Week Number Calculator

Calendar weeks 2023 - CW 2023

Week Numbers ﹣ Calendar weeks 2023

The following table shows all ISO calendar weeks 2023 from 1 to 53, with their start date beginning on Monday and their end date falling on Sunday.

European and Asian ISO calendar weeks 2023 - CW 2023
CW Mo Tu We Th Fr Sa SuISO-Name
CW 1 02/01 03/01 04/01 05/01 06/01 07/01 08/012023‑W01
CW 2 09/01 10/01 11/01 12/01 13/01 14/01 15/012023‑W02
CW 3 16/01 17/01 18/01 19/01 20/01 21/01 22/012023‑W03
CW 4 23/01 24/01 25/01 26/01 27/01 28/01 29/012023‑W04
CW 5 30/01 31/01 01/02 02/02 03/02 04/02 05/022023‑W05
CW 6 06/02 07/02 08/02 09/02 10/02 11/02 12/022023‑W06
CW 7 13/02 14/02 15/02 16/02 17/02 18/02 19/022023‑W07
CW 8 20/02 21/02 22/02 23/02 24/02 25/02 26/022023‑W08
CW 9 27/02 28/02 01/03 02/03 03/03 04/03 05/032023‑W09
CW 10 06/03 07/03 08/03 09/03 10/03 11/03 12/032023‑W10
CW 11 13/03 14/03 15/03 16/03 17/03 18/03 19/032023‑W11
CW 12 20/03 21/03 22/03 23/03 24/03 25/03 26/032023‑W12
CW 13 27/03 28/03 29/03 30/03 31/03 01/04 02/042023‑W13
CW 14 03/04 04/04 05/04 06/04 07/04 08/04 09/042023‑W14
CW 15 10/04 11/04 12/04 13/04 14/04 15/04 16/042023‑W15
CW 16 17/04 18/04 19/04 20/04 21/04 22/04 23/042023‑W16
CW 17 24/04 25/04 26/04 27/04 28/04 29/04 30/042023‑W17
CW 18 01/05 02/05 03/05 04/05 05/05 06/05 07/052023‑W18
CW 19 08/05 09/05 10/05 11/05 12/05 13/05 14/052023‑W19
CW 20 15/05 16/05 17/05 18/05 19/05 20/05 21/052023‑W20
CW 21 22/05 23/05 24/05 25/05 26/05 27/05 28/052023‑W21
CW 22 29/05 30/05 31/05 01/06 02/06 03/06 04/062023‑W22
CW 23 05/06 06/06 07/06 08/06 09/06 10/06 11/062023‑W23
CW 24 12/06 13/06 14/06 15/06 16/06 17/06 18/062023‑W24
CW 25 19/06 20/06 21/06 22/06 23/06 24/06 25/062023‑W25
CW 26 26/06 27/06 28/06 29/06 30/06 01/07 02/072023‑W26
CW 27 03/07 04/07 05/07 06/07 07/07 08/07 09/072023‑W27
CW 28 10/07 11/07 12/07 13/07 14/07 15/07 16/072023‑W28
CW 29 17/07 18/07 19/07 20/07 21/07 22/07 23/072023‑W29
CW 30 24/07 25/07 26/07 27/07 28/07 29/07 30/072023‑W30
CW 31 31/07 01/08 02/08 03/08 04/08 05/08 06/082023‑W31
CW 32 07/08 08/08 09/08 10/08 11/08 12/08 13/082023‑W32
CW 33 14/08 15/08 16/08 17/08 18/08 19/08 20/082023‑W33
CW 34 21/08 22/08 23/08 24/08 25/08 26/08 27/082023‑W34
CW 35 28/08 29/08 30/08 31/08 01/09 02/09 03/092023‑W35
CW 36 04/09 05/09 06/09 07/09 08/09 09/09 10/092023‑W36
CW 37 11/09 12/09 13/09 14/09 15/09 16/09 17/092023‑W37
CW 38 18/09 19/09 20/09 21/09 22/09 23/09 24/092023‑W38
CW 39 25/09 26/09 27/09 28/09 29/09 30/09 01/102023‑W39
CW 40 02/10 03/10 04/10 05/10 06/10 07/10 08/102023‑W40
CW 41 09/10 10/10 11/10 12/10 13/10 14/10 15/102023‑W41
CW 42 16/10 17/10 18/10 19/10 20/10 21/10 22/102023‑W42
CW 43 23/10 24/10 25/10 26/10 27/10 28/10 29/102023‑W43
CW 44 30/10 31/10 01/11 02/11 03/11 04/11 05/112023‑W44
CW 45 06/11 07/11 08/11 09/11 10/11 11/11 12/112023‑W45
CW 46 13/11 14/11 15/11 16/11 17/11 18/11 19/112023‑W46
CW 47 20/11 21/11 22/11 23/11 24/11 25/11 26/112023‑W47
CW 48 27/11 28/11 29/11 30/11 01/12 02/12 03/122023‑W48
CW 49 04/12 05/12 06/12 07/12 08/12 09/12 10/122023‑W49
CW 50 11/12 12/12 13/12 14/12 15/12 16/12 17/122023‑W50
CW 51 18/12 19/12 20/12 21/12 22/12 23/12 24/122023‑W51
CW 52 25/12 26/12 27/12 28/12 29/12 30/12 31/122023‑W52
CW 53 2023 does not exist week 53. 2023 has only 52 calendar weeks.

