Week Number Calculator

All calendar weeks of the current year and our Week Calculator

Thema Week Numbers ﹣ Calculator

Table with all current European and Asian ISO calendar weeks

The following table shows all ISO calendar weeks 2022 from 1 to 53, with their start date beginning on Monday and their end date falling on Sunday.

European and Asian ISO calendar weeks 2022 - CW 2022
CWStart of the CWEnd of the CW ISO-Name
CW 1Monday, January 3, 2022Sunday, January 9, 20222022‑W01
CW 2Monday, January 10, 2022Sunday, January 16, 20222022‑W02
CW 3Monday, January 17, 2022Sunday, January 23, 20222022‑W03
CW 4Monday, January 24, 2022Sunday, January 30, 20222022‑W04
CW 5Monday, January 31, 2022Sunday, February 6, 20222022‑W05
CW 6Monday, February 7, 2022Sunday, February 13, 20222022‑W06
CW 7Monday, February 14, 2022Sunday, February 20, 20222022‑W07
CW 8Monday, February 21, 2022Sunday, February 27, 20222022‑W08
CW 9Monday, February 28, 2022Sunday, March 6, 20222022‑W09
CW 10Monday, March 7, 2022Sunday, March 13, 20222022‑W10
CW 11Monday, March 14, 2022Sunday, March 20, 20222022‑W11
CW 12Monday, March 21, 2022Sunday, March 27, 20222022‑W12
CW 13Monday, March 28, 2022Sunday, April 3, 20222022‑W13
CW 14Monday, April 4, 2022Sunday, April 10, 20222022‑W14
CW 15Monday, April 11, 2022Sunday, April 17, 20222022‑W15
CW 16Monday, April 18, 2022Sunday, April 24, 20222022‑W16
CW 17Monday, April 25, 2022Sunday, May 1, 20222022‑W17
CW 18Monday, May 2, 2022Sunday, May 8, 20222022‑W18
CW 19Monday, May 9, 2022Sunday, May 15, 20222022‑W19
CW 20Monday, May 16, 2022Sunday, May 22, 20222022‑W20
CW 21Monday, May 23, 2022Sunday, May 29, 20222022‑W21
CW 22Monday, May 30, 2022Sunday, June 5, 20222022‑W22
CW 23Monday, June 6, 2022Sunday, June 12, 20222022‑W23
CW 24Monday, June 13, 2022Sunday, June 19, 20222022‑W24
CW 25Monday, June 20, 2022Sunday, June 26, 20222022‑W25
CW 26Monday, June 27, 2022Sunday, July 3, 20222022‑W26
CW 27Monday, July 4, 2022Sunday, July 10, 20222022‑W27
CW 28Monday, July 11, 2022Sunday, July 17, 20222022‑W28
CW 29Monday, July 18, 2022Sunday, July 24, 20222022‑W29
CW 30Monday, July 25, 2022Sunday, July 31, 20222022‑W30
CW 31Monday, August 1, 2022Sunday, August 7, 20222022‑W31
CW 32Monday, August 8, 2022Sunday, August 14, 20222022‑W32
CW 33Monday, August 15, 2022Sunday, August 21, 20222022‑W33
CW 34Monday, August 22, 2022Sunday, August 28, 20222022‑W34
CW 35Monday, August 29, 2022Sunday, September 4, 20222022‑W35
CW 36Monday, September 5, 2022Sunday, September 11, 20222022‑W36
CW 37Monday, September 12, 2022Sunday, September 18, 20222022‑W37
CW 38Monday, September 19, 2022Sunday, September 25, 20222022‑W38
CW 39Monday, September 26, 2022Sunday, October 2, 20222022‑W39
CW 40Monday, October 3, 2022Sunday, October 9, 20222022‑W40
CW 41Monday, October 10, 2022Sunday, October 16, 20222022‑W41
CW 42Monday, October 17, 2022Sunday, October 23, 20222022‑W42
CW 43Monday, October 24, 2022Sunday, October 30, 20222022‑W43
CW 44Monday, October 31, 2022Sunday, November 6, 20222022‑W44
CW 45Monday, November 7, 2022Sunday, November 13, 20222022‑W45
CW 46Monday, November 14, 2022Sunday, November 20, 20222022‑W46
CW 47Monday, November 21, 2022Sunday, November 27, 20222022‑W47
CW 48Monday, November 28, 2022Sunday, December 4, 20222022‑W48
CW 49Monday, December 5, 2022Sunday, December 11, 20222022‑W49
CW 50Monday, December 12, 2022Sunday, December 18, 20222022‑W50
CW 51Monday, December 19, 2022Sunday, December 25, 20222022‑W51
CW 52Monday, December 26, 2022Sunday, January 1, 20232022‑W52
CW 532022 does not exist week 532022 has only 52 calendar weeks2022‑W53

See below for more on the calculation method of the ISO calendar weeks.

