Week numbers 1999

1999 has 52 ISO weeks. Week 1: Jan 4 – 10 · Week 52: Dec 27, 1999 – Jan 2, 2000

1999 at a glance

Weeks in 199952
Week 1January 4, 1999 – January 10, 1999
Week 52December 27, 1999 – January 2, 2000
Days in 1999365
Leap yearNo

All Weeks in 1999

Week From To Month
Week 1 in 1999 January 4, 1999 January 10, 1999 January
Week 2 in 1999 January 11, 1999 January 17, 1999 January
Week 3 in 1999 January 18, 1999 January 24, 1999 January
Week 4 in 1999 January 25, 1999 January 31, 1999 January
Week 5 in 1999 February 1, 1999 February 7, 1999 February
Week 6 in 1999 February 8, 1999 February 14, 1999 February
Week 7 in 1999 February 15, 1999 February 21, 1999 February
Week 8 in 1999 February 22, 1999 February 28, 1999 February
Week 9 in 1999 March 1, 1999 March 7, 1999 March
Week 10 in 1999 March 8, 1999 March 14, 1999 March
Week 11 in 1999 March 15, 1999 March 21, 1999 March
Week 12 in 1999 March 22, 1999 March 28, 1999 March
Week 13 in 1999 March 29, 1999 April 4, 1999 March / April
Week 14 in 1999 April 5, 1999 April 11, 1999 April
Week 15 in 1999 April 12, 1999 April 18, 1999 April
Week 16 in 1999 April 19, 1999 April 25, 1999 April
Week 17 in 1999 April 26, 1999 May 2, 1999 April / May
Week 18 in 1999 May 3, 1999 May 9, 1999 May
Week 19 in 1999 May 10, 1999 May 16, 1999 May
Week 20 in 1999 May 17, 1999 May 23, 1999 May
Week 21 in 1999 May 24, 1999 May 30, 1999 May
Week 22 in 1999 May 31, 1999 June 6, 1999 May / June
Week 23 in 1999 June 7, 1999 June 13, 1999 June
Week 24 in 1999 June 14, 1999 June 20, 1999 June
Week 25 in 1999 June 21, 1999 June 27, 1999 June
Week 26 in 1999 June 28, 1999 July 4, 1999 June / July
Week 27 in 1999 July 5, 1999 July 11, 1999 July
Week 28 in 1999 July 12, 1999 July 18, 1999 July
Week 29 in 1999 July 19, 1999 July 25, 1999 July
Week 30 in 1999 July 26, 1999 August 1, 1999 July / August
Week 31 in 1999 August 2, 1999 August 8, 1999 August
Week 32 in 1999 August 9, 1999 August 15, 1999 August
Week 33 in 1999 August 16, 1999 August 22, 1999 August
Week 34 in 1999 August 23, 1999 August 29, 1999 August
Week 35 in 1999 August 30, 1999 September 5, 1999 August / September
Week 36 in 1999 September 6, 1999 September 12, 1999 September
Week 37 in 1999 September 13, 1999 September 19, 1999 September
Week 38 in 1999 September 20, 1999 September 26, 1999 September
Week 39 in 1999 September 27, 1999 October 3, 1999 September / October
Week 40 in 1999 October 4, 1999 October 10, 1999 October
Week 41 in 1999 October 11, 1999 October 17, 1999 October
Week 42 in 1999 October 18, 1999 October 24, 1999 October
Week 43 in 1999 October 25, 1999 October 31, 1999 October
Week 44 in 1999 November 1, 1999 November 7, 1999 November
Week 45 in 1999 November 8, 1999 November 14, 1999 November
Week 46 in 1999 November 15, 1999 November 21, 1999 November
Week 47 in 1999 November 22, 1999 November 28, 1999 November
Week 48 in 1999 November 29, 1999 December 5, 1999 November / December
Week 49 in 1999 December 6, 1999 December 12, 1999 December
Week 50 in 1999 December 13, 1999 December 19, 1999 December
Week 51 in 1999 December 20, 1999 December 26, 1999 December
Week 52 in 1999 December 27, 1999 January 2, 2000 December / January

Calendars 1999

January 1999
MoTuWeThFrSaSu
Week 53123
Week 145678910
Week 211121314151617
Week 318192021222324
Week 425262728293031
February 1999
MoTuWeThFrSaSu
Week 51234567
Week 6891011121314
Week 715161718192021
Week 822232425262728
March 1999
MoTuWeThFrSaSu
Week 91234567
Week 10891011121314
Week 1115161718192021
Week 1222232425262728
Week 13293031
April 1999
MoTuWeThFrSaSu
Week 131234
Week 14567891011
Week 1512131415161718
Week 1619202122232425
Week 172627282930
May 1999
MoTuWeThFrSaSu
Week 1712
Week 183456789
Week 1910111213141516
Week 2017181920212223
Week 2124252627282930
Week 2231
June 1999
MoTuWeThFrSaSu
Week 22123456
Week 2378910111213
Week 2414151617181920
Week 2521222324252627
Week 26282930
July 1999
MoTuWeThFrSaSu
Week 261234
Week 27567891011
Week 2812131415161718
Week 2919202122232425
Week 30262728293031
August 1999
MoTuWeThFrSaSu
Week 301
Week 312345678
Week 329101112131415
Week 3316171819202122
Week 3423242526272829
Week 353031
September 1999
MoTuWeThFrSaSu
Week 3512345
Week 366789101112
Week 3713141516171819
Week 3820212223242526
Week 3927282930
October 1999
MoTuWeThFrSaSu
Week 39123
Week 4045678910
Week 4111121314151617
Week 4218192021222324
Week 4325262728293031
November 1999
MoTuWeThFrSaSu
Week 441234567
Week 45891011121314
Week 4615161718192021
Week 4722232425262728
Week 482930
December 1999
MoTuWeThFrSaSu
Week 112345
Week 496789101112
Week 5013141516171819
Week 5120212223242526
Week 522728293031

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 1999 starts on January 4, 1999 and ends on January 10, 1999 (ISO 8601, Monday to Sunday). 1999 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 1999 have?

1999 has 52 ISO weeks.

When does week 1 of 1999 start?

Week 1 of 1999 starts on January 4, 1999 and ends on January 10, 1999 (ISO 8601, Monday to Sunday).

When does the last week of 1999 end?

Week 52 of 1999 starts on December 27, 1999 and ends on January 2, 2000 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 2004, 2009, 2015, 2020, 2026.

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.