ISO week 2026-W23

Week 23, 2026

Monday, June 1 – Sunday, June 7, 2026

ISO week 23 of 2026 (2026-W23) runs from Monday, June 1, 2026 to Sunday, June 7, 2026.

This week ended 19 weeks ago. The current week is week 42, 2026.

The 7 days of week 23

Dates in week 23, 2026
Day	Date	Day of year	US week	ISO date
Monday	June 1, 2026	152 of 365	23	2026-W23-1
Tuesday	June 2, 2026	153 of 365	23	2026-W23-2
Wednesday	June 3, 2026	154 of 365	23	2026-W23-3
Thursday	June 4, 2026	155 of 365	23	2026-W23-4
Friday	June 5, 2026	156 of 365	23	2026-W23-5
Saturday	June 6, 2026	157 of 365	23	2026-W23-6
Sunday	June 7, 2026	158 of 365	24	2026-W23-7

Week 23 at a glance

ISO code: 2026-W23 (Monday is 2026-W23-1, Sunday is 2026-W23-7)
Month: June
Quarter: Q2 of 2026
Day of year: Days 152–158 of 365
US week number: Monday–Saturday: US week 23; Sunday: US week 24 (Sunday-start weeks, week 1 contains January 1)
Even or odd: Week 23 is an odd week
Weeks left: After this week, 30 ISO weeks remain in 2026 (53 weeks in total)
Year progress: By Sunday, 43% of 2026 has passed

Holidays and key dates

There are no US federal holidays, daylight saving time changes or quarter starts in week 23 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 23, 2026

What are the dates of week 23 in 2026?

Week 23 of 2026 starts on Monday, June 1, 2026 and ends on Sunday, June 7, 2026.

What month is week 23 of 2026?

Week 23 falls in June. By the Thursday rule that ISO 8601 uses for years and quarters, it counts as a June week.

How do I get week 23 of 2026 in Excel or Google Sheets?

=ISOWEEKNUM(DATE(2026,6,1)) returns 23. To go the other way, =DATE(2026,1,4)-WEEKDAY(DATE(2026,1,4),2)+1+(23-1)*7 returns the Monday, June 1, 2026.