Week number 31 (Week 31) 2021

Updated on by Michael Mühl

Week number 31 of the current year 2021 is defined as follows:

European and Asian calculation

Mainly in Europe and Asia, the international ISO 8601 definition is used for counting calendar weeks:

Week number 31/2021

Monday, August  2, 2021

Sunday, August  8, 2021

ISO-Notation: 2021‑W31

American calculation

In the USA, Canada and most Latin American countries, Australia as well as in Japan, Israel, South Korea and others, the following definition of week 31 applies:

Week number 31/2021

Sunday, July 25, 2021

Saturday, July 31, 2021

The date of the calendar week 31 (Week 31) in the past and coming years

The following table provides an overview of the calendar week 31 for each year. The beginning of the calendar week 31 and its end are shown according to the two most commonly used definitions of calendar weeks worldwide. The first is the international ISO standard for week 31, referred to here as the "European" calculation method. It is mainly used in Europe and Asia. On the other hand, the "American" calculation method for weeks is listed, which is mainly used in North and South America, Australia and e.g. Japan.

Week number 31
Year Calculation
method
Start of week 31End of week 31ISO name
2011 European Monday, August  1, 2011Sunday, August  7, 20112011‑W31
American Sunday, July 24, 2011Saturday, July 30, 2011-
2012 European Monday, July 30, 2012Sunday, August  5, 20122012‑W31
American Sunday, July 29, 2012Saturday, August  4, 2012-
2013 European Monday, July 29, 2013Sunday, August  4, 20132013‑W31
American Sunday, July 28, 2013Saturday, August  3, 2013-
2014 European Monday, July 28, 2014Sunday, August  3, 20142014‑W31
American Sunday, July 27, 2014Saturday, August  2, 2014-
2015 European Monday, July 27, 2015Sunday, August  2, 20152015‑W31
American Sunday, July 26, 2015Saturday, August  1, 2015-
2016 European Monday, August  1, 2016Sunday, August  7, 20162016‑W31
American Sunday, July 24, 2016Saturday, July 30, 2016-
2017 European Monday, July 31, 2017Sunday, August  6, 20172017‑W31
American Sunday, July 30, 2017Saturday, August  5, 2017-
2018 European Monday, July 30, 2018Sunday, August  5, 20182018‑W31
American Sunday, July 29, 2018Saturday, August  4, 2018-
2019 European Monday, July 29, 2019Sunday, August  4, 20192019‑W31
American Sunday, July 28, 2019Saturday, August  3, 2019-
2020 European Monday, July 27, 2020Sunday, August  2, 20202020‑W31
American Sunday, July 26, 2020Saturday, August  1, 2020-
2021 European Monday, August  2, 2021Sunday, August  8, 20212021‑W31
American Sunday, July 25, 2021Saturday, July 31, 2021-
2022 European Monday, August  1, 2022Sunday, August  7, 20222022‑W31
American Sunday, July 24, 2022Saturday, July 30, 2022-
2023 European Monday, July 31, 2023Sunday, August  6, 20232023‑W31
American Sunday, July 30, 2023Saturday, August  5, 2023-
2024 European Monday, July 29, 2024Sunday, August  4, 20242024‑W31
American Sunday, July 28, 2024Saturday, August  3, 2024-
2025 European Monday, July 28, 2025Sunday, August  3, 20252025‑W31
American Sunday, July 27, 2025Saturday, August  2, 2025-
2026 European Monday, July 27, 2026Sunday, August  2, 20262026‑W31
American Sunday, July 26, 2026Saturday, August  1, 2026-
2027 European Monday, August  2, 2027Sunday, August  8, 20272027‑W31
American Sunday, July 25, 2027Saturday, July 31, 2027-
2028 European Monday, July 31, 2028Sunday, August  6, 20282028‑W31
American Sunday, July 23, 2028Saturday, July 29, 2028-
2029 European Monday, July 30, 2029Sunday, August  5, 20292029‑W31
American Sunday, July 29, 2029Saturday, August  4, 2029-
2030 European Monday, July 29, 2030Sunday, August  4, 20302030‑W31
American Sunday, July 28, 2030Saturday, August  3, 2030-
2031 European Monday, July 28, 2031Sunday, August  3, 20312031‑W31
American Sunday, July 27, 2031Saturday, August  2, 2031-

Determine week 31 or other calendar weeks in the calculator

In the calendar week calculator, the entry for the European ISO calendar week 31 is preset. Of course, you can also enter other values here to determine the date of the beginning of the week or the end of the week.

Calendar week calculator for other years

For calendar years further back or in the future, you will find the beginning and end of the corresponding calendar week in the Calendar week calculator.

 

Source information

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

Last update on June 19, 2021

The pages of the "Week Numbers" category were last editorially reviewed by Michael Mühl on June 19, 2021. They all correspond to the current status.

Previous changes on June 25, 2020