ISO week 2026-W15

Week 15, 2026

Monday, April 6 – Sunday, April 12, 2026

ISO week 15 of 2026 (2026-W15) runs from Monday, April 6, 2026 to Sunday, April 12, 2026.

This week ended 27 weeks ago. The current week is week 42, 2026.

The 7 days of week 15

Dates in week 15, 2026
Day	Date	Day of year	US week	ISO date
Monday	April 6, 2026	96 of 365	15	2026-W15-1
Tuesday	April 7, 2026	97 of 365	15	2026-W15-2
Wednesday	April 8, 2026	98 of 365	15	2026-W15-3
Thursday	April 9, 2026	99 of 365	15	2026-W15-4
Friday	April 10, 2026	100 of 365	15	2026-W15-5
Saturday	April 11, 2026	101 of 365	15	2026-W15-6
Sunday	April 12, 2026	102 of 365	16	2026-W15-7

Week 15 at a glance

ISO code: 2026-W15 (Monday is 2026-W15-1, Sunday is 2026-W15-7)
Month: April
Quarter: Q2 of 2026
Day of year: Days 96–102 of 365
US week number: Monday–Saturday: US week 15; Sunday: US week 16 (Sunday-start weeks, week 1 contains January 1)
Even or odd: Week 15 is an odd week
Weeks left: After this week, 38 ISO weeks remain in 2026 (53 weeks in total)
Year progress: By Sunday, 28% of 2026 has passed

Holidays and key dates

There are no US federal holidays, daylight saving time changes or quarter starts in week 15 of 2026.

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 15, 2026

What are the dates of week 15 in 2026?

Week 15 of 2026 starts on Monday, April 6, 2026 and ends on Sunday, April 12, 2026.

What month is week 15 of 2026?

Week 15 falls in April. By the Thursday rule that ISO 8601 uses for years and quarters, it counts as a April week.

How do I get week 15 of 2026 in Excel or Google Sheets?

=ISOWEEKNUM(DATE(2026,4,6)) returns 15. To go the other way, =DATE(2026,1,4)-WEEKDAY(DATE(2026,1,4),2)+1+(15-1)*7 returns the Monday, April 6, 2026.