Seconds to sane units, sprint arithmetic, ISO 8601 and epoch output — the time math you keep re-deriving in a REPL.
Every developer has typed 86400 into a calculator to remember what a day is. TCalc knows: durations parse from any unit and format to any other — seconds, minutes, hours, days, timecode, ISO 8601, Unix epoch.
The developer layout below ships with the units you actually use; deadline math like "sprint minus time burned" is a single expression.
Sprint remaining after three days and change of work.
That timeout value, in human units.
A million seconds, converted with one keypress.
Days to minutes — or seconds, or milliseconds.
Type the value with its unit: 10000s displays as 2h 46m 40s in compact format, or as 2.7778h in decimal hours. No dividing by 3600 in your head.
Yes — datetime results can be formatted as ISO 8601 or Unix epoch, and durations down to milliseconds. Switching formats is instant.
Yes: subtract dates to get the gap (2026-12-24 − 2026-07-17 = 159 days) or subtract burned time from a sprint: 14d − 3d 4h = 10D 20h.