Week numbers 311

311 has 52 ISO weeks. Week 1: Jan 2 – 8 · Week 52: Dec 25 – 31

311 at a glance

Weeks in 31152
Week 1January 2, 311 – January 8, 311
Week 52December 25, 311 – December 31, 311
Days in 311365
Leap yearNo

All Weeks in 311

Week From To Month
Week 1 in 311 January 2, 311 January 8, 311 January
Week 2 in 311 January 9, 311 January 15, 311 January
Week 3 in 311 January 16, 311 January 22, 311 January
Week 4 in 311 January 23, 311 January 29, 311 January
Week 5 in 311 January 30, 311 February 5, 311 January / February
Week 6 in 311 February 6, 311 February 12, 311 February
Week 7 in 311 February 13, 311 February 19, 311 February
Week 8 in 311 February 20, 311 February 26, 311 February
Week 9 in 311 February 27, 311 March 5, 311 February / March
Week 10 in 311 March 6, 311 March 12, 311 March
Week 11 in 311 March 13, 311 March 19, 311 March
Week 12 in 311 March 20, 311 March 26, 311 March
Week 13 in 311 March 27, 311 April 2, 311 March / April
Week 14 in 311 April 3, 311 April 9, 311 April
Week 15 in 311 April 10, 311 April 16, 311 April
Week 16 in 311 April 17, 311 April 23, 311 April
Week 17 in 311 April 24, 311 April 30, 311 April
Week 18 in 311 May 1, 311 May 7, 311 May
Week 19 in 311 May 8, 311 May 14, 311 May
Week 20 in 311 May 15, 311 May 21, 311 May
Week 21 in 311 May 22, 311 May 28, 311 May
Week 22 in 311 May 29, 311 June 4, 311 May / June
Week 23 in 311 June 5, 311 June 11, 311 June
Week 24 in 311 June 12, 311 June 18, 311 June
Week 25 in 311 June 19, 311 June 25, 311 June
Week 26 in 311 June 26, 311 July 2, 311 June / July
Week 27 in 311 July 3, 311 July 9, 311 July
Week 28 in 311 July 10, 311 July 16, 311 July
Week 29 in 311 July 17, 311 July 23, 311 July
Week 30 in 311 July 24, 311 July 30, 311 July
Week 31 in 311 July 31, 311 August 6, 311 July / August
Week 32 in 311 August 7, 311 August 13, 311 August
Week 33 in 311 August 14, 311 August 20, 311 August
Week 34 in 311 August 21, 311 August 27, 311 August
Week 35 in 311 August 28, 311 September 3, 311 August / September
Week 36 in 311 September 4, 311 September 10, 311 September
Week 37 in 311 September 11, 311 September 17, 311 September
Week 38 in 311 September 18, 311 September 24, 311 September
Week 39 in 311 September 25, 311 October 1, 311 September / October
Week 40 in 311 October 2, 311 October 8, 311 October
Week 41 in 311 October 9, 311 October 15, 311 October
Week 42 in 311 October 16, 311 October 22, 311 October
Week 43 in 311 October 23, 311 October 29, 311 October
Week 44 in 311 October 30, 311 November 5, 311 October / November
Week 45 in 311 November 6, 311 November 12, 311 November
Week 46 in 311 November 13, 311 November 19, 311 November
Week 47 in 311 November 20, 311 November 26, 311 November
Week 48 in 311 November 27, 311 December 3, 311 November / December
Week 49 in 311 December 4, 311 December 10, 311 December
Week 50 in 311 December 11, 311 December 17, 311 December
Week 51 in 311 December 18, 311 December 24, 311 December
Week 52 in 311 December 25, 311 December 31, 311 December

Calendars 311

January 311
MoTuWeThFrSaSu
Week 521
Week 12345678
Week 29101112131415
Week 316171819202122
Week 423242526272829
Week 53031
February 311
MoTuWeThFrSaSu
Week 512345
Week 66789101112
Week 713141516171819
Week 820212223242526
Week 92728
March 311
MoTuWeThFrSaSu
Week 912345
Week 106789101112
Week 1113141516171819
Week 1220212223242526
Week 132728293031
April 311
MoTuWeThFrSaSu
Week 1312
Week 143456789
Week 1510111213141516
Week 1617181920212223
Week 1724252627282930
May 311
MoTuWeThFrSaSu
Week 181234567
Week 19891011121314
Week 2015161718192021
Week 2122232425262728
Week 22293031
June 311
MoTuWeThFrSaSu
Week 221234
Week 23567891011
Week 2412131415161718
Week 2519202122232425
Week 262627282930
July 311
MoTuWeThFrSaSu
Week 2612
Week 273456789
Week 2810111213141516
Week 2917181920212223
Week 3024252627282930
Week 3131
August 311
MoTuWeThFrSaSu
Week 31123456
Week 3278910111213
Week 3314151617181920
Week 3421222324252627
Week 3528293031
September 311
MoTuWeThFrSaSu
Week 35123
Week 3645678910
Week 3711121314151617
Week 3818192021222324
Week 39252627282930
October 311
MoTuWeThFrSaSu
Week 391
Week 402345678
Week 419101112131415
Week 4216171819202122
Week 4323242526272829
Week 443031
November 311
MoTuWeThFrSaSu
Week 4412345
Week 456789101112
Week 4613141516171819
Week 4720212223242526
Week 4827282930
December 311
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 311 starts on January 2, 311 and ends on January 8, 311 (ISO 8601, Monday to Sunday). 311 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 311 have?

311 has 52 ISO weeks.

When does week 1 of 311 start?

Week 1 of 311 starts on January 2, 311 and ends on January 8, 311 (ISO 8601, Monday to Sunday).

When does the last week of 311 end?

Week 52 of 311 starts on December 25, 311 and ends on December 31, 311 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 314, 320, 325, 331, 336.

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.