Time shifting This gem lets shift time in SubRip files when it has a mistake, and you need to shift everything a few seconds back or ahead. It creates a command line utility to help us to create a new subrip file that is shifted a given amount of milliseconds. So, for example, if I want to shift everything 2500ms ahead, I would start with this: 01:32:04,283 --> 01:32:07,769 and end up with: 01:32:06,783 --> 01:32:10,269