ISO week 2026-W20

Week 20, 2026

Monday, May 11 – Sunday, May 17, 2026

ISO week 20 of 2026 (2026-W20) runs from Monday, May 11, 2026 to Sunday, May 17, 2026.

This week ended 22 weeks ago. The current week is week 42, 2026.

The 7 days of week 20

Dates in week 20, 2026
Day	Date	Day of year	US week	ISO date
Monday	May 11, 2026	131 of 365	20	2026-W20-1
Tuesday	May 12, 2026	132 of 365	20	2026-W20-2
Wednesday	May 13, 2026	133 of 365	20	2026-W20-3
Thursday	May 14, 2026	134 of 365	20	2026-W20-4
Friday	May 15, 2026	135 of 365	20	2026-W20-5
Saturday	May 16, 2026	136 of 365	20	2026-W20-6
Sunday	May 17, 2026	137 of 365	21	2026-W20-7

Week 20 at a glance

ISO code: 2026-W20 (Monday is 2026-W20-1, Sunday is 2026-W20-7)
Month: May
Quarter: Q2 of 2026
Day of year: Days 131–137 of 365
US week number: Monday–Saturday: US week 20; Sunday: US week 21 (Sunday-start weeks, week 1 contains January 1)
Even or odd: Week 20 is an even week
Weeks left: After this week, 33 ISO weeks remain in 2026 (53 weeks in total)
Year progress: By Sunday, 38% of 2026 has passed

Holidays and key dates

There are no US federal holidays, daylight saving time changes or quarter starts in week 20 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 20, 2026

What are the dates of week 20 in 2026?

Week 20 of 2026 starts on Monday, May 11, 2026 and ends on Sunday, May 17, 2026.

What month is week 20 of 2026?

Week 20 falls in May. By the Thursday rule that ISO 8601 uses for years and quarters, it counts as a May week.

How do I get week 20 of 2026 in Excel or Google Sheets?

=ISOWEEKNUM(DATE(2026,5,11)) returns 20. To go the other way, =DATE(2026,1,4)-WEEKDAY(DATE(2026,1,4),2)+1+(20-1)*7 returns the Monday, May 11, 2026.