ISO week 2027-W12

Week 12, 2027

Monday, March 22 – Sunday, March 28, 2027

ISO week 12 of 2027 (2027-W12) runs from Monday, March 22, 2027 to Sunday, March 28, 2027.

This week starts 23 weeks from now. The current week is week 42, 2026.

The 7 days of week 12

Dates in week 12, 2027
Day	Date	Day of year	US week	ISO date
Monday	March 22, 2027	81 of 365	13	2027-W12-1
Tuesday	March 23, 2027	82 of 365	13	2027-W12-2
Wednesday	March 24, 2027	83 of 365	13	2027-W12-3
Thursday	March 25, 2027	84 of 365	13	2027-W12-4
Friday	March 26, 2027	85 of 365	13	2027-W12-5
Saturday	March 27, 2027	86 of 365	13	2027-W12-6
Sunday	March 28, 2027	87 of 365	14	2027-W12-7

Week 12 at a glance

ISO code: 2027-W12 (Monday is 2027-W12-1, Sunday is 2027-W12-7)
Month: March
Quarter: Q1 of 2027
Day of year: Days 81–87 of 365
US week number: Monday–Saturday: US week 13; Sunday: US week 14 (Sunday-start weeks, week 1 contains January 1)
Even or odd: Week 12 is an even week
Weeks left: After this week, 40 ISO weeks remain in 2027 (52 weeks in total)
Year progress: By Sunday, 24% of 2027 has passed

Holidays and key dates

Sunday, March 28: Summer time starts in the EU and UK (clocks go forward 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 12, 2027

What are the dates of week 12 in 2027?

Week 12 of 2027 starts on Monday, March 22, 2027 and ends on Sunday, March 28, 2027.

What month is week 12 of 2027?

Week 12 falls in March. By the Thursday rule that ISO 8601 uses for years and quarters, it counts as a March week.

How do I get week 12 of 2027 in Excel or Google Sheets?

=ISOWEEKNUM(DATE(2027,3,22)) returns 12. To go the other way, =DATE(2027,1,4)-WEEKDAY(DATE(2027,1,4),2)+1+(12-1)*7 returns the Monday, March 22, 2027.