The ISO calendar weeks for 2023 are defined according to the international ISO standard. That is, each calendar week starts on Monday and ends on Sunday. Even during the change of year, a new calendar week starts on Monday and ends on Sunday. The ISO standard specifies that the majority of the first calendar week (i.e., at least four days) must lie in the new year.

Table of all American calendar weeks for 2023

The following table shows all "American" calendar weeks 2023, with their start date beginning on Sunday and their end date falling on Saturday.

American calendar weeks 2023 - CW 2023
CW Su Mo Tu We Th Fr Sa
CW 101/0102/0103/0104/0105/0106/0107/01
CW 2 08/01 09/01 10/01 11/01 12/01 13/01 14/01
CW 3 15/01 16/01 17/01 18/01 19/01 20/01 21/01
CW 4 22/01 23/01 24/01 25/01 26/01 27/01 28/01
CW 5 29/01 30/01 31/01 01/02 02/02 03/02 04/02
CW 6 05/02 06/02 07/02 08/02 09/02 10/02 11/02
CW 7 12/02 13/02 14/02 15/02 16/02 17/02 18/02
CW 8 19/02 20/02 21/02 22/02 23/02 24/02 25/02
CW 9 26/02 27/02 28/02 01/03 02/03 03/03 04/03
CW 10 05/03 06/03 07/03 08/03 09/03 10/03 11/03
CW 11 12/03 13/03 14/03 15/03 16/03 17/03 18/03
CW 12 19/03 20/03 21/03 22/03 23/03 24/03 25/03
CW 13 26/03 27/03 28/03 29/03 30/03 31/03 01/04
CW 14 02/04 03/04 04/04 05/04 06/04 07/04 08/04
CW 15 09/04 10/04 11/04 12/04 13/04 14/04 15/04
CW 16 16/04 17/04 18/04 19/04 20/04 21/04 22/04
CW 17 23/04 24/04 25/04 26/04 27/04 28/04 29/04
CW 18 30/04 01/05 02/05 03/05 04/05 05/05 06/05
CW 19 07/05 08/05 09/05 10/05 11/05 12/05 13/05
CW 20 14/05 15/05 16/05 17/05 18/05 19/05 20/05
CW 21 21/05 22/05 23/05 24/05 25/05 26/05 27/05
CW 22 28/05 29/05 30/05 31/05 01/06 02/06 03/06
CW 23 04/06 05/06 06/06 07/06 08/06 09/06 10/06
CW 24 11/06 12/06 13/06 14/06 15/06 16/06 17/06
CW 25 18/06 19/06 20/06 21/06 22/06 23/06 24/06
CW 26 25/06 26/06 27/06 28/06 29/06 30/06 01/07
CW 27 02/07 03/07 04/07 05/07 06/07 07/07 08/07
CW 28 09/07 10/07 11/07 12/07 13/07 14/07 15/07
CW 29 16/07 17/07 18/07 19/07 20/07 21/07 22/07
CW 30 23/07 24/07 25/07 26/07 27/07 28/07 29/07
CW 31 30/07 31/07 01/08 02/08 03/08 04/08 05/08
CW 32 06/08 07/08 08/08 09/08 10/08 11/08 12/08
CW 33 13/08 14/08 15/08 16/08 17/08 18/08 19/08
CW 34 20/08 21/08 22/08 23/08 24/08 25/08 26/08
CW 35 27/08 28/08 29/08 30/08 31/08 01/09 02/09
CW 36 03/09 04/09 05/09 06/09 07/09 08/09 09/09
CW 37 10/09 11/09 12/09 13/09 14/09 15/09 16/09
CW 38 17/09 18/09 19/09 20/09 21/09 22/09 23/09
CW 39 24/09 25/09 26/09 27/09 28/09 29/09 30/09
CW 40 01/10 02/10 03/10 04/10 05/10 06/10 07/10
CW 41 08/10 09/10 10/10 11/10 12/10 13/10 14/10
CW 42 15/10 16/10 17/10 18/10 19/10 20/10 21/10
CW 43 22/10 23/10 24/10 25/10 26/10 27/10 28/10
CW 44 29/10 29/10 30/10 31/10 01/11 02/11 03/11
CW 45 05/11 06/11 07/11 08/11 09/11 10/11 11/11
CW 46 12/11 13/11 14/11 15/11 16/11 17/11 18/11
CW 47 19/11 20/11 21/11 22/11 23/11 24/11 25/11
CW 48 26/11 27/11 28/11 29/11 30/11 01/12 02/12
CW 49 03/12 04/12 05/12 06/12 07/12 08/12 09/12
CW 50 10/12 11/12 12/12 13/12 14/12 15/12 16/12
CW 51 17/12 18/12 19/12 20/12 21/12 22/12 23/12
CW 52 24/12 25/12 26/12 27/12 28/12 29/12 30/12
CW 5331/12

The "American" calendar weeks for 2023 are used in the USA, Canada and most Latin American countries, Australia, Japan, Israel, South Korea and others. Unlike the otherwise internationally standardised ISO weeks, the American calendar weeks start on Sundays instead of Mondays and end on Saturdays. However, the first calendar week always begins on the 1st of January and the last always ends on the 31st of December. These two weeks can have fewer than seven days. There are always 53 calendar weeks, except in a leap year where 31st December is a Sunday. As a result, such a year will have 54 calendar weeks.

Calculation of any calendar weeks 2023

Source information

As source for the information in the 'Week Numbers' category, we have used in particular:

Last update on April 1, 2023

The pages of the 'Week Numbers' category were last editorially reviewed by Michael Mühl on April 1, 2023. They all correspond to the current status.

Previous changes on June 25, 2021