Week 39 2023

Week 39 2023
Week Number 39 in 2023

Week Numbers ﹣ Week 39 2023

Week Number 39 of the current year 2023 is defined as follows.

European and Asian calculation

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

Monday, September 25, 2023 – Sunday, October 1, 2023

ISO: 2023‑W39
Week Number 2023

American calculation

In the USA, Canada and most Latin American countries, Australia, Japan, Israel, South Korea and others, the following definition of Week 39 applies:

Week Number 39/2023

Sunday, September 24, 2023

Saturday, September 30, 2023


The date of the calendar Week  39 and other years

The following table provides an overview of the calendar Week 39 for each year. The beginning of the calendar Week 39 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 39, 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 Japan.

Week Number 39
Year Calculation
Start of Week 39End of Week 39ISO Name
2020 European Monday, September 21, 2020Sunday, September 27, 20202020‑W39
American Sunday, September 20, 2020Saturday, September 26, 2020-
2021 European Monday, September 27, 2021Sunday, October 3, 20212021‑W39
American Sunday, September 19, 2021Saturday, September 25, 2021-
2022 European Monday, September 26, 2022Sunday, October 2, 20222022‑W39
American Sunday, September 18, 2022Saturday, September 24, 2022-
2023 European Monday, September 25, 2023Sunday, October 1, 20232023‑W39
American Sunday, September 24, 2023Saturday, September 30, 2023-
2024 European Monday, September 23, 2024Sunday, September 29, 20242024‑W39
American Sunday, September 22, 2024Saturday, September 28, 2024-
2025 European Monday, September 22, 2025Sunday, September 28, 20252025‑W39
American Sunday, September 21, 2025Saturday, September 27, 2025-
2026 European Monday, September 21, 2026Sunday, September 27, 20262026‑W39
American Sunday, September 20, 2026Saturday, September 26, 2026-

Determine Week 39 or other calendar weeks in the calculator

In the Calendar Week Calculator, the entry for the European ISO calendar Week 39 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 1, 2023

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

Previous changes on June 25, 2021