Calendar Week Range Calculator
Find the Monday-to-Sunday date range for the ISO week containing any selected date.
How to Use the Calendar Week Range Calculator
This calculator finds the Monday and Sunday that define the week containing any selected date. It is useful for weekly reporting, timesheets, study planning, project reviews and schedules that follow an ISO-style Monday-to-Sunday week.
Example
If you choose a Wednesday, the tool moves backward to that week’s Monday and forward to the following Sunday, giving you the full seven-day range even when it crosses a month or year boundary.
Factors That Affect the Result
The calculator always treats Monday as the first day of the week and Sunday as the last. This may differ from calendars that use Sunday as the first day, so check which convention your schedule or reporting system follows.
Frequently Asked Questions
Does the week always start on Monday?
Yes. This tool uses a Monday-to-Sunday week.
Can a week cross into another month?
Yes. The actual Monday and Sunday dates are displayed.
Can a week cross into another year?
Yes. Weeks near New Year may include dates from two calendar years.
Calendar Rules Behind Calendar Week Range Calculator
Date differences depend on calendar boundaries rather than assuming every month or year has the same length. Month lengths, leap years and whether start or end dates are included can affect the result. When a legal, payroll or contractual deadline is involved, apply the counting convention required by that specific rule.
Calculation Details and Edge Cases
Week-range results depend on which weekday is defined as the start of the week. ISO convention uses Monday, while some calendars use Sunday; the chosen convention should remain consistent when comparing week numbers and ranges.