ISO week reference
Week 42 2026: October 12–18, 2026
Exact Monday-to-Sunday dates for 2026-W42. Use this week as a calendar reference, open it in the planner, or view it in the full 2026 ISO calendar.
Week42
ISO year2026
Weekdays5
QuarterQ4
ISO reference2026-W42
Starts
Ends
Length7 days
Exact dates
Dates in week 42
ISO weeks run Monday through Sunday.
MonOct 122026
TueOct 132026
WedOct 142026
ThuOct 152026
FriOct 162026
SatOct 172026
SunOct 182026
Use this week
Open Week 42 Planner
Turn these dates into a plan
Open a private weekly planner already set to October 12–18, 2026, then add priorities, deadlines, meetings and hourly work blocks.