ISO week reference

Week 40 1221: October 4–10, 1221

Exact Monday-to-Sunday dates for 1221-W40. Use this week as a calendar reference, open it in the planner, or view it in the full 1221 ISO calendar.

Plan This Week Open 1221 Calendar

Week40

ISO year1221

Weekdays5

QuarterQ4

ISO reference1221-W40

StartsOct122110, Oct 4

Endsth97385710, Oct 10

Length7 days

Exact dates

Dates in week 40

ISO weeks run Monday through Sunday.

MonOct 41221

TueOct 51221

WedOct 61221

ThuOct 71221

FriOct 81221

SatOct 91221

SunOct 101221

Use this week

Turn these dates into a plan

Open a private weekly planner already set to October 4–10, 1221, then add priorities, deadlines, meetings and hourly work blocks.

Open Week 40 Planner

Year calendarAll 52 ISO weeks in 1221 Quarter viewSee Week 40 inside Q4

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