Week numbers 439

439 has 52 ISO weeks. Week 1: Jan 3 – 9 · Week 52: Dec 26, 439 – Jan 1, 440

439 at a glance

Weeks in 43952
Week 1January 3, 439 – January 9, 439
Week 52December 26, 439 – January 1, 440
Days in 439365
Leap yearNo

All Weeks in 439

Week From To Month
Week 1 in 439 January 3, 439 January 9, 439 January
Week 2 in 439 January 10, 439 January 16, 439 January
Week 3 in 439 January 17, 439 January 23, 439 January
Week 4 in 439 January 24, 439 January 30, 439 January
Week 5 in 439 January 31, 439 February 6, 439 January / February
Week 6 in 439 February 7, 439 February 13, 439 February
Week 7 in 439 February 14, 439 February 20, 439 February
Week 8 in 439 February 21, 439 February 27, 439 February
Week 9 in 439 February 28, 439 March 6, 439 February / March
Week 10 in 439 March 7, 439 March 13, 439 March
Week 11 in 439 March 14, 439 March 20, 439 March
Week 12 in 439 March 21, 439 March 27, 439 March
Week 13 in 439 March 28, 439 April 3, 439 March / April
Week 14 in 439 April 4, 439 April 10, 439 April
Week 15 in 439 April 11, 439 April 17, 439 April
Week 16 in 439 April 18, 439 April 24, 439 April
Week 17 in 439 April 25, 439 May 1, 439 April / May
Week 18 in 439 May 2, 439 May 8, 439 May
Week 19 in 439 May 9, 439 May 15, 439 May
Week 20 in 439 May 16, 439 May 22, 439 May
Week 21 in 439 May 23, 439 May 29, 439 May
Week 22 in 439 May 30, 439 June 5, 439 May / June
Week 23 in 439 June 6, 439 June 12, 439 June
Week 24 in 439 June 13, 439 June 19, 439 June
Week 25 in 439 June 20, 439 June 26, 439 June
Week 26 in 439 June 27, 439 July 3, 439 June / July
Week 27 in 439 July 4, 439 July 10, 439 July
Week 28 in 439 July 11, 439 July 17, 439 July
Week 29 in 439 July 18, 439 July 24, 439 July
Week 30 in 439 July 25, 439 July 31, 439 July
Week 31 in 439 August 1, 439 August 7, 439 August
Week 32 in 439 August 8, 439 August 14, 439 August
Week 33 in 439 August 15, 439 August 21, 439 August
Week 34 in 439 August 22, 439 August 28, 439 August
Week 35 in 439 August 29, 439 September 4, 439 August / September
Week 36 in 439 September 5, 439 September 11, 439 September
Week 37 in 439 September 12, 439 September 18, 439 September
Week 38 in 439 September 19, 439 September 25, 439 September
Week 39 in 439 September 26, 439 October 2, 439 September / October
Week 40 in 439 October 3, 439 October 9, 439 October
Week 41 in 439 October 10, 439 October 16, 439 October
Week 42 in 439 October 17, 439 October 23, 439 October
Week 43 in 439 October 24, 439 October 30, 439 October
Week 44 in 439 October 31, 439 November 6, 439 October / November
Week 45 in 439 November 7, 439 November 13, 439 November
Week 46 in 439 November 14, 439 November 20, 439 November
Week 47 in 439 November 21, 439 November 27, 439 November
Week 48 in 439 November 28, 439 December 4, 439 November / December
Week 49 in 439 December 5, 439 December 11, 439 December
Week 50 in 439 December 12, 439 December 18, 439 December
Week 51 in 439 December 19, 439 December 25, 439 December
Week 52 in 439 December 26, 439 January 1, 440 December / January

Calendars 439

January 439
MoTuWeThFrSaSu
Week 5212
Week 13456789
Week 210111213141516
Week 317181920212223
Week 424252627282930
Week 531
February 439
MoTuWeThFrSaSu
Week 5123456
Week 678910111213
Week 714151617181920
Week 821222324252627
Week 928
March 439
MoTuWeThFrSaSu
Week 9123456
Week 1078910111213
Week 1114151617181920
Week 1221222324252627
Week 1328293031
April 439
MoTuWeThFrSaSu
Week 13123
Week 1445678910
Week 1511121314151617
Week 1618192021222324
Week 17252627282930
May 439
MoTuWeThFrSaSu
Week 171
Week 182345678
Week 199101112131415
Week 2016171819202122
Week 2123242526272829
Week 223031
June 439
MoTuWeThFrSaSu
Week 2212345
Week 236789101112
Week 2413141516171819
Week 2520212223242526
Week 2627282930
July 439
MoTuWeThFrSaSu
Week 26123
Week 2745678910
Week 2811121314151617
Week 2918192021222324
Week 3025262728293031
August 439
MoTuWeThFrSaSu
Week 311234567
Week 32891011121314
Week 3315161718192021
Week 3422232425262728
Week 35293031
September 439
MoTuWeThFrSaSu
Week 351234
Week 36567891011
Week 3712131415161718
Week 3819202122232425
Week 392627282930
October 439
MoTuWeThFrSaSu
Week 3912
Week 403456789
Week 4110111213141516
Week 4217181920212223
Week 4324252627282930
Week 4431
November 439
MoTuWeThFrSaSu
Week 44123456
Week 4578910111213
Week 4614151617181920
Week 4721222324252627
Week 48282930
December 439
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 439 starts on January 3, 439 and ends on January 9, 439 (ISO 8601, Monday to Sunday). 439 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 439 have?

439 has 52 ISO weeks.

When does week 1 of 439 start?

Week 1 of 439 starts on January 3, 439 and ends on January 9, 439 (ISO 8601, Monday to Sunday).

When does the last week of 439 end?

Week 52 of 439 starts on December 26, 439 and ends on January 1, 440 (ISO 8601, Monday to Sunday).

Which years have 53 weeks?

The next years with 53 ISO weeks are 443, 448, 454, 460, 465.

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.