[hobbes78]

I see this will only shift the timings some offset. But many times it isn't enough e.g. if the video source is NTSC and the subtitle were meant for PAL.

In this scenario I use Subtitle Workshop, which allows me to specify two (or more) pairs of times, and all subtitles are synchronized accordingly.

Optimally the two pairs of times would be near the beginning and the end, but to prevent big plot spoilers, I usually use the beginning and 2/3 of the length.