ISO week 2027-W21

Week 21, 2027

Monday, May 24 – Sunday, May 30, 2027

ISO week 21 of 2027 (2027-W21) runs from Monday, May 24, 2027 to Sunday, May 30, 2027.

This week starts 32 weeks from now. The current week is week 42, 2026.

The 7 days of week 21

Dates in week 21, 2027
Day	Date	Day of year	US week	ISO date
Monday	May 24, 2027	144 of 365	22	2027-W21-1
Tuesday	May 25, 2027	145 of 365	22	2027-W21-2
Wednesday	May 26, 2027	146 of 365	22	2027-W21-3
Thursday	May 27, 2027	147 of 365	22	2027-W21-4
Friday	May 28, 2027	148 of 365	22	2027-W21-5
Saturday	May 29, 2027	149 of 365	22	2027-W21-6
Sunday	May 30, 2027	150 of 365	23	2027-W21-7

Week 21 at a glance

ISO code: 2027-W21 (Monday is 2027-W21-1, Sunday is 2027-W21-7)
Month: May
Quarter: Q2 of 2027
Day of year: Days 144–150 of 365
US week number: Monday–Saturday: US week 22; Sunday: US week 23 (Sunday-start weeks, week 1 contains January 1)
Even or odd: Week 21 is an odd week
Weeks left: After this week, 31 ISO weeks remain in 2027 (52 weeks in total)
Year progress: By Sunday, 41% of 2027 has passed

Holidays and key dates

There are no US federal holidays, daylight saving time changes or quarter starts in week 21 of 2027.

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 21, 2027

What are the dates of week 21 in 2027?

Week 21 of 2027 starts on Monday, May 24, 2027 and ends on Sunday, May 30, 2027.

What month is week 21 of 2027?

Week 21 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 21 of 2027 in Excel or Google Sheets?

=ISOWEEKNUM(DATE(2027,5,24)) returns 21. To go the other way, =DATE(2027,1,4)-WEEKDAY(DATE(2027,1,4),2)+1+(21-1)*7 returns the Monday, May 24, 2027.