ISO week reference
Week 52 2025: December 22–28, 2025
Exact Monday-to-Sunday dates for 2025-W52. Use this week as a calendar reference, open it in the planner, or view it in the full 2025 ISO calendar.
Week52
ISO year2025
Weekdays5
QuarterQ4
ISO reference2025-W52
Starts
Ends
Length7 days
Exact dates
Dates in week 52
ISO weeks run Monday through Sunday.
MonDec 222025
TueDec 232025
WedDec 242025
ThuDec 252025
FriDec 262025
SatDec 272025
SunDec 282025
Use this week
Open Week 52 Planner
Turn these dates into a plan
Open a private weekly planner already set to December 22–28, 2025, then add priorities, deadlines, meetings and hourly work blocks.