Option to change unit time (seconds -> milliseconds)

[Thomasssb1]

When using this, it works really well but I need for my time to be in milliseconds and although I can convert from seconds to milliseconds, it would be alot nicer if I could skip the need for code and add an option for it before generating the json file. If it could be done on command line it would eliminate the need for intermediary code to change from seconds to milliseconds once generated.
Thanks.