Date tools
Calendar math, made obvious.
Count working days, move a date, measure a date range, or calculate D-Day. Every rule stays visible.
Working days
Count Monday–Friday working days, choose the date boundaries, and exclude your own holidays.
Date arithmeticAdd or subtract
Move any calendar date forward or backward and see the exact result and weekday.
Date differenceDays between
Find the signed calendar-day difference, weeks plus days, and the inclusive date count.
Countdown calculatorD-Day
See D−N before an event, D-Day on the date, and D+N after it.