Week numbers 1667

1667 has 52 ISO weeks. Week 1: Jan 3 – 9 · Week 52: Dec 26, 1667 – Jan 1, 1668

1667 at a glance

Weeks in 166752
Week 1January 3, 1667 – January 9, 1667
Week 52December 26, 1667 – January 1, 1668
Days in 1667365
Leap yearNo

All Weeks in 1667

Week From To Month
Week 1 in 1667 January 3, 1667 January 9, 1667 January
Week 2 in 1667 January 10, 1667 January 16, 1667 January
Week 3 in 1667 January 17, 1667 January 23, 1667 January
Week 4 in 1667 January 24, 1667 January 30, 1667 January
Week 5 in 1667 January 31, 1667 February 6, 1667 January / February
Week 6 in 1667 February 7, 1667 February 13, 1667 February
Week 7 in 1667 February 14, 1667 February 20, 1667 February
Week 8 in 1667 February 21, 1667 February 27, 1667 February
Week 9 in 1667 February 28, 1667 March 6, 1667 February / March
Week 10 in 1667 March 7, 1667 March 13, 1667 March
Week 11 in 1667 March 14, 1667 March 20, 1667 March
Week 12 in 1667 March 21, 1667 March 27, 1667 March
Week 13 in 1667 March 28, 1667 April 3, 1667 March / April
Week 14 in 1667 April 4, 1667 April 10, 1667 April
Week 15 in 1667 April 11, 1667 April 17, 1667 April
Week 16 in 1667 April 18, 1667 April 24, 1667 April
Week 17 in 1667 April 25, 1667 May 1, 1667 April / May
Week 18 in 1667 May 2, 1667 May 8, 1667 May
Week 19 in 1667 May 9, 1667 May 15, 1667 May
Week 20 in 1667 May 16, 1667 May 22, 1667 May
Week 21 in 1667 May 23, 1667 May 29, 1667 May
Week 22 in 1667 May 30, 1667 June 5, 1667 May / June
Week 23 in 1667 June 6, 1667 June 12, 1667 June
Week 24 in 1667 June 13, 1667 June 19, 1667 June
Week 25 in 1667 June 20, 1667 June 26, 1667 June
Week 26 in 1667 June 27, 1667 July 3, 1667 June / July
Week 27 in 1667 July 4, 1667 July 10, 1667 July
Week 28 in 1667 July 11, 1667 July 17, 1667 July
Week 29 in 1667 July 18, 1667 July 24, 1667 July
Week 30 in 1667 July 25, 1667 July 31, 1667 July
Week 31 in 1667 August 1, 1667 August 7, 1667 August
Week 32 in 1667 August 8, 1667 August 14, 1667 August
Week 33 in 1667 August 15, 1667 August 21, 1667 August
Week 34 in 1667 August 22, 1667 August 28, 1667 August
Week 35 in 1667 August 29, 1667 September 4, 1667 August / September
Week 36 in 1667 September 5, 1667 September 11, 1667 September
Week 37 in 1667 September 12, 1667 September 18, 1667 September
Week 38 in 1667 September 19, 1667 September 25, 1667 September
Week 39 in 1667 September 26, 1667 October 2, 1667 September / October
Week 40 in 1667 October 3, 1667 October 9, 1667 October
Week 41 in 1667 October 10, 1667 October 16, 1667 October
Week 42 in 1667 October 17, 1667 October 23, 1667 October
Week 43 in 1667 October 24, 1667 October 30, 1667 October
Week 44 in 1667 October 31, 1667 November 6, 1667 October / November
Week 45 in 1667 November 7, 1667 November 13, 1667 November
Week 46 in 1667 November 14, 1667 November 20, 1667 November
Week 47 in 1667 November 21, 1667 November 27, 1667 November
Week 48 in 1667 November 28, 1667 December 4, 1667 November / December
Week 49 in 1667 December 5, 1667 December 11, 1667 December
Week 50 in 1667 December 12, 1667 December 18, 1667 December
Week 51 in 1667 December 19, 1667 December 25, 1667 December
Week 52 in 1667 December 26, 1667 January 1, 1668 December / January

Calendars 1667

January 1667
MoTuWeThFrSaSu
Week 5212
Week 13456789
Week 210111213141516
Week 317181920212223
Week 424252627282930
Week 531
February 1667
MoTuWeThFrSaSu
Week 5123456
Week 678910111213
Week 714151617181920
Week 821222324252627
Week 928
March 1667
MoTuWeThFrSaSu
Week 9123456
Week 1078910111213
Week 1114151617181920
Week 1221222324252627
Week 1328293031
April 1667
MoTuWeThFrSaSu
Week 13123
Week 1445678910
Week 1511121314151617
Week 1618192021222324
Week 17252627282930
May 1667
MoTuWeThFrSaSu
Week 171
Week 182345678
Week 199101112131415
Week 2016171819202122
Week 2123242526272829
Week 223031
June 1667
MoTuWeThFrSaSu
Week 2212345
Week 236789101112
Week 2413141516171819
Week 2520212223242526
Week 2627282930
July 1667
MoTuWeThFrSaSu
Week 26123
Week 2745678910
Week 2811121314151617
Week 2918192021222324
Week 3025262728293031
August 1667
MoTuWeThFrSaSu
Week 311234567
Week 32891011121314
Week 3315161718192021
Week 3422232425262728
Week 35293031
September 1667
MoTuWeThFrSaSu
Week 351234
Week 36567891011
Week 3712131415161718
Week 3819202122232425
Week 392627282930
October 1667
MoTuWeThFrSaSu
Week 3912
Week 403456789
Week 4110111213141516
Week 4217181920212223
Week 4324252627282930
Week 4431
November 1667
MoTuWeThFrSaSu
Week 44123456
Week 4578910111213
Week 4614151617181920
Week 4721222324252627
Week 48282930
December 1667
MoTuWeThFrSaSu
Week 11234
Week 49567891011
Week 5012131415161718
Week 5119202122232425
Week 52262728293031

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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 1667 starts on January 3, 1667 and ends on January 9, 1667 (ISO 8601, Monday to Sunday). 1667 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 1667 have?

1667 has 52 ISO weeks.

When does week 1 of 1667 start?

Week 1 of 1667 starts on January 3, 1667 and ends on January 9, 1667 (ISO 8601, Monday to Sunday).

When does the last week of 1667 end?

Week 52 of 1667 starts on December 26, 1667 and ends on January 1, 1668 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 1671, 1676, 1682, 1688, 1693.

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.