ISO week 2026-W09

Week 9, 2026

Monday, February 23 – Sunday, March 1, 2026

ISO week 9 of 2026 (2026-W09) runs from Monday, February 23, 2026 to Sunday, March 1, 2026.

This week ended 33 weeks ago. The current week is week 42, 2026.

The 7 days of week 9

Dates in week 9, 2026
Day	Date	Day of year	US week	ISO date
Monday	February 23, 2026	54 of 365	9	2026-W09-1
Tuesday	February 24, 2026	55 of 365	9	2026-W09-2
Wednesday	February 25, 2026	56 of 365	9	2026-W09-3
Thursday	February 26, 2026	57 of 365	9	2026-W09-4
Friday	February 27, 2026	58 of 365	9	2026-W09-5
Saturday	February 28, 2026	59 of 365	9	2026-W09-6
Sunday	March 1, 2026	60 of 365	10	2026-W09-7

Week 9 at a glance

ISO code: 2026-W09 (Monday is 2026-W09-1, Sunday is 2026-W09-7)
Month: February and March
Quarter: Q1 of 2026
Day of year: Days 54–60 of 365
US week number: Monday–Saturday: US week 9; Sunday: US week 10 (Sunday-start weeks, week 1 contains January 1)
Even or odd: Week 9 is an odd week
Weeks left: After this week, 44 ISO weeks remain in 2026 (53 weeks in total)
Year progress: By Sunday, 16% of 2026 has passed

Holidays and key dates

There are no US federal holidays, daylight saving time changes or quarter starts in week 9 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 9, 2026

What are the dates of week 9 in 2026?

Week 9 of 2026 starts on Monday, February 23, 2026 and ends on Sunday, March 1, 2026.

What month is week 9 of 2026?

Week 9 falls in February and March. By the Thursday rule that ISO 8601 uses for years and quarters, it counts as a February week.

How do I get week 9 of 2026 in Excel or Google Sheets?

=ISOWEEKNUM(DATE(2026,2,23)) returns 9. To go the other way, =DATE(2026,1,4)-WEEKDAY(DATE(2026,1,4),2)+1+(9-1)*7 returns the Monday, February 23, 2026.