This is a timecode calculator for Compact Disc track durations. CDs have 75 frames per second, and all track markers and indices must be on a frame boundary. For onward duplication and factory quality-control, cue sheets (often called "PQ sheets") must list timecodes and durations in 75fps timecode.
The page before you will allow you to input two index points given in 75fps timecode, and receive the difference between the two given points, again calculated in 75fps timecode. This could be a track duration, for example. The inputs can be given with or without colons between the numerals.
DURATION IS 00:00:00:00