ISO week 2027-W42

Week 42, 2027

Monday, October 18 – Sunday, October 24, 2027

ISO week 42 of 2027 (2027-W42) runs from Monday, October 18, 2027 to Sunday, October 24, 2027.

This week starts 53 weeks from now. The current week is week 42, 2026.

The 7 days of week 42

Dates in week 42, 2027
Day	Date	Day of year	US week	ISO date
Monday	October 18, 2027	291 of 365	43	2027-W42-1
Tuesday	October 19, 2027	292 of 365	43	2027-W42-2
Wednesday	October 20, 2027	293 of 365	43	2027-W42-3
Thursday	October 21, 2027	294 of 365	43	2027-W42-4
Friday	October 22, 2027	295 of 365	43	2027-W42-5
Saturday	October 23, 2027	296 of 365	43	2027-W42-6
Sunday	October 24, 2027	297 of 365	44	2027-W42-7

Week 42 at a glance

ISO code: 2027-W42 (Monday is 2027-W42-1, Sunday is 2027-W42-7)
Month: October
Quarter: Q4 of 2027
Day of year: Days 291–297 of 365
US week number: Monday–Saturday: US week 43; Sunday: US week 44 (Sunday-start weeks, week 1 contains January 1)
Even or odd: Week 42 is an even week
Weeks left: After this week, 10 ISO weeks remain in 2027 (52 weeks in total)
Year progress: By Sunday, 81% of 2027 has passed

Holidays and key dates

There are no US federal holidays, daylight saving time changes or quarter starts in week 42 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 42, 2027

What are the dates of week 42 in 2027?

Week 42 of 2027 starts on Monday, October 18, 2027 and ends on Sunday, October 24, 2027.

What month is week 42 of 2027?

Week 42 falls in October. By the Thursday rule that ISO 8601 uses for years and quarters, it counts as a October week.

How do I get week 42 of 2027 in Excel or Google Sheets?

=ISOWEEKNUM(DATE(2027,10,18)) returns 42. To go the other way, =DATE(2027,1,4)-WEEKDAY(DATE(2027,1,4),2)+1+(42-1)*7 returns the Monday, October 18, 2027.