All 52 ISO 8601 weeks with Monday-to-Sunday dates
The year 2023 has 52 weeks according to the ISO 8601 standard. Below is a complete list of every week with its exact Monday (start) and Sunday (end) dates. Each row links to the full week details page.
January 1, 2023 is in Week 52 of 2022. The ISO week number for Jan 1 depends on which day of the week Jan 1 falls on.
December 31, 2023 is in Week 52 of 2023.
2023 is not a leap year and has 365 days.
2023 has 52 weeks according to ISO 8601. This is the standard 52-week year length.
Week 1 of 2023 starts on January 2, 2023 and ends on January 8, 2023.
ISO 8601 week numbers are determined by the year that contains Thursday. Week 1 of 2023 is the week containing January 4, 2023. Each subsequent week is numbered sequentially.