Week numbers 129

129 has 52 ISO weeks. Week 1: Jan 3 – 9 · Week 52: Dec 26, 129 – Jan 1, 130

129 at a glance

Weeks in 12952
Week 1January 3, 129 – January 9, 129
Week 52December 26, 129 – January 1, 130
Days in 129365
Leap yearNo

All Weeks in 129

Week From To Month
Week 1 in 129 January 3, 129 January 9, 129 January
Week 2 in 129 January 10, 129 January 16, 129 January
Week 3 in 129 January 17, 129 January 23, 129 January
Week 4 in 129 January 24, 129 January 30, 129 January
Week 5 in 129 January 31, 129 February 6, 129 January / February
Week 6 in 129 February 7, 129 February 13, 129 February
Week 7 in 129 February 14, 129 February 20, 129 February
Week 8 in 129 February 21, 129 February 27, 129 February
Week 9 in 129 February 28, 129 March 6, 129 February / March
Week 10 in 129 March 7, 129 March 13, 129 March
Week 11 in 129 March 14, 129 March 20, 129 March
Week 12 in 129 March 21, 129 March 27, 129 March
Week 13 in 129 March 28, 129 April 3, 129 March / April
Week 14 in 129 April 4, 129 April 10, 129 April
Week 15 in 129 April 11, 129 April 17, 129 April
Week 16 in 129 April 18, 129 April 24, 129 April
Week 17 in 129 April 25, 129 May 1, 129 April / May
Week 18 in 129 May 2, 129 May 8, 129 May
Week 19 in 129 May 9, 129 May 15, 129 May
Week 20 in 129 May 16, 129 May 22, 129 May
Week 21 in 129 May 23, 129 May 29, 129 May
Week 22 in 129 May 30, 129 June 5, 129 May / June
Week 23 in 129 June 6, 129 June 12, 129 June
Week 24 in 129 June 13, 129 June 19, 129 June
Week 25 in 129 June 20, 129 June 26, 129 June
Week 26 in 129 June 27, 129 July 3, 129 June / July
Week 27 in 129 July 4, 129 July 10, 129 July
Week 28 in 129 July 11, 129 July 17, 129 July
Week 29 in 129 July 18, 129 July 24, 129 July
Week 30 in 129 July 25, 129 July 31, 129 July
Week 31 in 129 August 1, 129 August 7, 129 August
Week 32 in 129 August 8, 129 August 14, 129 August
Week 33 in 129 August 15, 129 August 21, 129 August
Week 34 in 129 August 22, 129 August 28, 129 August
Week 35 in 129 August 29, 129 September 4, 129 August / September
Week 36 in 129 September 5, 129 September 11, 129 September
Week 37 in 129 September 12, 129 September 18, 129 September
Week 38 in 129 September 19, 129 September 25, 129 September
Week 39 in 129 September 26, 129 October 2, 129 September / October
Week 40 in 129 October 3, 129 October 9, 129 October
Week 41 in 129 October 10, 129 October 16, 129 October
Week 42 in 129 October 17, 129 October 23, 129 October
Week 43 in 129 October 24, 129 October 30, 129 October
Week 44 in 129 October 31, 129 November 6, 129 October / November
Week 45 in 129 November 7, 129 November 13, 129 November
Week 46 in 129 November 14, 129 November 20, 129 November
Week 47 in 129 November 21, 129 November 27, 129 November
Week 48 in 129 November 28, 129 December 4, 129 November / December
Week 49 in 129 December 5, 129 December 11, 129 December
Week 50 in 129 December 12, 129 December 18, 129 December
Week 51 in 129 December 19, 129 December 25, 129 December
Week 52 in 129 December 26, 129 January 1, 130 December / January

Calendars 129

January 129
MoTuWeThFrSaSu
Week 5312
Week 13456789
Week 210111213141516
Week 317181920212223
Week 424252627282930
Week 531
February 129
MoTuWeThFrSaSu
Week 5123456
Week 678910111213
Week 714151617181920
Week 821222324252627
Week 928
March 129
MoTuWeThFrSaSu
Week 9123456
Week 1078910111213
Week 1114151617181920
Week 1221222324252627
Week 1328293031
April 129
MoTuWeThFrSaSu
Week 13123
Week 1445678910
Week 1511121314151617
Week 1618192021222324
Week 17252627282930
May 129
MoTuWeThFrSaSu
Week 171
Week 182345678
Week 199101112131415
Week 2016171819202122
Week 2123242526272829
Week 223031
June 129
MoTuWeThFrSaSu
Week 2212345
Week 236789101112
Week 2413141516171819
Week 2520212223242526
Week 2627282930
July 129
MoTuWeThFrSaSu
Week 26123
Week 2745678910
Week 2811121314151617
Week 2918192021222324
Week 3025262728293031
August 129
MoTuWeThFrSaSu
Week 311234567
Week 32891011121314
Week 3315161718192021
Week 3422232425262728
Week 35293031
September 129
MoTuWeThFrSaSu
Week 351234
Week 36567891011
Week 3712131415161718
Week 3819202122232425
Week 392627282930
October 129
MoTuWeThFrSaSu
Week 3912
Week 403456789
Week 4110111213141516
Week 4217181920212223
Week 4324252627282930
Week 4431
November 129
MoTuWeThFrSaSu
Week 44123456
Week 4578910111213
Week 4614151617181920
Week 4721222324252627
Week 48282930
December 129
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 129 starts on January 3, 129 and ends on January 9, 129 (ISO 8601, Monday to Sunday). 129 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 129 have?

129 has 52 ISO weeks.

When does week 1 of 129 start?

Week 1 of 129 starts on January 3, 129 and ends on January 9, 129 (ISO 8601, Monday to Sunday).

When does the last week of 129 end?

Week 52 of 129 starts on December 26, 129 and ends on January 1, 130 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 133, 139, 144, 150, 156.

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.