Week numbers 543

543 has 52 ISO weeks. Week 1: Dec 31, 542 – Jan 6, 543 · Week 52: Dec 23 – 29

543 at a glance

Weeks in 54352
Week 1December 31, 542 – January 6, 543
Week 52December 23, 543 – December 29, 543
Days in 543365
Leap yearNo

All Weeks in 543

Week From To Month
Week 1 in 543 December 31, 542 January 6, 543 December / January
Week 2 in 543 January 7, 543 January 13, 543 January
Week 3 in 543 January 14, 543 January 20, 543 January
Week 4 in 543 January 21, 543 January 27, 543 January
Week 5 in 543 January 28, 543 February 3, 543 January / February
Week 6 in 543 February 4, 543 February 10, 543 February
Week 7 in 543 February 11, 543 February 17, 543 February
Week 8 in 543 February 18, 543 February 24, 543 February
Week 9 in 543 February 25, 543 March 3, 543 February / March
Week 10 in 543 March 4, 543 March 10, 543 March
Week 11 in 543 March 11, 543 March 17, 543 March
Week 12 in 543 March 18, 543 March 24, 543 March
Week 13 in 543 March 25, 543 March 31, 543 March
Week 14 in 543 April 1, 543 April 7, 543 April
Week 15 in 543 April 8, 543 April 14, 543 April
Week 16 in 543 April 15, 543 April 21, 543 April
Week 17 in 543 April 22, 543 April 28, 543 April
Week 18 in 543 April 29, 543 May 5, 543 April / May
Week 19 in 543 May 6, 543 May 12, 543 May
Week 20 in 543 May 13, 543 May 19, 543 May
Week 21 in 543 May 20, 543 May 26, 543 May
Week 22 in 543 May 27, 543 June 2, 543 May / June
Week 23 in 543 June 3, 543 June 9, 543 June
Week 24 in 543 June 10, 543 June 16, 543 June
Week 25 in 543 June 17, 543 June 23, 543 June
Week 26 in 543 June 24, 543 June 30, 543 June
Week 27 in 543 July 1, 543 July 7, 543 July
Week 28 in 543 July 8, 543 July 14, 543 July
Week 29 in 543 July 15, 543 July 21, 543 July
Week 30 in 543 July 22, 543 July 28, 543 July
Week 31 in 543 July 29, 543 August 4, 543 July / August
Week 32 in 543 August 5, 543 August 11, 543 August
Week 33 in 543 August 12, 543 August 18, 543 August
Week 34 in 543 August 19, 543 August 25, 543 August
Week 35 in 543 August 26, 543 September 1, 543 August / September
Week 36 in 543 September 2, 543 September 8, 543 September
Week 37 in 543 September 9, 543 September 15, 543 September
Week 38 in 543 September 16, 543 September 22, 543 September
Week 39 in 543 September 23, 543 September 29, 543 September
Week 40 in 543 September 30, 543 October 6, 543 September / October
Week 41 in 543 October 7, 543 October 13, 543 October
Week 42 in 543 October 14, 543 October 20, 543 October
Week 43 in 543 October 21, 543 October 27, 543 October
Week 44 in 543 October 28, 543 November 3, 543 October / November
Week 45 in 543 November 4, 543 November 10, 543 November
Week 46 in 543 November 11, 543 November 17, 543 November
Week 47 in 543 November 18, 543 November 24, 543 November
Week 48 in 543 November 25, 543 December 1, 543 November / December
Week 49 in 543 December 2, 543 December 8, 543 December
Week 50 in 543 December 9, 543 December 15, 543 December
Week 51 in 543 December 16, 543 December 22, 543 December
Week 52 in 543 December 23, 543 December 29, 543 December

Calendars 543

January 543
MoTuWeThFrSaSu
Week 1123456
Week 278910111213
Week 314151617181920
Week 421222324252627
Week 528293031
February 543
MoTuWeThFrSaSu
Week 5123
Week 645678910
Week 711121314151617
Week 818192021222324
Week 925262728
March 543
MoTuWeThFrSaSu
Week 9123
Week 1045678910
Week 1111121314151617
Week 1218192021222324
Week 1325262728293031
April 543
MoTuWeThFrSaSu
Week 141234567
Week 15891011121314
Week 1615161718192021
Week 1722232425262728
Week 182930
May 543
MoTuWeThFrSaSu
Week 1812345
Week 196789101112
Week 2013141516171819
Week 2120212223242526
Week 222728293031
June 543
MoTuWeThFrSaSu
Week 2212
Week 233456789
Week 2410111213141516
Week 2517181920212223
Week 2624252627282930
July 543
MoTuWeThFrSaSu
Week 271234567
Week 28891011121314
Week 2915161718192021
Week 3022232425262728
Week 31293031
August 543
MoTuWeThFrSaSu
Week 311234
Week 32567891011
Week 3312131415161718
Week 3419202122232425
Week 35262728293031
September 543
MoTuWeThFrSaSu
Week 351
Week 362345678
Week 379101112131415
Week 3816171819202122
Week 3923242526272829
Week 4030
October 543
MoTuWeThFrSaSu
Week 40123456
Week 4178910111213
Week 4214151617181920
Week 4321222324252627
Week 4428293031
November 543
MoTuWeThFrSaSu
Week 44123
Week 4545678910
Week 4611121314151617
Week 4718192021222324
Week 48252627282930
December 543
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 543 starts on December 31, 542 and ends on January 6, 543 (ISO 8601, Monday to Sunday). 543 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 543 have?

543 has 52 ISO weeks.

When does week 1 of 543 start?

Week 1 of 543 starts on December 31, 542 and ends on January 6, 543 (ISO 8601, Monday to Sunday).

When does the last week of 543 end?

Week 52 of 543 starts on December 23, 543 and ends on December 29, 543 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 544, 550, 556, 561, 567.

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.