in systematic programming,

Write a C or C++ program that takes a subtitle fle(a file with .srt extension) and a signed number (in milliseconds) as its inputs and add/subtract that amount of time from all of the content of the file and store the modified file. For example, consider the following small part of a subtitle from the big bang theory:

The first text will appear at 00:00:03,258 till 00:00:05,078. it is very annoying if it is not synced with the movie. Your code moves all of the time forward or backward according to the number of milliseconds that the user specified.