ISO week 2026-W42

Week 42, 2026

Monday, October 12 – Sunday, October 18, 2026

ISO week 42 of 2026 (2026-W42) runs from Monday, October 12, 2026 to Sunday, October 18, 2026.

This is the current week. Today is Tuesday, October 13, 2026.

The 7 days of week 42

Dates in week 42, 2026
Day	Date	Day of year	US week	ISO date
Monday	October 12, 2026	285 of 365	42	2026-W42-1
Tuesday	October 13, 2026	286 of 365	42	2026-W42-2
Wednesday	October 14, 2026	287 of 365	42	2026-W42-3
Thursday	October 15, 2026	288 of 365	42	2026-W42-4
Friday	October 16, 2026	289 of 365	42	2026-W42-5
Saturday	October 17, 2026	290 of 365	42	2026-W42-6
Sunday	October 18, 2026	291 of 365	43	2026-W42-7

Week 42 at a glance

ISO code: 2026-W42 (Monday is 2026-W42-1, Sunday is 2026-W42-7)
Month: October
Quarter: Q4 of 2026
Day of year: Days 285–291 of 365
US week number: Monday–Saturday: US week 42; Sunday: US week 43 (Sunday-start weeks, week 1 contains January 1)
Even or odd: Week 42 is an even week
Weeks left: After this week, 11 ISO weeks remain in 2026 (53 weeks in total)
Year progress: By Sunday, 80% of 2026 has passed

Holidays and key dates

Monday, October 12: Columbus Day (Indigenous Peoples' Day) – US federal holiday

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 42, 2026

What are the dates of week 42 in 2026?

Week 42 of 2026 starts on Monday, October 12, 2026 and ends on Sunday, October 18, 2026.

What month is week 42 of 2026?

Week 42 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 42 of 2026 in Excel or Google Sheets?

=ISOWEEKNUM(DATE(2026,10,12)) returns 42. To go the other way, =DATE(2026,1,4)-WEEKDAY(DATE(2026,1,4),2)+1+(42-1)*7 returns the Monday, October 12, 2026.