Toolbox
Date Calculator
Date interval
Enter valid dates
Add / subtract
Age & anniversary
Weekdays count Monday–Friday only (public holidays are not considered); month arithmetic clamps to month end (Jan 31 + 1 month = Feb 28)
Compute the interval between two dates (years/months/days, total days, weekdays), add or subtract days, weeks, months or years — with an optional business-day mode — and turn a birthday into an age plus a countdown.