Week 42 1666: October 18–24, 1666
Week 42 starts on Monday, October 18, 1666 and ends on Sunday, October 24, 1666.
Quick answer
Week 42 of 1666 is the seven-day ISO week from October 18, 1666 to October 24, 1666. ISO weeks always run from Monday to Sunday.
Check the current work week
Need today’s week instead? Open the current work week dashboard for the live ISO week number, Monday-to-Sunday range, business days left and Friday planning date.
Use week 42 in professional planning
This permanent week reference can be used in project plans, payroll notes, weekly reports, production schedules and deadline documents. Share the week number together with the ISO year and exact date range to avoid ambiguity around New Year.
For calculations that span more than one week, use the weeks between dates calculator. For work schedules, compare the same range with the business days calculator or open the project timeline calculator.
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FAQ
What are the dates for week 42 of 1666?
The dates are October 18, 1666 through October 24, 1666.
What day does this week start?
It starts on Monday.
What day does this week end?
It ends on Sunday.
How should I write this week in a report?
Use “ISO week 42 of 1666 (Oct 18–Oct 24, 1666)” so the week-year and date range are both clear.