Week numbers 1966

1966 has 52 ISO weeks. Week 1: Jan 3 – 9 · Week 52: Dec 26, 1966 – Jan 1, 1967

1966 at a glance

Weeks in 196652
Week 1January 3, 1966 – January 9, 1966
Week 52December 26, 1966 – January 1, 1967
Days in 1966365
Leap yearNo

All Weeks in 1966

Week From To Month
Week 1 in 1966 January 3, 1966 January 9, 1966 January
Week 2 in 1966 January 10, 1966 January 16, 1966 January
Week 3 in 1966 January 17, 1966 January 23, 1966 January
Week 4 in 1966 January 24, 1966 January 30, 1966 January
Week 5 in 1966 January 31, 1966 February 6, 1966 January / February
Week 6 in 1966 February 7, 1966 February 13, 1966 February
Week 7 in 1966 February 14, 1966 February 20, 1966 February
Week 8 in 1966 February 21, 1966 February 27, 1966 February
Week 9 in 1966 February 28, 1966 March 6, 1966 February / March
Week 10 in 1966 March 7, 1966 March 13, 1966 March
Week 11 in 1966 March 14, 1966 March 20, 1966 March
Week 12 in 1966 March 21, 1966 March 27, 1966 March
Week 13 in 1966 March 28, 1966 April 3, 1966 March / April
Week 14 in 1966 April 4, 1966 April 10, 1966 April
Week 15 in 1966 April 11, 1966 April 17, 1966 April
Week 16 in 1966 April 18, 1966 April 24, 1966 April
Week 17 in 1966 April 25, 1966 May 1, 1966 April / May
Week 18 in 1966 May 2, 1966 May 8, 1966 May
Week 19 in 1966 May 9, 1966 May 15, 1966 May
Week 20 in 1966 May 16, 1966 May 22, 1966 May
Week 21 in 1966 May 23, 1966 May 29, 1966 May
Week 22 in 1966 May 30, 1966 June 5, 1966 May / June
Week 23 in 1966 June 6, 1966 June 12, 1966 June
Week 24 in 1966 June 13, 1966 June 19, 1966 June
Week 25 in 1966 June 20, 1966 June 26, 1966 June
Week 26 in 1966 June 27, 1966 July 3, 1966 June / July
Week 27 in 1966 July 4, 1966 July 10, 1966 July
Week 28 in 1966 July 11, 1966 July 17, 1966 July
Week 29 in 1966 July 18, 1966 July 24, 1966 July
Week 30 in 1966 July 25, 1966 July 31, 1966 July
Week 31 in 1966 August 1, 1966 August 7, 1966 August
Week 32 in 1966 August 8, 1966 August 14, 1966 August
Week 33 in 1966 August 15, 1966 August 21, 1966 August
Week 34 in 1966 August 22, 1966 August 28, 1966 August
Week 35 in 1966 August 29, 1966 September 4, 1966 August / September
Week 36 in 1966 September 5, 1966 September 11, 1966 September
Week 37 in 1966 September 12, 1966 September 18, 1966 September
Week 38 in 1966 September 19, 1966 September 25, 1966 September
Week 39 in 1966 September 26, 1966 October 2, 1966 September / October
Week 40 in 1966 October 3, 1966 October 9, 1966 October
Week 41 in 1966 October 10, 1966 October 16, 1966 October
Week 42 in 1966 October 17, 1966 October 23, 1966 October
Week 43 in 1966 October 24, 1966 October 30, 1966 October
Week 44 in 1966 October 31, 1966 November 6, 1966 October / November
Week 45 in 1966 November 7, 1966 November 13, 1966 November
Week 46 in 1966 November 14, 1966 November 20, 1966 November
Week 47 in 1966 November 21, 1966 November 27, 1966 November
Week 48 in 1966 November 28, 1966 December 4, 1966 November / December
Week 49 in 1966 December 5, 1966 December 11, 1966 December
Week 50 in 1966 December 12, 1966 December 18, 1966 December
Week 51 in 1966 December 19, 1966 December 25, 1966 December
Week 52 in 1966 December 26, 1966 January 1, 1967 December / January

Calendars 1966

January 1966
MoTuWeThFrSaSu
Week 5212
Week 13456789
Week 210111213141516
Week 317181920212223
Week 424252627282930
Week 531
February 1966
MoTuWeThFrSaSu
Week 5123456
Week 678910111213
Week 714151617181920
Week 821222324252627
Week 928
March 1966
MoTuWeThFrSaSu
Week 9123456
Week 1078910111213
Week 1114151617181920
Week 1221222324252627
Week 1328293031
April 1966
MoTuWeThFrSaSu
Week 13123
Week 1445678910
Week 1511121314151617
Week 1618192021222324
Week 17252627282930
May 1966
MoTuWeThFrSaSu
Week 171
Week 182345678
Week 199101112131415
Week 2016171819202122
Week 2123242526272829
Week 223031
June 1966
MoTuWeThFrSaSu
Week 2212345
Week 236789101112
Week 2413141516171819
Week 2520212223242526
Week 2627282930
July 1966
MoTuWeThFrSaSu
Week 26123
Week 2745678910
Week 2811121314151617
Week 2918192021222324
Week 3025262728293031
August 1966
MoTuWeThFrSaSu
Week 311234567
Week 32891011121314
Week 3315161718192021
Week 3422232425262728
Week 35293031
September 1966
MoTuWeThFrSaSu
Week 351234
Week 36567891011
Week 3712131415161718
Week 3819202122232425
Week 392627282930
October 1966
MoTuWeThFrSaSu
Week 3912
Week 403456789
Week 4110111213141516
Week 4217181920212223
Week 4324252627282930
Week 4431
November 1966
MoTuWeThFrSaSu
Week 44123456
Week 4578910111213
Week 4614151617181920
Week 4721222324252627
Week 48282930
December 1966
MoTuWeThFrSaSu
Week 11234
Week 49567891011
Week 5012131415161718
Week 5119202122232425
Week 52262728293031

Download Calendar in printable A4 PDF

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 1966 starts on January 3, 1966 and ends on January 9, 1966 (ISO 8601, Monday to Sunday). 1966 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 1966 have?

1966 has 52 ISO weeks.

When does week 1 of 1966 start?

Week 1 of 1966 starts on January 3, 1966 and ends on January 9, 1966 (ISO 8601, Monday to Sunday).

When does the last week of 1966 end?

Week 52 of 1966 starts on December 26, 1966 and ends on January 1, 1967 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 1970, 1976, 1981, 1987, 1992.

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.