Week numbers 165

165 has 52 ISO weeks. Week 1: Dec 31, 164 – Jan 6, 165 · Week 52: Dec 23 – 29

165 at a glance

Weeks in 16552
Week 1December 31, 164 – January 6, 165
Week 52December 23, 165 – December 29, 165
Days in 165365
Leap yearNo

All Weeks in 165

Week From To Month
Week 1 in 165 December 31, 164 January 6, 165 December / January
Week 2 in 165 January 7, 165 January 13, 165 January
Week 3 in 165 January 14, 165 January 20, 165 January
Week 4 in 165 January 21, 165 January 27, 165 January
Week 5 in 165 January 28, 165 February 3, 165 January / February
Week 6 in 165 February 4, 165 February 10, 165 February
Week 7 in 165 February 11, 165 February 17, 165 February
Week 8 in 165 February 18, 165 February 24, 165 February
Week 9 in 165 February 25, 165 March 3, 165 February / March
Week 10 in 165 March 4, 165 March 10, 165 March
Week 11 in 165 March 11, 165 March 17, 165 March
Week 12 in 165 March 18, 165 March 24, 165 March
Week 13 in 165 March 25, 165 March 31, 165 March
Week 14 in 165 April 1, 165 April 7, 165 April
Week 15 in 165 April 8, 165 April 14, 165 April
Week 16 in 165 April 15, 165 April 21, 165 April
Week 17 in 165 April 22, 165 April 28, 165 April
Week 18 in 165 April 29, 165 May 5, 165 April / May
Week 19 in 165 May 6, 165 May 12, 165 May
Week 20 in 165 May 13, 165 May 19, 165 May
Week 21 in 165 May 20, 165 May 26, 165 May
Week 22 in 165 May 27, 165 June 2, 165 May / June
Week 23 in 165 June 3, 165 June 9, 165 June
Week 24 in 165 June 10, 165 June 16, 165 June
Week 25 in 165 June 17, 165 June 23, 165 June
Week 26 in 165 June 24, 165 June 30, 165 June
Week 27 in 165 July 1, 165 July 7, 165 July
Week 28 in 165 July 8, 165 July 14, 165 July
Week 29 in 165 July 15, 165 July 21, 165 July
Week 30 in 165 July 22, 165 July 28, 165 July
Week 31 in 165 July 29, 165 August 4, 165 July / August
Week 32 in 165 August 5, 165 August 11, 165 August
Week 33 in 165 August 12, 165 August 18, 165 August
Week 34 in 165 August 19, 165 August 25, 165 August
Week 35 in 165 August 26, 165 September 1, 165 August / September
Week 36 in 165 September 2, 165 September 8, 165 September
Week 37 in 165 September 9, 165 September 15, 165 September
Week 38 in 165 September 16, 165 September 22, 165 September
Week 39 in 165 September 23, 165 September 29, 165 September
Week 40 in 165 September 30, 165 October 6, 165 September / October
Week 41 in 165 October 7, 165 October 13, 165 October
Week 42 in 165 October 14, 165 October 20, 165 October
Week 43 in 165 October 21, 165 October 27, 165 October
Week 44 in 165 October 28, 165 November 3, 165 October / November
Week 45 in 165 November 4, 165 November 10, 165 November
Week 46 in 165 November 11, 165 November 17, 165 November
Week 47 in 165 November 18, 165 November 24, 165 November
Week 48 in 165 November 25, 165 December 1, 165 November / December
Week 49 in 165 December 2, 165 December 8, 165 December
Week 50 in 165 December 9, 165 December 15, 165 December
Week 51 in 165 December 16, 165 December 22, 165 December
Week 52 in 165 December 23, 165 December 29, 165 December

Calendars 165

January 165
MoTuWeThFrSaSu
Week 1123456
Week 278910111213
Week 314151617181920
Week 421222324252627
Week 528293031
February 165
MoTuWeThFrSaSu
Week 5123
Week 645678910
Week 711121314151617
Week 818192021222324
Week 925262728
March 165
MoTuWeThFrSaSu
Week 9123
Week 1045678910
Week 1111121314151617
Week 1218192021222324
Week 1325262728293031
April 165
MoTuWeThFrSaSu
Week 141234567
Week 15891011121314
Week 1615161718192021
Week 1722232425262728
Week 182930
May 165
MoTuWeThFrSaSu
Week 1812345
Week 196789101112
Week 2013141516171819
Week 2120212223242526
Week 222728293031
June 165
MoTuWeThFrSaSu
Week 2212
Week 233456789
Week 2410111213141516
Week 2517181920212223
Week 2624252627282930
July 165
MoTuWeThFrSaSu
Week 271234567
Week 28891011121314
Week 2915161718192021
Week 3022232425262728
Week 31293031
August 165
MoTuWeThFrSaSu
Week 311234
Week 32567891011
Week 3312131415161718
Week 3419202122232425
Week 35262728293031
September 165
MoTuWeThFrSaSu
Week 351
Week 362345678
Week 379101112131415
Week 3816171819202122
Week 3923242526272829
Week 4030
October 165
MoTuWeThFrSaSu
Week 40123456
Week 4178910111213
Week 4214151617181920
Week 4321222324252627
Week 4428293031
November 165
MoTuWeThFrSaSu
Week 44123
Week 4545678910
Week 4611121314151617
Week 4718192021222324
Week 48252627282930
December 165
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 165 starts on December 31, 164 and ends on January 6, 165 (ISO 8601, Monday to Sunday). 165 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 165 have?

165 has 52 ISO weeks.

When does week 1 of 165 start?

Week 1 of 165 starts on December 31, 164 and ends on January 6, 165 (ISO 8601, Monday to Sunday).

When does the last week of 165 end?

Week 52 of 165 starts on December 23, 165 and ends on December 29, 165 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 167, 172, 178, 184, 189.

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.