ISO WEEK
1
2026
December 29 – January 4, 2026
Week 1 of 53
2% through 2026
Days in Week 1
MonDecember 29
TueDecember 30
WedDecember 31
ThuJanuary 1
New Year's Day
🌔 Waxing Gibbous
FriJanuary 2
🌕 Full Moon
SatJanuary 3
🌕 Full Moon
SunJanuary 4
🌕 Full Moon
Federal Holidays This Week
- New Year's Day — Thursday, January 1
Moon Phases This Week
- 🌔 Waxing Gibbous — Thursday, January 1
- 🌕 Full Moon — Friday, January 2
- 🌕 Full Moon — Saturday, January 3
- 🌕 Full Moon — Sunday, January 4
FAQs
When does Week 1 2026 start and end?
Week 1 of 2026 starts on December 29 (Monday) and ends on January 4, 2026 (Sunday).
What month is Week 1 in?
Week 1 of 2026 is primarily in January. It spans two calendar months.
How many weeks are in 2026?
2026 has 53 ISO weeks. 2026 is a long year with 53 weeks.
