 420212223242526
Week 52728293031
February 549
MoTuWeThFrSaSu
Week 512
Week 63456789
Week 710111213141516
Week 817181920212223
Week 92425262728
March 549
MoTuWeThFrSaSu
Week 912
Week 103456789
Week 1110111213141516
Week 1217181920212223
Week 1324252627282930
Week 1431
April 549
MoTuWeThFrSaSu
Week 14123456
Week 1578910111213
Week 1614151617181920
Week 1721222324252627
Week 18282930
May 549
MoTuWeThFrSaSu
Week 181234
Week 19567891011
Week 2012131415161718
Week 2119202122232425
Week 22262728293031
June 549
MoTuWeThFrSaSu
Week 221
Week 232345678
Week 249101112131415
Week 2516171819202122
Week 2623242526272829
Week 2730
July 549
MoTuWeThFrSaSu
Week 27123456
Week 2878910111213
Week 2914151617181920
Week 3021222324252627
Week 3128293031
August 549
MoTuWeThFrSaSu
Week 31123
Week 3245678910
Week 3311121314151617
Week 3418192021222324
Week 3525262728293031
September 549
MoTuWeThFrSaSu
Week 361234567
Week 37891011121314
Week 3815161718192021
Week 3922232425262728
Week 402930
October 549
MoTuWeThFrSaSu
Week 4012345
Week 416789101112
Week 4213141516171819
Week 4320212223242526
Week 442728293031
November 549
MoTuWeThFrSaSu
Week 4412
Week 453456789
Week 4610111213141516
Week 4717181920212223
Week 4824252627282930
December 549
MoTuWeThFrSaSu
Week 491234567
Week 50891011121314
Week 5115161718192021
Week 5222232425262728
Week 1293031

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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 549 starts on December 30, 548 and ends on January 5, 549 (ISO 8601, Monday to Sunday). 549 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 549 have?

549 has 52 ISO weeks.

When does week 1 of 549 start?

Week 1 of 549 starts on December 30, 548 and ends on January 5, 549 (ISO 8601, Monday to Sunday).

When does the last week of 549 end?

Week 52 of 549 starts on December 22, 549 and ends on December 28, 549 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 550, 556, 561, 567, 572.

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.