Help with Textedit and AppleScript

Hello,

I have a small problem. A subtitle file I have does not sync with the video file. And I think (I have no idea of AppleScript) it would be easy to write a script to change all the seconds of the .srt file (which are in this format: 00:00:00,000 where you find hh:mm:ss,millesimals). Would it be really easy? In that case, could you tell me where can I ask somebody to write it for me?

The idea I have on my mind is the next:
— First you should easily change the 'date format' (i.e. hh:mm:ss instead of hh:mm:ss,millesimals)
— Then you should easily say hoy many seconds/minutes/hours/millesimals you want to push forward/backward
— And finally the script would push forward/backward all the 'dates' of the .srt file.

Sorry about my english, but at this moment I realize I am terrible writing in English, I really understand almost everything but writing is other thing.

Thank you so much in advance
yoblanco

 

@kryten2 thank you for the answer, I didn't know that program. But I would like to see an script doing so.

@robbieduncan That's the idea, the script should autocorrect that things (like you said, 61 seconds and more). Should it be possible to make it in AppleScript? You're probably right and it's easier to do it with perl, but as I don't know any of those languages, I'm looking for an AppleScript script (and a place, maybe out of macrumors, to ask for it).
If I find it easy to do it under AppleScript I will start learning that language (just because this is the first thing I've found that I think could be done under AS).

Thank you both.