I doubt Ramses II would have described himself as living "1250 years Before Christ", after all.
You would have said it was the 30th year in the reign of Pharaoh Ramesses II. Egypt was one of the many ancient cultures that used regnal years for counting.
You can read more about the history of calendars in the AskHistorians FAQ, or listen to this AskHistorians podcast by the handsomest historian to ever answer questions here! :)