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 32m 34s ago
Title Cap various track tags, featuring editable exceptions lists
downloaded 43m 39s ago
Append user-entered text to beginning or ending of selected tag of each selected track
downloaded 45m 20s ago
Renumber playlist tracks to play order
downloaded 49m 1s ago
Renumber order of selected tracks
downloaded 1h 5m 58s ago
Convert selected tracks and export the converted files to a new folder
downloaded 1h 12m 8s ago
Removes leading and trailing space characters from chosen tags in selected tracks