Date math
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Pick dates to see the result.
Do date math with the Date Calculator: find days between two dates, or add and subtract days, weeks, months and years.
Pick a mode. Results update live.
Enter two dates to get the exact day count between them, plus a weeks-and-days breakdown and an approximate month count. Switch to business days to exclude weekends, handy for deadlines and SLAs. Order does not matter; the count is absolute.
Start from any date and shift it by days, weeks, months or years in either direction. Month arithmetic clamps to valid dates (adding one month to January 31 lands on the last day of February), and the result shows the weekday.