Week numbers 491

491 has 52 ISO weeks. Week 1: Jan 1 – 7 · Week 52: Dec 24 – 30

491 at a glance

Weeks in 49152
Week 1January 1, 491 – January 7, 491
Week 52December 24, 491 – December 30, 491
Days in 491365
Leap yearNo

All Weeks in 491

Week From To Month
Week 1 in 491 January 1, 491 January 7, 491 January
Week 2 in 491 January 8, 491 January 14, 491 January
Week 3 in 491 January 15, 491 January 21, 491 January
Week 4 in 491 January 22, 491 January 28, 491 January
Week 5 in 491 January 29, 491 February 4, 491 January / February
Week 6 in 491 February 5, 491 February 11, 491 February
Week 7 in 491 February 12, 491 February 18, 491 February
Week 8 in 491 February 19, 491 February 25, 491 February
Week 9 in 491 February 26, 491 March 4, 491 February / March
Week 10 in 491 March 5, 491 March 11, 491 March
Week 11 in 491 March 12, 491 March 18, 491 March
Week 12 in 491 March 19, 491 March 25, 491 March
Week 13 in 491 March 26, 491 April 1, 491 March / April
Week 14 in 491 April 2, 491 April 8, 491 April
Week 15 in 491 April 9, 491 April 15, 491 April
Week 16 in 491 April 16, 491 April 22, 491 April
Week 17 in 491 April 23, 491 April 29, 491 April
Week 18 in 491 April 30, 491 May 6, 491 April / May
Week 19 in 491 May 7, 491 May 13, 491 May
Week 20 in 491 May 14, 491 May 20, 491 May
Week 21 in 491 May 21, 491 May 27, 491 May
Week 22 in 491 May 28, 491 June 3, 491 May / June
Week 23 in 491 June 4, 491 June 10, 491 June
Week 24 in 491 June 11, 491 June 17, 491 June
Week 25 in 491 June 18, 491 June 24, 491 June
Week 26 in 491 June 25, 491 July 1, 491 June / July
Week 27 in 491 July 2, 491 July 8, 491 July
Week 28 in 491 July 9, 491 July 15, 491 July
Week 29 in 491 July 16, 491 July 22, 491 July
Week 30 in 491 July 23, 491 July 29, 491 July
Week 31 in 491 July 30, 491 August 5, 491 July / August
Week 32 in 491 August 6, 491 August 12, 491 August
Week 33 in 491 August 13, 491 August 19, 491 August
Week 34 in 491 August 20, 491 August 26, 491 August
Week 35 in 491 August 27, 491 September 2, 491 August / September
Week 36 in 491 September 3, 491 September 9, 491 September
Week 37 in 491 September 10, 491 September 16, 491 September
Week 38 in 491 September 17, 491 September 23, 491 September
Week 39 in 491 September 24, 491 September 30, 491 September
Week 40 in 491 October 1, 491 October 7, 491 October
Week 41 in 491 October 8, 491 October 14, 491 October
Week 42 in 491 October 15, 491 October 21, 491 October
Week 43 in 491 October 22, 491 October 28, 491 October
Week 44 in 491 October 29, 491 November 4, 491 October / November
Week 45 in 491 November 5, 491 November 11, 491 November
Week 46 in 491 November 12, 491 November 18, 491 November
Week 47 in 491 November 19, 491 November 25, 491 November
Week 48 in 491 November 26, 491 December 2, 491 November / December
Week 49 in 491 December 3, 491 December 9, 491 December
Week 50 in 491 December 10, 491 December 16, 491 December
Week 51 in 491 December 17, 491 December 23, 491 December
Week 52 in 491 December 24, 491 December 30, 491 December

Calendars 491

January 491
MoTuWeThFrSaSu
Week 11234567
Week 2891011121314
Week 315161718192021
Week 422232425262728
Week 5293031
February 491
MoTuWeThFrSaSu
Week 51234
Week 6567891011
Week 712131415161718
Week 819202122232425
Week 9262728
March 491
MoTuWeThFrSaSu
Week 91234
Week 10567891011
Week 1112131415161718
Week 1219202122232425
Week 13262728293031
April 491
MoTuWeThFrSaSu
Week 131
Week 142345678
Week 159101112131415
Week 1616171819202122
Week 1723242526272829
Week 1830
May 491
MoTuWeThFrSaSu
Week 18123456
Week 1978910111213
Week 2014151617181920
Week 2121222324252627
Week 2228293031
June 491
MoTuWeThFrSaSu
Week 22123
Week 2345678910
Week 2411121314151617
Week 2518192021222324
Week 26252627282930
July 491
MoTuWeThFrSaSu
Week 261
Week 272345678
Week 289101112131415
Week 2916171819202122
Week 3023242526272829
Week 313031
August 491
MoTuWeThFrSaSu
Week 3112345
Week 326789101112
Week 3313141516171819
Week 3420212223242526
Week 352728293031
September 491
MoTuWeThFrSaSu
Week 3512
Week 363456789
Week 3710111213141516
Week 3817181920212223
Week 3924252627282930
October 491
MoTuWeThFrSaSu
Week 401234567
Week 41891011121314
Week 4215161718192021
Week 4322232425262728
Week 44293031
November 491
MoTuWeThFrSaSu
Week 441234
Week 45567891011
Week 4612131415161718
Week 4719202122232425
Week 482627282930
December 491
MoTuWeThFrSaSu
Week 212
Week 493456789
Week 5010111213141516
Week 5117181920212223
Week 5224252627282930
Week 131

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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 491 starts on January 1, 491 and ends on January 7, 491 (ISO 8601, Monday to Sunday). 491 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 491 have?

491 has 52 ISO weeks.

When does week 1 of 491 start?

Week 1 of 491 starts on January 1, 491 and ends on January 7, 491 (ISO 8601, Monday to Sunday).

When does the last week of 491 end?

Week 52 of 491 starts on December 24, 491 and ends on December 30, 491 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 493, 499, 505, 511, 516.

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.