Table of all current American calendar weeks

The following table shows all "American" calendar weeks 2022, with their start date beginning on Sunday and their end date falling on Saturday.

American calendar weeks 2022 - CW 2022
CWStart of the CWEnd of the CW
1Saturday, January 1, 2022Saturday, January 1, 2022
2Sunday, January 2, 2022Saturday, January 8, 2022
3Sunday, January 9, 2022Saturday, January 15, 2022
4Sunday, January 16, 2022Saturday, January 22, 2022
5Sunday, January 23, 2022Saturday, January 29, 2022
6Sunday, January 30, 2022Saturday, February 5, 2022
7Sunday, February 6, 2022Saturday, February 12, 2022
8Sunday, February 13, 2022Saturday, February 19, 2022
9Sunday, February 20, 2022Saturday, February 26, 2022
10Sunday, February 27, 2022Saturday, March 5, 2022
11Sunday, March 6, 2022Saturday, March 12, 2022
12Sunday, March 13, 2022Saturday, March 19, 2022
13Sunday, March 20, 2022Saturday, March 26, 2022
14Sunday, March 27, 2022Saturday, April 2, 2022
15Sunday, April 3, 2022Saturday, April 9, 2022
16Sunday, April 10, 2022Saturday, April 16, 2022
17Sunday, April 17, 2022Saturday, April 23, 2022
18Sunday, April 24, 2022Saturday, April 30, 2022
19Sunday, May 1, 2022Saturday, May 7, 2022
20Sunday, May 8, 2022Saturday, May 14, 2022
21Sunday, May 15, 2022Saturday, May 21, 2022
22Sunday, May 22, 2022Saturday, May 28, 2022
23Sunday, May 29, 2022Saturday, June 4, 2022
24Sunday, June 5, 2022Saturday, June 11, 2022
25Sunday, June 12, 2022Saturday, June 18, 2022
26Sunday, June 19, 2022Saturday, June 25, 2022
27Sunday, June 26, 2022Saturday, July 2, 2022
28Sunday, July 3, 2022Saturday, July 9, 2022
29Sunday, July 10, 2022Saturday, July 16, 2022
30Sunday, July 17, 2022Saturday, July 23, 2022
31Sunday, July 24, 2022Saturday, July 30, 2022
32Sunday, July 31, 2022Saturday, August 6, 2022
33Sunday, August 7, 2022Saturday, August 13, 2022
34Sunday, August 14, 2022Saturday, August 20, 2022
35Sunday, August 21, 2022Saturday, August 27, 2022
36Sunday, August 28, 2022Saturday, September 3, 2022
37Sunday, September 4, 2022Saturday, September 10, 2022
38Sunday, September 11, 2022Saturday, September 17, 2022
39Sunday, September 18, 2022Saturday, September 24, 2022
40Sunday, September 25, 2022Saturday, October 1, 2022
41Sunday, October 2, 2022Saturday, October 8, 2022
42Sunday, October 9, 2022Saturday, October 15, 2022
43Sunday, October 16, 2022Saturday, October 22, 2022
44Sunday, October 23, 2022Saturday, October 29, 2022
45Sunday, October 30, 2022Saturday, November 5, 2022
46Sunday, November 6, 2022Saturday, November 12, 2022
47Sunday, November 13, 2022Saturday, November 19, 2022
48Sunday, November 20, 2022Saturday, November 26, 2022
49Sunday, November 27, 2022Saturday, December 3, 2022
50Sunday, December 4, 2022Saturday, December 10, 2022
51Sunday, December 11, 2022Saturday, December 17, 2022
52Sunday, December 18, 2022Saturday, December 24, 2022
53Sunday, December 25, 2022Saturday, December 31, 2022

See below for more on the calculation method of American calendar weeks.

Calendar Week Calculator

With the Calendar Week Calculator, you can use a date to calculate the corresponding calendar week. Conversely, you can use the calendar week to determine the date of the beginning and end of the week you are looking for. You can use the international ISO 8601 calculation method for Europe and Asia and the American calculation method for calendar weeks as the internationally relevant method for calculating calendar weeks.


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More information on the current calendar week

On the special page Current Calendar Week, you will always find the currently valid calendar week. In the navigation, you can select each individual calendar week or, for example, all historical calendar weeks 2021 or select the very latest calendar weeks 2022.

