Week 1 2023

Week 1 2023
Week Number 1 in 2023

Week Numbers ﹣ Week 1 2023

Week Number 1 of the next 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, January 2, 2023 – Sunday, January 8, 2023

ISO: 2023‑W01
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 1 applies:

Week Number 1/2023

Sunday, January 1, 2023

Saturday, January 7, 2023


The date of the calendar Week Week 1 and other years

The following table provides an overview of the calendar Week 1 for each year. The beginning of the calendar Week 1 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 1, 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 1
Year Calculation
Start of Week 1End of Week 1ISO Name
2020 European Monday, December 30, 2019Sunday, January 5, 20202020‑W01
American Wednesday, January 1, 2020Saturday, January 4, 2020-
2021 European Monday, January 4, 2021Sunday, January 10, 20212021‑W01
American Friday, January 1, 2021Saturday, January 2, 2021-
2022 European Monday, January 3, 2022Sunday, January 9, 20222022‑W01
American Saturday, January 1, 2022Saturday, January 1, 2022-
2023 European Monday, January 2, 2023Sunday, January 8, 20232023‑W01
American Sunday, January 1, 2023Saturday, January 7, 2023-
2024 European Monday, January 1, 2024Sunday, January 7, 20242024‑W01
American Monday, January 1, 2024Saturday, January 6, 2024-
2025 European Monday, December 30, 2024Sunday, January 5, 20252025‑W01
American Wednesday, January 1, 2025Saturday, January 4, 2025-
2026 European Monday, December 29, 2025Sunday, January 4, 20262026‑W01
American Thursday, January 1, 2026Saturday, January 3, 2026-

Determine Week 1 or other calendar weeks in the calculator

In the Calendar Week Calculator, the entry for the European ISO calendar Week 1 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 December 3, 2022

The pages of the 'Week Numbers' category were last editorially reviewed by Michael Mühl on December 3, 2022. They all correspond to the current status.

Previous changes on June 25, 2021