Duration / Time Converter

The tool accepts `ss`, `mm:ss`, and `hh:mm:ss` inputs and normalizes them automatically.

When minute or second fields go over 60, the value is carried into a more readable hours, minutes, and seconds total.

Each duration is broken down into total seconds, minutes, hours, and normalized time output.

When two inputs are used, the combined duration is calculated as an elapsed interval, not as a clock time or time-zone conversion.

A duration measures how long something lasts; 90 minutes can always be read as 1 hour and 30 minutes.

Clock time can depend on date, time zone, daylight saving rules, and calendar context.

The tool converts each input to seconds first, then breaks the total back into hours, minutes, and seconds.

That workflow is useful for adding podcast segments, video lengths, work sessions, or learning modules.

The output is a mathematical duration conversion; it does not interpret calendar dates, labor breaks, billing rules, or shift policy.

Durations used for payroll, invoices, or legal reporting should be checked against the relevant internal rule set.

The content follows technical references such as ISO 8601 duration notation and MDN time value concepts.

The tool processes the input in the browser; sensitive schedules should be simplified before being shared in examples.