ISO week reference
Week 52 2026: December 21–27, 2026
Exact Monday-to-Sunday dates for 2026-W52. Use this week as a calendar reference, open it in the planner, or view it in the full 2026 ISO calendar.
Week52
ISO year2026
Weekdays5
QuarterQ4
ISO reference2026-W52
Starts
Ends
Length7 days
Exact dates
Dates in week 52
ISO weeks run Monday through Sunday.
MonDec 212026
TueDec 222026
WedDec 232026
ThuDec 242026
FriDec 252026
SatDec 262026
SunDec 272026
Use this week
Open Week 52 Planner
Turn these dates into a plan
Open a private weekly planner already set to December 21–27, 2026, then add priorities, deadlines, meetings and hourly work blocks.