Date facts
Monday, December 29, 2025
December 29, 2025 is day 363 of 365, in ISO week 1. There are 2 days left in 2025 after this date.
Weekday
Monday
Calendar weekday
Day of year
363
of 365
ISO week
1
Week-year 2026
Days remaining
2
In 2025
Weeks start on Monday and use ISO week numbers. Monday is the first week of 2026.