Time Expression Calculator

Type an expression such as 1d 2h 30m + 45m - 20s and get one normalized duration plus totals in hours, minutes, and seconds.

Time expression

Supported operators are + and −. Duration terms accept d, h, m, s or HH:MM[:SS]. The parser does not use JavaScript eval.

Expression result

—

—HH:MM:SS

—Total hours

—Total minutes

—Total seconds

Ready

How to use this Time Expression Calculator

Type multiple duration terms separated by plus or minus signs. Use d, h, m, and s notation or HH:MM[:SS] for each term.

Type an expression such as 1d 2h 30m + 45m - 20s and get one normalized duration plus totals in hours, minutes, and seconds.

The expression parser intentionally supports only duration addition and subtraction. It does not execute arbitrary code or mathematical expressions.