ISO WEEK
1
2025
December 30 – January 5, 2025
Week 1 of 52
2% through 2025
Days in Week 1
MonDecember 30
TueDecember 31
WedJanuary 1
New Year's Day
🌑 New Moon
ThuJanuary 2
🌒 Waxing Crescent
FriJanuary 3
🌒 Waxing Crescent
SatJanuary 4
🌒 Waxing Crescent
SunJanuary 5
🌓 First Quarter
Federal Holidays This Week
- New Year's Day — Wednesday, January 1
Moon Phases This Week
- 🌑 New Moon — Wednesday, January 1
- 🌒 Waxing Crescent — Thursday, January 2
- 🌒 Waxing Crescent — Friday, January 3
- 🌒 Waxing Crescent — Saturday, January 4
- 🌓 First Quarter — Sunday, January 5
FAQs
When does Week 1 2025 start and end?
Week 1 of 2025 starts on December 30 (Monday) and ends on January 5, 2025 (Sunday).
What month is Week 1 in?
Week 1 of 2025 is primarily in January. It spans two calendar months.
How many weeks are in 2025?
2025 has 52 ISO weeks. Most years have 52 weeks.
