ISO week 2026-W41

Week 41, 2026

Monday, October 5 – Sunday, October 11, 2026

ISO week 41 of 2026 (2026-W41) runs from Monday, October 5, 2026 to Sunday, October 11, 2026.

This week ended 1 week ago. The current week is week 42, 2026.

The 7 days of week 41

Dates in week 41, 2026
Day	Date	Day of year	US week	ISO date
Monday	October 5, 2026	278 of 365	41	2026-W41-1
Tuesday	October 6, 2026	279 of 365	41	2026-W41-2
Wednesday	October 7, 2026	280 of 365	41	2026-W41-3
Thursday	October 8, 2026	281 of 365	41	2026-W41-4
Friday	October 9, 2026	282 of 365	41	2026-W41-5
Saturday	October 10, 2026	283 of 365	41	2026-W41-6
Sunday	October 11, 2026	284 of 365	42	2026-W41-7

Week 41 at a glance

ISO code: 2026-W41 (Monday is 2026-W41-1, Sunday is 2026-W41-7)
Month: October
Quarter: Q4 of 2026
Day of year: Days 278–284 of 365
US week number: Monday–Saturday: US week 41; Sunday: US week 42 (Sunday-start weeks, week 1 contains January 1)
Even or odd: Week 41 is an odd week
Weeks left: After this week, 12 ISO weeks remain in 2026 (53 weeks in total)
Year progress: By Sunday, 78% of 2026 has passed

Holidays and key dates

There are no US federal holidays, daylight saving time changes or quarter starts in week 41 of 2026.

Week numbers follow ISO 8601: weeks start on Monday and week 1 contains the first Thursday of the year. US weeks start on Sunday, with week 1 containing January 1.

Questions about week 41, 2026

What are the dates of week 41 in 2026?

Week 41 of 2026 starts on Monday, October 5, 2026 and ends on Sunday, October 11, 2026.

What month is week 41 of 2026?

Week 41 falls in October. By the Thursday rule that ISO 8601 uses for years and quarters, it counts as a October week.

How do I get week 41 of 2026 in Excel or Google Sheets?

=ISOWEEKNUM(DATE(2026,10,5)) returns 41. To go the other way, =DATE(2026,1,4)-WEEKDAY(DATE(2026,1,4),2)+1+(41-1)*7 returns the Monday, October 5, 2026.