Date → week number

September 3, 2005: What week number?

Saturday, September 3, 2005ISO Week 352005-W35

ISO Week 35 runs from August 29, 2005 to September 4, 2005.

Mon29AugustTue30AugustWed31AugustThu1SeptemberFri2SeptemberSat3SeptemberSun4September
← 09-02-200509-04-2005 →

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 week2005-W35

August 29 – September 4, 2005

MonTueWedThuFriSatSun
Week 1 contains the first Thursday of the year.ISO guide →
US-style weekWeek 36

August 28 – September 3, 2005

SunMonTueWedThuFriSat
Week 1 contains January 1.US-style guide →
ISO weekWeek 35
US-style weekWeek 36
WeekdaySaturday
QuarterQ3
Day of year246 / 365
ISO weekday6 / 7

Date context

Saturday, September 3, 2005 is day 246 of 2005 and belongs to ISO Week 35.

This ISO week crosses a month boundary: it starts in August and ends in September.

Distance from today

How long ago was September 3, 2005?

Days7653
Full weeks1093
Remaining days2

September 3, 2005 is 7653 days before today, equal to 1093 full weeks and 2 days.