ISO week 2026-W05

Week 5, 2026

Monday, January 26 – Sunday, February 1, 2026

ISO week 5 of 2026 (2026-W05) runs from Monday, January 26, 2026 to Sunday, February 1, 2026.

This week ended 37 weeks ago. The current week is week 42, 2026.

The 7 days of week 5

Dates in week 5, 2026
Day	Date	Day of year	US week	ISO date
Monday	January 26, 2026	26 of 365	5	2026-W05-1
Tuesday	January 27, 2026	27 of 365	5	2026-W05-2
Wednesday	January 28, 2026	28 of 365	5	2026-W05-3
Thursday	January 29, 2026	29 of 365	5	2026-W05-4
Friday	January 30, 2026	30 of 365	5	2026-W05-5
Saturday	January 31, 2026	31 of 365	5	2026-W05-6
Sunday	February 1, 2026	32 of 365	6	2026-W05-7

Week 5 at a glance

ISO code: 2026-W05 (Monday is 2026-W05-1, Sunday is 2026-W05-7)
Month: January and February
Quarter: Q1 of 2026
Day of year: Days 26–32 of 365
US week number: Monday–Saturday: US week 5; Sunday: US week 6 (Sunday-start weeks, week 1 contains January 1)
Even or odd: Week 5 is an odd week
Weeks left: After this week, 48 ISO weeks remain in 2026 (53 weeks in total)
Year progress: By Sunday, 9% of 2026 has passed

Holidays and key dates

There are no US federal holidays, daylight saving time changes or quarter starts in week 5 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 5, 2026

What are the dates of week 5 in 2026?

Week 5 of 2026 starts on Monday, January 26, 2026 and ends on Sunday, February 1, 2026.

What month is week 5 of 2026?

Week 5 falls in January and February. By the Thursday rule that ISO 8601 uses for years and quarters, it counts as a January week.

How do I get week 5 of 2026 in Excel or Google Sheets?

=ISOWEEKNUM(DATE(2026,1,26)) returns 5. To go the other way, =DATE(2026,1,4)-WEEKDAY(DATE(2026,1,4),2)+1+(5-1)*7 returns the Monday, January 26, 2026.