Time calendar
It’s week 41 of 2026
ISO week 41 runs from October 5 through October 11, 2026.
W41
Oct 5–Oct 11, 2026
Week startsMonday
Week endsSunday
ConventionISO 8601
Source & method: ISO 8601 week-date rules; weeks begin Monday and week 1 contains the year’s first Thursday.
About this calendar
A clearer way to see week number.
Find the current ISO week and its exact date range.
ISO week numbering starts weeks on Monday, and week 1 is the week containing the year’s first Thursday. This can place the first days of January in the previous ISO week-year.
Use the displayed date range when sharing a week number internationally; not every organization follows ISO 8601.
Read our data and calculation methods for coverage and accuracy limits. If a date or result looks wrong, report a calendar error.
Good to know
Why is January 1 sometimes in week 52 or 53?
ISO weeks belong to the year containing that week’s Thursday.
Does the United States always use ISO weeks?
No. Many U.S. calendars use Sunday-starting weeks, so confirm the convention.
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