December 1–7, 2025
MonTueWedThuFriSatSun
Week 1 contains the first Thursday of the year.ISO guide →Date → week number
December 4, 2025: What week number?
Thursday, December 4, 2025ISO Week 492025-W49
ISO Week 49 runs from December 1, 2025 to December 7, 2025.
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.
November 30 – December 6, 2025
SunMonTueWedThuFriSat
Week 1 contains January 1.US-style guide →ISO weekWeek 49
US-style weekWeek 49
WeekdayThursday
QuarterQ4
Day of year338 / 365
ISO weekday4 / 7
December 2025
Date context
Thursday, December 4, 2025 is day 338 of 2025 and belongs to ISO Week 49.
The entire ISO Week 49 falls within December.
Distance from today
How long ago was December 4, 2025?
Days256
Full weeks36
Remaining days4
December 4, 2025 is 256 days before today, equal to 36 full weeks and 4 days.