Timecode Calculator is a utility to add, subtract, multiply, and divide timecodes. It may also be used to accurately convert timecodes to different frame rates. Timecode Calculator accepts frame count or timecode as input.
Built in cut/copy/paste functionality using buttons or keyboard shortcuts. First select "Timecode" or "Frames," then press the button to cut, copy, or paste. Keyboard shortcuts may also be used (Ctrl+X/C/V).
It also remembers your last used settings for input type and frame rate.