Week numbers 312

312 has 52 ISO weeks. Week 1: Jan 1 – 7 · Week 52: Dec 23 – 29

312 at a glance

Weeks in 31252
Week 1January 1, 312 – January 7, 312
Week 52December 23, 312 – December 29, 312
Days in 312366
Leap yearYes

All Weeks in 312

Week From To Month
Week 1 in 312 January 1, 312 January 7, 312 January
Week 2 in 312 January 8, 312 January 14, 312 January
Week 3 in 312 January 15, 312 January 21, 312 January
Week 4 in 312 January 22, 312 January 28, 312 January
Week 5 in 312 January 29, 312 February 4, 312 January / February
Week 6 in 312 February 5, 312 February 11, 312 February
Week 7 in 312 February 12, 312 February 18, 312 February
Week 8 in 312 February 19, 312 February 25, 312 February
Week 9 in 312 February 26, 312 March 3, 312 February / March
Week 10 in 312 March 4, 312 March 10, 312 March
Week 11 in 312 March 11, 312 March 17, 312 March
Week 12 in 312 March 18, 312 March 24, 312 March
Week 13 in 312 March 25, 312 March 31, 312 March
Week 14 in 312 April 1, 312 April 7, 312 April
Week 15 in 312 April 8, 312 April 14, 312 April
Week 16 in 312 April 15, 312 April 21, 312 April
Week 17 in 312 April 22, 312 April 28, 312 April
Week 18 in 312 April 29, 312 May 5, 312 April / May
Week 19 in 312 May 6, 312 May 12, 312 May
Week 20 in 312 May 13, 312 May 19, 312 May
Week 21 in 312 May 20, 312 May 26, 312 May
Week 22 in 312 May 27, 312 June 2, 312 May / June
Week 23 in 312 June 3, 312 June 9, 312 June
Week 24 in 312 June 10, 312 June 16, 312 June
Week 25 in 312 June 17, 312 June 23, 312 June
Week 26 in 312 June 24, 312 June 30, 312 June
Week 27 in 312 July 1, 312 July 7, 312 July
Week 28 in 312 July 8, 312 July 14, 312 July
Week 29 in 312 July 15, 312 July 21, 312 July
Week 30 in 312 July 22, 312 July 28, 312 July
Week 31 in 312 July 29, 312 August 4, 312 July / August
Week 32 in 312 August 5, 312 August 11, 312 August
Week 33 in 312 August 12, 312 August 18, 312 August
Week 34 in 312 August 19, 312 August 25, 312 August
Week 35 in 312 August 26, 312 September 1, 312 August / September
Week 36 in 312 September 2, 312 September 8, 312 September
Week 37 in 312 September 9, 312 September 15, 312 September
Week 38 in 312 September 16, 312 September 22, 312 September
Week 39 in 312 September 23, 312 September 29, 312 September
Week 40 in 312 September 30, 312 October 6, 312 September / October
Week 41 in 312 October 7, 312 October 13, 312 October
Week 42 in 312 October 14, 312 October 20, 312 October
Week 43 in 312 October 21, 312 October 27, 312 October
Week 44 in 312 October 28, 312 November 3, 312 October / November
Week 45 in 312 November 4, 312 November 10, 312 November
Week 46 in 312 November 11, 312 November 17, 312 November
Week 47 in 312 November 18, 312 November 24, 312 November
Week 48 in 312 November 25, 312 December 1, 312 November / December
Week 49 in 312 December 2, 312 December 8, 312 December
Week 50 in 312 December 9, 312 December 15, 312 December
Week 51 in 312 December 16, 312 December 22, 312 December
Week 52 in 312 December 23, 312 December 29, 312 December

Calendars 312

January 312
MoTuWeThFrSaSu
Week 11234567
Week 2891011121314
Week 315161718192021
Week 422232425262728
Week 5293031
February 312
MoTuWeThFrSaSu
Week 51234
Week 6567891011
Week 712131415161718
Week 819202122232425
Week 926272829
March 312
MoTuWeThFrSaSu
Week 9123
Week 1045678910
Week 1111121314151617
Week 1218192021222324
Week 1325262728293031
April 312
MoTuWeThFrSaSu
Week 141234567
Week 15891011121314
Week 1615161718192021
Week 1722232425262728
Week 182930
May 312
MoTuWeThFrSaSu
Week 1812345
Week 196789101112
Week 2013141516171819
Week 2120212223242526
Week 222728293031
June 312
MoTuWeThFrSaSu
Week 2212
Week 233456789
Week 2410111213141516
Week 2517181920212223
Week 2624252627282930
July 312
MoTuWeThFrSaSu
Week 271234567
Week 28891011121314
Week 2915161718192021
Week 3022232425262728
Week 31293031
August 312
MoTuWeThFrSaSu
Week 311234
Week 32567891011
Week 3312131415161718
Week 3419202122232425
Week 35262728293031
September 312
MoTuWeThFrSaSu
Week 351
Week 362345678
Week 379101112131415
Week 3816171819202122
Week 3923242526272829
Week 4030
October 312
MoTuWeThFrSaSu
Week 40123456
Week 4178910111213
Week 4214151617181920
Week 4321222324252627
Week 4428293031
November 312
MoTuWeThFrSaSu
Week 44123
Week 4545678910
Week 4611121314151617
Week 4718192021222324
Week 48252627282930
December 312
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 312 starts on January 1, 312 and ends on January 7, 312 (ISO 8601, Monday to Sunday). 312 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 312 have?

312 has 52 ISO weeks.

When does week 1 of 312 start?

Week 1 of 312 starts on January 1, 312 and ends on January 7, 312 (ISO 8601, Monday to Sunday).

When does the last week of 312 end?

Week 52 of 312 starts on December 23, 312 and ends on December 29, 312 (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.