What's the current Week Number?

Get current week number according to the ISO-8601 standard.

 
Current Week Number : 39

Week 39 start date is Monday, 21 September 2020 and end date is Sunday, 27 September 2020 as per ISO-8601 standard.

The ISO week-numbering year starts at the first day (Monday) of week 01 and ends at the Sunday before the new ISO year (hence without overlap or gap). It consists of 52 or 53 full weeks. The first ISO week of a year may have up to three days that are actually in the calendar year that is ending; if three, they are Monday, Tuesday and Wednesday. Similarly, the last ISO week of a year may have up to three days that are actually in the calendar year that is starting; if three, they are Friday, Saturday, and Sunday. The Thursday of each ISO week is always in the calendar year denoted by the ISO week-numbering year.

There are several mutually equivalent and compatible descriptions of week 01:

  • the week with the year's first Thursday in it (the formal ISO definition),
  • the week with 4 January in it,
  • the first week with the majority (four or more) of its days in the starting year, and
  • the week starting with the Monday in the period 29 December – 4 January.

As a consequence, if 1 January is on a Monday, Tuesday, Wednesday or Thursday, it is in week 01. If 1 January is on a Friday, Saturday or Sunday, it is in week 52 or 53 of the previous year (there is no week 00). 28 December is always in the last week of its year.

The week number can be described by counting the Thursdays: week 12 contains the 12th Thursday of the year.

Current year weeks with start and end date :

Week Number Week Start Date Week End Date
01 30 December 2019 05 January 2020
02 06 January 2020 12 January 2020
03 13 January 2020 19 January 2020
04 20 January 2020 26 January 2020
05 27 January 2020 02 February 2020
06 03 February 2020 09 February 2020
07 10 February 2020 16 February 2020
08 17 February 2020 23 February 2020
09 24 February 2020 01 March 2020
10 02 March 2020 08 March 2020
11 09 March 2020 15 March 2020
12 16 March 2020 22 March 2020
13 23 March 2020 29 March 2020
14 30 March 2020 05 April 2020
15 06 April 2020 12 April 2020
16 13 April 2020 19 April 2020
17 20 April 2020 26 April 2020
18 27 April 2020 03 May 2020
19 04 May 2020 10 May 2020
20 11 May 2020 17 May 2020
21 18 May 2020 24 May 2020
22 25 May 2020 31 May 2020
23 01 June 2020 07 June 2020
24 08 June 2020 14 June 2020
25 15 June 2020 21 June 2020
26 22 June 2020 28 June 2020
27 29 June 2020 05 July 2020
28 06 July 2020 12 July 2020
29 13 July 2020 19 July 2020
30 20 July 2020 26 July 2020
31 27 July 2020 02 August 2020
32 03 August 2020 09 August 2020
33 10 August 2020 16 August 2020
34 17 August 2020 23 August 2020
35 24 August 2020 30 August 2020
36 31 August 2020 06 September 2020
37 07 September 2020 13 September 2020
38 14 September 2020 20 September 2020
39 21 September 2020 27 September 2020
40 28 September 2020 04 October 2020
41 05 October 2020 11 October 2020
42 12 October 2020 18 October 2020
43 19 October 2020 25 October 2020
44 26 October 2020 01 November 2020
45 02 November 2020 08 November 2020
46 09 November 2020 15 November 2020
47 16 November 2020 22 November 2020
48 23 November 2020 29 November 2020
49 30 November 2020 06 December 2020
50 07 December 2020 13 December 2020
51 14 December 2020 20 December 2020
52 21 December 2020 27 December 2020
53 28 December 2020 03 January 2021