Tips for making entries in the Week Number Calculator

Depending on the selection made in the input of the calculator, different input fields open, which we describe in the following.

Calculation of

Please select the value that you want to calculate. After selecting "Week number", the week number is calculated for the entered date. After selecting the "start and end of a week number" the start and end date for the entered week number are calculated.

Date input

Day

Please enter the day, i.e., the day of the month for calculating the week number.

Month

Please enter the month for the week number calculation.

Year

Please enter the year for the week number.

Week number entries / calender week

Week number

Please enter the week number for the calculation of week start and week end.

Year

Please enter the year of the week number for the calculation of week start and week end.

Calculation method

Select the method of week number calculation. Available are "International according to ISO", "North American calculation" and the "Arabic calculation", which are described in detail below.

Calculation methods supported by the Week Number Calculator

International calculation according to ISO

The international ISO 8601 definition of a week is mainly used in European and Asian countries to number weeks:

Weeks start on a Monday and the first week of the year includes 4th of January. This means that up to three days from the previous year may be included in the first week of the current year and up to three days from the current year may be included in the last week of the previous year.

In other words:

  • The first calendar week of a year is the week containing at least four days of the new year.
  • The first calendar week of a year is the week that contains the first Thursday of January.

Two examples of the first week number according to ISO 8601

  • If 1st of January falls on a Wednesday, the first calendar week begins on Monday, 30th December. This first week then contains two days of the old year (Monday and Tuesday) and five days of the new year (Wednesday to Sunday).
  • However, if 1st of January falls on a Friday, the first calendar week starts on Monday, 4th January. This is because the previous week would have contained only three days of the new year (Friday, Saturday, Sunday)

North American calculation of week numbers

In the USA, Canada and most Latin American countries, Australia as well as in Japan, Israel, South Korea and others, a different system is used for numbering weeks.

In contrast to the ISO standard, Sunday is the first day of the week, which then ends with Saturday. In addition, the first calendar week - regardless of the day of the week - always begins on 1st January.

In other words:

  • The first week of a year always starts on 1st of January and ends on the following Saturday.
  • The last week of a year always begins on the last Sunday of the year and ends on 31st December.

Two examples

  • If 1st of January falls on a Wednesday, the first week of the year starts with this Wednesday and consists of four days (Wednesday, Thursday, Friday and Saturday).
  • If 31st December falls on a Tuesday, the last week of the year begins on Sunday, 29th December and consists of three days (Sunday, Monday and Tuesday).

The rule that the first week always begins on 1st of January is more intuitive than in the ISO standard, as the last calendar week always ends with the final week of the year, and the first week always begins with the new year. However, at the turn of the year, there are usually partial weeks of less than seven days, whereas the ISO calendar weeks always consist of whole weeks.

Arabic calculation of week numbers

In the Arab countries, the system for the numbering of weeks is similar to the North American calculation method just described. However, in contrast to this, Saturday, instead of Sunday, is the start of the week. Thus, the week ends on Friday. Apart from that, the first calendar week always starts on 1st of January here as well, regardless of the weekday.

In other words:

  • The first calendar week of a year always starts on 1st January and ends on the following Friday.
  • The last calendar week of a year always begins on the last Saturday of the year and ends on 31st December.

Two examples

  • If 1st of January falls on a Wednesday, the first calendar week starts with this Wednesday and consists of three days (Wednesday, Thursday and Friday).
  • If 31st December falls on a Tuesday, the last calendar week begins on Saturday, 28th December and consists of four days (Saturday, Sunday, Monday and Tuesday).

With the Arabic calculation method as well, the rule that the first week always begins with 1st of January is more intuitive than with the ISO standard, where the last week always ends in the current year and the first week begins with the new year. Likewise, at the turn of the year, there are usually partial weeks of less than seven days, while the ISO calendar weeks continue to consist of whole weeks.

Different definitions

There are many other definitions for numbering weeks.

In some companies, the first week begins in the middle of the year in order to accurately reflect their financial year, which differs from the calendar year.

In the USA, the week starts predominantly with Sunday, but sometimes the start of the first week of the year is defined as in the ISO 8601 definition, i.e., not on 1st of January.

Since the numbering of calendar weeks is not very common in the USA, the counting method used in the calculator was chosen to reflect the way people speak in casual conversation:

"Week one is the first week of the year, and it starts on 1st of January. The weeks are then numbered sequentially, with each following week starting on Sunday.

Source information

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

Last update on August 17, 2022

The pages of the "Week Numbers" category were last editorially reviewed by Michael Mühl on August 17, 2022. They all correspond to the current status.

Previous changes on June 25, 2021