For macOS 10.10 and later only. This script will reset the Start and (optionally) the Stop Time of the selected tracks--or all the tracks of the selected playlist--to "0:00" and (optionally) their entire duration, respectively.
You might also be interested in Batch Trim Start or Stop Time (Seconds).
Choose to reset the tracks Start Time to 0:00 and, optionally, the Stop Time to the full duration of the track
Perhaps Also of Interest...
downloaded 11m 0s ago
Locates pairs of track entries pointing to the same file
downloaded 50m 23s ago
Perform search-and-replace on text in your choice of tags
downloaded 55m 37s ago
Display, create text file listing info of dead tracks
downloaded 1h 4m 3s ago
Convert selected tracks and export the converted files to a new folder
downloaded 1h 11m 36s ago
Prefix each selected track's Song Name with the number of its order in the selection.
downloaded 1h 11m 51s ago
Batch-change the Album Rating for the albums of selected tracks