ISO week 2027-W18

Week 18, 2027

Monday, May 3 – Sunday, May 9, 2027

ISO week 18 of 2027 (2027-W18) runs from Monday, May 3, 2027 to Sunday, May 9, 2027.

This week starts 29 weeks from now. The current week is week 42, 2026.

The 7 days of week 18

Dates in week 18, 2027
Day	Date	Day of year	US week	ISO date
Monday	May 3, 2027	123 of 365	19	2027-W18-1
Tuesday	May 4, 2027	124 of 365	19	2027-W18-2
Wednesday	May 5, 2027	125 of 365	19	2027-W18-3
Thursday	May 6, 2027	126 of 365	19	2027-W18-4
Friday	May 7, 2027	127 of 365	19	2027-W18-5
Saturday	May 8, 2027	128 of 365	19	2027-W18-6
Sunday	May 9, 2027	129 of 365	20	2027-W18-7

Week 18 at a glance

ISO code: 2027-W18 (Monday is 2027-W18-1, Sunday is 2027-W18-7)
Month: May
Quarter: Q2 of 2027
Day of year: Days 123–129 of 365
US week number: Monday–Saturday: US week 19; Sunday: US week 20 (Sunday-start weeks, week 1 contains January 1)
Even or odd: Week 18 is an even week
Weeks left: After this week, 34 ISO weeks remain in 2027 (52 weeks in total)
Year progress: By Sunday, 35% of 2027 has passed

Holidays and key dates

There are no US federal holidays, daylight saving time changes or quarter starts in week 18 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 18, 2027

What are the dates of week 18 in 2027?

Week 18 of 2027 starts on Monday, May 3, 2027 and ends on Sunday, May 9, 2027.

What month is week 18 of 2027?

Week 18 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 18 of 2027 in Excel or Google Sheets?

=ISOWEEKNUM(DATE(2027,5,3)) returns 18. To go the other way, =DATE(2027,1,4)-WEEKDAY(DATE(2027,1,4),2)+1+(18-1)*7 returns the Monday, May 3, 2027.