December 21–27, 2026
MonTueWedThuFriSatSun
Week 1 contains the first Thursday of the year.ISO guide →Date → week number
December 27, 2026: What week number?
Sunday, December 27, 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 27, 2026 – January 2, 2027
SunMonTueWedThuFriSat
Week 1 contains January 1.US-style guide →ISO weekWeek 52
US-style weekWeek 53
WeekdaySunday
QuarterQ4
Day of year361 / 365
ISO weekday7 / 7
December 2026
Date context
Sunday, December 27, 2026 is day 361 of 2026 and belongs to ISO Week 52.
The entire ISO Week 52 falls within December.
Distance from today
How long until December 27, 2026?
Days82
Full weeks11
Remaining days5
December 27, 2026 is 82 days from today, equal to 11 full weeks and 5 days.