Question: what is the format in which ti stores time?

[xfim]

I am asking because sometimes I need to edit by hand the file because I have forgotten to start or stop 'ti'. But it turns out that the time stored in the file is one hour before my current time. Therefore, I would like first to ask what is the format in which ti stores the data, and second whether it can be done so in a way that uses the date the user is "living", to avoid having to make translations when editing the file by hand.

Thank you.