Time Tools

Convert Seconds to Time turns a raw second count into HH:MM:SS, and Convert Time to Seconds does the reverse — the pair you need whenever one system stores durations and another displays them.

Convert Days to Hours and Convert Hours to Days handle the coarse cases that show up in planning. Convert Time to Decimal produces decimal hours, which is the format timesheet and invoicing systems usually want, and is the one most often miscalculated by hand.

Unix Timestamp Converter moves between epoch values and human-readable dates in both directions. It is the standard first step when a log line does not line up with what a user reported.

Check Leap Years settles the question that quietly breaks date arithmetic. Truncate Clock Time rounds a time down to the hour, minute, or second, and Crontab Guru explains cron expressions in plain English before you rely on one.

Time arithmetic is where off-by-one errors hide: a day boundary, a leap year, a timezone offset. Doing the conversion mechanically removes the class of mistake that survives review because the result looks plausible.

These tools are also fast enough to use mid-conversation, which is when the question usually comes up.