ISO week 2026-W03

Week 3, 2026

Monday, January 12 – Sunday, January 18, 2026

ISO week 3 of 2026 (2026-W03) runs from Monday, January 12, 2026 to Sunday, January 18, 2026.

This week ended 39 weeks ago. The current week is week 42, 2026.

The 7 days of week 3

Dates in week 3, 2026
Day	Date	Day of year	US week	ISO date
Monday	January 12, 2026	12 of 365	3	2026-W03-1
Tuesday	January 13, 2026	13 of 365	3	2026-W03-2
Wednesday	January 14, 2026	14 of 365	3	2026-W03-3
Thursday	January 15, 2026	15 of 365	3	2026-W03-4
Friday	January 16, 2026	16 of 365	3	2026-W03-5
Saturday	January 17, 2026	17 of 365	3	2026-W03-6
Sunday	January 18, 2026	18 of 365	4	2026-W03-7

Week 3 at a glance

ISO code: 2026-W03 (Monday is 2026-W03-1, Sunday is 2026-W03-7)
Month: January
Quarter: Q1 of 2026
Day of year: Days 12–18 of 365
US week number: Monday–Saturday: US week 3; Sunday: US week 4 (Sunday-start weeks, week 1 contains January 1)
Even or odd: Week 3 is an odd week
Weeks left: After this week, 50 ISO weeks remain in 2026 (53 weeks in total)
Year progress: By Sunday, 5% of 2026 has passed

Holidays and key dates

There are no US federal holidays, daylight saving time changes or quarter starts in week 3 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 3, 2026

What are the dates of week 3 in 2026?

Week 3 of 2026 starts on Monday, January 12, 2026 and ends on Sunday, January 18, 2026.

What month is week 3 of 2026?

Week 3 falls in January. By the Thursday rule that ISO 8601 uses for years and quarters, it counts as a January week.

How do I get week 3 of 2026 in Excel or Google Sheets?

=ISOWEEKNUM(DATE(2026,1,12)) returns 3. To go the other way, =DATE(2026,1,4)-WEEKDAY(DATE(2026,1,4),2)+1+(3-1)*7 returns the Monday, January 12, 2026.