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When is week 18?

Week 18 of 2027: May 3 – May 9

Mon, May 3 – Sun, May 9, 2027

Week 18 of 2026 ended on Sunday, May 3, 2026, so this is next year's. It starts in 215 days.

Week 18 of 2027 day by day

Week 18 of 2027 falls in May, in Q2. Its Monday is day 123 of 2027. In US-style numbering (weeks starting on Sunday, week 1 containing January 1, like WEEKNUM in Excel) that Monday is in week 19.

Days of ISO week 18, 2027
DayDateHolidays and observances
MondayMay 3, 2027—
TuesdayMay 4, 2027—
WednesdayMay 5, 2027Cinco de Mayo
ThursdayMay 6, 2027—
FridayMay 7, 2027—
SaturdayMay 8, 2027—
SundayMay 9, 2027Mother's Day

Week 18 by year

ISO week 18, 2024–2032
YearMondaySunday
2024Mon, Apr 29Sun, May 5
2025Mon, Apr 28Sun, May 4
2026Mon, Apr 27Sun, May 3
2027Mon, May 3Sun, May 9
2028Mon, May 1Sun, May 7
2029Mon, Apr 30Sun, May 6
2030Mon, Apr 29Sun, May 5
2031Mon, Apr 28Sun, May 4
2032Mon, Apr 26Sun, May 2

More week numbers

Frequently asked questions

When is week 18 of 2027?

From Monday, May 3, 2027 to Sunday, May 9, 2027.

How many days until week 18?

215 days, counting from today to Monday, the first day of the week.

Why can week 1 start in December?

ISO week 1 is the week containing the year's first Thursday, so it can begin as early as December 29 of the previous year.