September 28 – October 4, 2026
MonTueWedThuFriSatSun
Week 1 contains the first Thursday of the year.ISO guide →Date → week number
October 3, 2026: What week number?
Saturday, October 3, 2026ISO Week 402026-W40
ISO Week 40 runs from September 28, 2026 to October 4, 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.
September 27 – October 3, 2026
SunMonTueWedThuFriSat
Week 1 contains January 1.US-style guide →ISO weekWeek 40
US-style weekWeek 40
WeekdaySaturday
QuarterQ4
Day of year276 / 365
ISO weekday6 / 7
October 2026
Date context
Saturday, October 3, 2026 is day 276 of 2026 and belongs to ISO Week 40.
This ISO week crosses a month boundary: it starts in September and ends in October.
Distance from today
How long until October 3, 2026?
Days47
Full weeks6
Remaining days5
October 3, 2026 is 47 days from today, equal to 6 full weeks and 5 days.