formatClock

Formats this duration as a colon-separated clock string, such as "01:23:45".

Durations under an hour format as "MM:SS" ("23:45") and longer durations as "HH:MM:SS", with the hour field growing past two digits when needed ("100:00:00"). Values are truncated to whole seconds, negative durations get a leading minus sign, and infinite durations format as "Infinity".