ISO week reference
Week 53 2026: December 28, 2026 – January 3, 2027
Exact Monday-to-Sunday dates for 2026-W53. Use this week as a calendar reference, open it in the planner, or view it in the full 2026 ISO calendar.
Week53
ISO year2026
Weekdays5
QuarterQ4
ISO reference2026-W53
Starts
Ends
Length7 days
Exact dates
Dates in week 53
ISO weeks run Monday through Sunday.
MonDec 282026
TueDec 292026
WedDec 302026
ThuDec 312026
FriJan 12027
SatJan 22027
SunJan 32027
Use this week
Open Week 53 Planner
Turn these dates into a plan
Open a private weekly planner already set to December 28, 2026 – January 3, 2027, then add priorities, deadlines, meetings and hourly work blocks.