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:
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:
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 Method | Start of Week 39 | End of Week 39 | ISO Name |
| 2020 | European | Monday, September 21, 2020 | Sunday, September 27, 2020 | 2020‑W39 |
| American | Sunday, September 20, 2020 | Saturday, September 26, 2020 | - | |
| 2021 | European | Monday, September 27, 2021 | Sunday, October 3, 2021 | 2021‑W39 |
| American | Sunday, September 19, 2021 | Saturday, September 25, 2021 | - | |
| 2022 | European | Monday, September 26, 2022 | Sunday, October 2, 2022 | 2022‑W39 |
| American | Sunday, September 18, 2022 | Saturday, September 24, 2022 | - | |
| 2023 | European | Monday, September 25, 2023 | Sunday, October 1, 2023 | 2023‑W39 |
| American | Sunday, September 24, 2023 | Saturday, September 30, 2023 | - | |
| 2024 | European | Monday, September 23, 2024 | Sunday, September 29, 2024 | 2024‑W39 |
| American | Sunday, September 22, 2024 | Saturday, September 28, 2024 | - | |
| 2025 | European | Monday, September 22, 2025 | Sunday, September 28, 2025 | 2025‑W39 |
| American | Sunday, September 21, 2025 | Saturday, September 27, 2025 | - | |
| 2026 | European | Monday, September 21, 2026 | Sunday, September 27, 2026 | 2026‑W39 |
| American | Sunday, September 20, 2026 | Saturday, 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
- Publication of the Week Number Calculator
- Editorial revision of all texts in this category