>>108017399Hail Protbud, it is indeed I. It's good to hear from you o7
The short answer to your first question is that we Orthodox use the Julian calender while the West uses the Gregorian calender:
https://archive.ph/CF1A8The short answer to your second question is that it actually *is* meant to be based on the year of Christ's birth as Year 0, but those who instituted the calender were slightly off on how many years it had been. It's been a while since I first read about the specifics but if I'm not mistaken, we're basically pretty sure that the Theanthropos was born in 4 BC because that would fit the timeline implied by the imperial census mentioned early in the gospel of Luke.
Oh, wouldn't you know it, I was searching for a Testify video where he describes this in more detail and it turns out he literally made a dedicated video on the exact topic of the census just three days ago! I'll watch it now, feel free to do the same and let me know what you think:
https://www.youtube.com/watch?v=W6fLnijaBWQ 