December 21–27, 2026
MonTueWedThuFriSatSun
Week 1 contains the first Thursday of the year.ISO guide →Date → week number
December 23, 2026: What week number?
Wednesday, December 23, 2026ISO Week 522026-W52
ISO Week 52 runs from December 21, 2026 to December 27, 2026.
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.
December 20–26, 2026
SunMonTueWedThuFriSat
Week 1 contains January 1.US-style guide →ISO weekWeek 52
US-style weekWeek 52
WeekdayWednesday
QuarterQ4
Day of year357 / 365
ISO weekday3 / 7
December 2026
Date context
Wednesday, December 23, 2026 is day 357 of 2026 and belongs to ISO Week 52.
The entire ISO Week 52 falls within December.
Distance from today
How long until December 23, 2026?
Days128
Full weeks18
Remaining days2
December 23, 2026 is 128 days from today, equal to 18 full weeks and 2 days.