ISO week 2026-W50

Week 50, 2026

Monday, December 7 – Sunday, December 13, 2026

ISO week 50 of 2026 (2026-W50) runs from Monday, December 7, 2026 to Sunday, December 13, 2026.

This week starts 8 weeks from now. The current week is week 42, 2026.

The 7 days of week 50

Dates in week 50, 2026
Day	Date	Day of year	US week	ISO date
Monday	December 7, 2026	341 of 365	50	2026-W50-1
Tuesday	December 8, 2026	342 of 365	50	2026-W50-2
Wednesday	December 9, 2026	343 of 365	50	2026-W50-3
Thursday	December 10, 2026	344 of 365	50	2026-W50-4
Friday	December 11, 2026	345 of 365	50	2026-W50-5
Saturday	December 12, 2026	346 of 365	50	2026-W50-6
Sunday	December 13, 2026	347 of 365	51	2026-W50-7

Week 50 at a glance

ISO code: 2026-W50 (Monday is 2026-W50-1, Sunday is 2026-W50-7)
Month: December
Quarter: Q4 of 2026
Day of year: Days 341–347 of 365
US week number: Monday–Saturday: US week 50; Sunday: US week 51 (Sunday-start weeks, week 1 contains January 1)
Even or odd: Week 50 is an even week
Weeks left: After this week, 3 ISO weeks remain in 2026 (53 weeks in total)
Year progress: By Sunday, 95% of 2026 has passed

Holidays and key dates

There are no US federal holidays, daylight saving time changes or quarter starts in week 50 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 50, 2026

What are the dates of week 50 in 2026?

Week 50 of 2026 starts on Monday, December 7, 2026 and ends on Sunday, December 13, 2026.

What month is week 50 of 2026?

Week 50 falls in December. By the Thursday rule that ISO 8601 uses for years and quarters, it counts as a December week.

How do I get week 50 of 2026 in Excel or Google Sheets?

=ISOWEEKNUM(DATE(2026,12,7)) returns 50. To go the other way, =DATE(2026,1,4)-WEEKDAY(DATE(2026,1,4),2)+1+(50-1)*7 returns the Monday, December 7, 2026.