Week numbers 1604

1604 has 53 ISO weeks, because 1 January 1604 falls on a Thursday. Week 1: Dec 29, 1603 – Jan 4, 1604 · Week 53: Dec 27, 1604 – Jan 2, 1605

1604 at a glance

Weeks in 160453
Week 1December 29, 1603 – January 4, 1604
Week 53December 27, 1604 – January 2, 1605
Days in 1604366
Leap yearYes

All Weeks in 1604

Week From To Month
Week 1 in 1604 December 29, 1603 January 4, 1604 December / January
Week 2 in 1604 January 5, 1604 January 11, 1604 January
Week 3 in 1604 January 12, 1604 January 18, 1604 January
Week 4 in 1604 January 19, 1604 January 25, 1604 January
Week 5 in 1604 January 26, 1604 February 1, 1604 January / February
Week 6 in 1604 February 2, 1604 February 8, 1604 February
Week 7 in 1604 February 9, 1604 February 15, 1604 February
Week 8 in 1604 February 16, 1604 February 22, 1604 February
Week 9 in 1604 February 23, 1604 February 29, 1604 February
Week 10 in 1604 March 1, 1604 March 7, 1604 March
Week 11 in 1604 March 8, 1604 March 14, 1604 March
Week 12 in 1604 March 15, 1604 March 21, 1604 March
Week 13 in 1604 March 22, 1604 March 28, 1604 March
Week 14 in 1604 March 29, 1604 April 4, 1604 March / April
Week 15 in 1604 April 5, 1604 April 11, 1604 April
Week 16 in 1604 April 12, 1604 April 18, 1604 April
Week 17 in 1604 April 19, 1604 April 25, 1604 April
Week 18 in 1604 April 26, 1604 May 2, 1604 April / May
Week 19 in 1604 May 3, 1604 May 9, 1604 May
Week 20 in 1604 May 10, 1604 May 16, 1604 May
Week 21 in 1604 May 17, 1604 May 23, 1604 May
Week 22 in 1604 May 24, 1604 May 30, 1604 May
Week 23 in 1604 May 31, 1604 June 6, 1604 May / June
Week 24 in 1604 June 7, 1604 June 13, 1604 June
Week 25 in 1604 June 14, 1604 June 20, 1604 June
Week 26 in 1604 June 21, 1604 June 27, 1604 June
Week 27 in 1604 June 28, 1604 July 4, 1604 June / July
Week 28 in 1604 July 5, 1604 July 11, 1604 July
Week 29 in 1604 July 12, 1604 July 18, 1604 July
Week 30 in 1604 July 19, 1604 July 25, 1604 July
Week 31 in 1604 July 26, 1604 August 1, 1604 July / August
Week 32 in 1604 August 2, 1604 August 8, 1604 August
Week 33 in 1604 August 9, 1604 August 15, 1604 August
Week 34 in 1604 August 16, 1604 August 22, 1604 August
Week 35 in 1604 August 23, 1604 August 29, 1604 August
Week 36 in 1604 August 30, 1604 September 5, 1604 August / September
Week 37 in 1604 September 6, 1604 September 12, 1604 September
Week 38 in 1604 September 13, 1604 September 19, 1604 September
Week 39 in 1604 September 20, 1604 September 26, 1604 September
Week 40 in 1604 September 27, 1604 October 3, 1604 September / October
Week 41 in 1604 October 4, 1604 October 10, 1604 October
Week 42 in 1604 October 11, 1604 October 17, 1604 October
Week 43 in 1604 October 18, 1604 October 24, 1604 October
Week 44 in 1604 October 25, 1604 October 31, 1604 October
Week 45 in 1604 November 1, 1604 November 7, 1604 November
Week 46 in 1604 November 8, 1604 November 14, 1604 November
Week 47 in 1604 November 15, 1604 November 21, 1604 November
Week 48 in 1604 November 22, 1604 November 28, 1604 November
Week 49 in 1604 November 29, 1604 December 5, 1604 November / December
Week 50 in 1604 December 6, 1604 December 12, 1604 December
Week 51 in 1604 December 13, 1604 December 19, 1604 December
Week 52 in 1604 December 20, 1604 December 26, 1604 December
Week 53 in 1604 December 27, 1604 January 2, 1605 December / January

Calendars 1604

January 1604
MoTuWeThFrSaSu
Week 11234
Week 2567891011
Week 312131415161718
Week 419202122232425
Week 5262728293031
February 1604
MoTuWeThFrSaSu
Week 51
Week 62345678
Week 79101112131415
Week 816171819202122
Week 923242526272829
March 1604
MoTuWeThFrSaSu
Week 101234567
Week 11891011121314
Week 1215161718192021
Week 1322232425262728
Week 14293031
April 1604
MoTuWeThFrSaSu
Week 141234
Week 15567891011
Week 1612131415161718
Week 1719202122232425
Week 182627282930
May 1604
MoTuWeThFrSaSu
Week 1812
Week 193456789
Week 2010111213141516
Week 2117181920212223
Week 2224252627282930
Week 2331
June 1604
MoTuWeThFrSaSu
Week 23123456
Week 2478910111213
Week 2514151617181920
Week 2621222324252627
Week 27282930
July 1604
MoTuWeThFrSaSu
Week 271234
Week 28567891011
Week 2912131415161718
Week 3019202122232425
Week 31262728293031
August 1604
MoTuWeThFrSaSu
Week 311
Week 322345678
Week 339101112131415
Week 3416171819202122
Week 3523242526272829
Week 363031
September 1604
MoTuWeThFrSaSu
Week 3612345
Week 376789101112
Week 3813141516171819
Week 3920212223242526
Week 4027282930
October 1604
MoTuWeThFrSaSu
Week 40123
Week 4145678910
Week 4211121314151617
Week 4318192021222324
Week 4425262728293031
November 1604
MoTuWeThFrSaSu
Week 451234567
Week 46891011121314
Week 4715161718192021
Week 4822232425262728
Week 492930
December 1604
MoTuWeThFrSaSu
Week 212345
Week 506789101112
Week 5113141516171819
Week 5220212223242526
Week 532728293031

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 1604 starts on December 29, 1603 and ends on January 4, 1604 (ISO 8601, Monday to Sunday). 1604 has 53 ISO weeks, because 1 January 1604 falls on a Thursday.

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 1604 have?

1604 has 53 ISO weeks, because 1 January 1604 falls on a Thursday.

When does week 1 of 1604 start?

Week 1 of 1604 starts on December 29, 1603 and ends on January 4, 1604 (ISO 8601, Monday to Sunday).

When does the last week of 1604 end?

Week 53 of 1604 starts on December 27, 1604 and ends on January 2, 1605 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 1604, 1609, 1615, 1620, 1626.

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.