Date → week number

October 16, 2026: What week number?

Friday, October 16, 2026ISO Week 422026-W42

ISO Week 42 runs from October 12, 2026 to October 18, 2026.

Mon12OctoberTue13OctoberWed14OctoberThu15OctoberFri16OctoberSat17OctoberSun18October
← 10-15-202610-17-2026 →

ISO vs US-style week numbers

The same date can have different week numbers

ISO weeks start on Monday. The simplified US-style system starts on Sunday and counts the week containing January 1 as Week 1.

ISO week2026-W42

October 12–18, 2026

MonTueWedThuFriSatSun
Week 1 contains the first Thursday of the year.ISO guide →
US-style weekWeek 42

October 11–17, 2026

SunMonTueWedThuFriSat
Week 1 contains January 1.US-style guide →
ISO weekWeek 42
US-style weekWeek 42
WeekdayFriday
QuarterQ4
Day of year289 / 365
ISO weekday5 / 7

Date context

Friday, October 16, 2026 is day 289 of 2026 and belongs to ISO Week 42.

The entire ISO Week 42 falls within October.

Distance from today

How long until October 16, 2026?

Days10
Full weeks1
Remaining days3

October 16, 2026 is 10 days from today, equal to 1 full weeks and 3 days.

International observances

Official observances on this date