Week 49, 2025

1. Mon1Dec
2. Tue2Dec
3. Wed3Dec
4. Thu4Dec
5. Fri5Dec
6. Sat6Dec
7. Sun7Dec

ISO week

2025-W49

Copy as

CW49 (1–7 Dec)

Quarter

Q4 2025

Weeks in 2025

52

US week number

49

Week 49 is also written KW 49 (Kalenderwoche) or CW 49. ISO weeks start on Monday, and week 1 is the week with the year’s first Thursday. US calendars start weeks on Sunday and count the week with 1 January as week 1, so they give Monday 1 Dec to Saturday 6 Dec the same number: week 49.