Week numbers 1861

1861 has 52 ISO weeks. Week 1 of 1861 starts on December 31, 1860 and ends on January 6, 1861 (ISO 8601, Monday to Sunday).

1861 at a glance

Weeks in 186152
Week 1December 31, 1860 – January 6, 1861
Week 52December 23, 1861 – December 29, 1861
Days in 1861365
Leap yearNo

All Weeks in 1861

Week From To Month
Week 1 in 1861 December 31, 1860 January 6, 1861 December / January
Week 2 in 1861 January 7, 1861 January 13, 1861 January
Week 3 in 1861 January 14, 1861 January 20, 1861 January
Week 4 in 1861 January 21, 1861 January 27, 1861 January
Week 5 in 1861 January 28, 1861 February 3, 1861 January / February
Week 6 in 1861 February 4, 1861 February 10, 1861 February
Week 7 in 1861 February 11, 1861 February 17, 1861 February
Week 8 in 1861 February 18, 1861 February 24, 1861 February
Week 9 in 1861 February 25, 1861 March 3, 1861 February / March
Week 10 in 1861 March 4, 1861 March 10, 1861 March
Week 11 in 1861 March 11, 1861 March 17, 1861 March
Week 12 in 1861 March 18, 1861 March 24, 1861 March
Week 13 in 1861 March 25, 1861 March 31, 1861 March
Week 14 in 1861 April 1, 1861 April 7, 1861 April
Week 15 in 1861 April 8, 1861 April 14, 1861 April
Week 16 in 1861 April 15, 1861 April 21, 1861 April
Week 17 in 1861 April 22, 1861 April 28, 1861 April
Week 18 in 1861 April 29, 1861 May 5, 1861 April / May
Week 19 in 1861 May 6, 1861 May 12, 1861 May
Week 20 in 1861 May 13, 1861 May 19, 1861 May
Week 21 in 1861 May 20, 1861 May 26, 1861 May
Week 22 in 1861 May 27, 1861 June 2, 1861 May / June
Week 23 in 1861 June 3, 1861 June 9, 1861 June
Week 24 in 1861 June 10, 1861 June 16, 1861 June
Week 25 in 1861 June 17, 1861 June 23, 1861 June
Week 26 in 1861 June 24, 1861 June 30, 1861 June
Week 27 in 1861 July 1, 1861 July 7, 1861 July
Week 28 in 1861 July 8, 1861 July 14, 1861 July
Week 29 in 1861 July 15, 1861 July 21, 1861 July
Week 30 in 1861 July 22, 1861 July 28, 1861 July
Week 31 in 1861 July 29, 1861 August 4, 1861 July / August
Week 32 in 1861 August 5, 1861 August 11, 1861 August
Week 33 in 1861 August 12, 1861 August 18, 1861 August
Week 34 in 1861 August 19, 1861 August 25, 1861 August
Week 35 in 1861 August 26, 1861 September 1, 1861 August / September
Week 36 in 1861 September 2, 1861 September 8, 1861 September
Week 37 in 1861 September 9, 1861 September 15, 1861 September
Week 38 in 1861 September 16, 1861 September 22, 1861 September
Week 39 in 1861 September 23, 1861 September 29, 1861 September
Week 40 in 1861 September 30, 1861 October 6, 1861 September / October
Week 41 in 1861 October 7, 1861 October 13, 1861 October
Week 42 in 1861 October 14, 1861 October 20, 1861 October
Week 43 in 1861 October 21, 1861 October 27, 1861 October
Week 44 in 1861 October 28, 1861 November 3, 1861 October / November
Week 45 in 1861 November 4, 1861 November 10, 1861 November
Week 46 in 1861 November 11, 1861 November 17, 1861 November
Week 47 in 1861 November 18, 1861 November 24, 1861 November
Week 48 in 1861 November 25, 1861 December 1, 1861 November / December
Week 49 in 1861 December 2, 1861 December 8, 1861 December
Week 50 in 1861 December 9, 1861 December 15, 1861 December
Week 51 in 1861 December 16, 1861 December 22, 1861 December
Week 52 in 1861 December 23, 1861 December 29, 1861 December

Calendars 1861

January 1861
MoTuWeThFrSaSu
Week 1123456
Week 278910111213
Week 314151617181920
Week 421222324252627
Week 528293031
February 1861
MoTuWeThFrSaSu
Week 5123
Week 645678910
Week 711121314151617
Week 818192021222324
Week 925262728
March 1861
MoTuWeThFrSaSu
Week 9123
Week 1045678910
Week 1111121314151617
Week 1218192021222324
Week 1325262728293031
April 1861
MoTuWeThFrSaSu
Week 141234567
Week 15891011121314
Week 1615161718192021
Week 1722232425262728
Week 182930
May 1861
MoTuWeThFrSaSu
Week 1812345
Week 196789101112
Week 2013141516171819
Week 2120212223242526
Week 222728293031
June 1861
MoTuWeThFrSaSu
Week 2212
Week 233456789
Week 2410111213141516
Week 2517181920212223
Week 2624252627282930
July 1861
MoTuWeThFrSaSu
Week 271234567
Week 28891011121314
Week 2915161718192021
Week 3022232425262728
Week 31293031
August 1861
MoTuWeThFrSaSu
Week 311234
Week 32567891011
Week 3312131415161718
Week 3419202122232425
Week 35262728293031
September 1861
MoTuWeThFrSaSu
Week 351
Week 362345678
Week 379101112131415
Week 3816171819202122
Week 3923242526272829
Week 4030
October 1861
MoTuWeThFrSaSu
Week 40123456
Week 4178910111213
Week 4214151617181920
Week 4321222324252627
Week 4428293031
November 1861
MoTuWeThFrSaSu
Week 44123
Week 4545678910
Week 4611121314151617
Week 4718192021222324
Week 48252627282930
December 1861
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 1861 starts on December 31, 1860 and ends on January 6, 1861 (ISO 8601, Monday to Sunday). 1861 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 1861 have?

1861 has 52 ISO weeks.

When does week 1 of 1861 start?

Week 1 of 1861 starts on December 31, 1860 and ends on January 6, 1861 (ISO 8601, Monday to Sunday).

When does the last week of 1861 end?

Week 52 of 1861 starts on December 23, 1861 and ends on December 29, 1861 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 1863, 1868, 1874, 1880, 1885.

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.