ISO week 2026-W43

Week 43, 2026

Monday, October 19 – Sunday, October 25, 2026

ISO week 43 of 2026 (2026-W43) runs from Monday, October 19, 2026 to Sunday, October 25, 2026.

This week starts 1 week from now. The current week is week 42, 2026.

The 7 days of week 43

Dates in week 43, 2026
Day	Date	Day of year	US week	ISO date
Monday	October 19, 2026	292 of 365	43	2026-W43-1
Tuesday	October 20, 2026	293 of 365	43	2026-W43-2
Wednesday	October 21, 2026	294 of 365	43	2026-W43-3
Thursday	October 22, 2026	295 of 365	43	2026-W43-4
Friday	October 23, 2026	296 of 365	43	2026-W43-5
Saturday	October 24, 2026	297 of 365	43	2026-W43-6
Sunday	October 25, 2026	298 of 365	44	2026-W43-7

Week 43 at a glance

ISO code: 2026-W43 (Monday is 2026-W43-1, Sunday is 2026-W43-7)
Month: October
Quarter: Q4 of 2026
Day of year: Days 292–298 of 365
US week number: Monday–Saturday: US week 43; Sunday: US week 44 (Sunday-start weeks, week 1 contains January 1)
Even or odd: Week 43 is an odd week
Weeks left: After this week, 10 ISO weeks remain in 2026 (53 weeks in total)
Year progress: By Sunday, 82% of 2026 has passed

Holidays and key dates

Sunday, October 25: Summer time ends in the EU and UK (clocks go back one hour)

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 43, 2026

What are the dates of week 43 in 2026?

Week 43 of 2026 starts on Monday, October 19, 2026 and ends on Sunday, October 25, 2026.

What month is week 43 of 2026?

Week 43 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 43 of 2026 in Excel or Google Sheets?

=ISOWEEKNUM(DATE(2026,10,19)) returns 43. To go the other way, =DATE(2026,1,4)-WEEKDAY(DATE(2026,1,4),2)+1+(43-1)*7 returns the Monday, October 19, 2026.