So I've been looking into alternative dating systems that could be used in the western world in the modern day assuming the AD/BC dating system never gets used. The Seleukid Era calendar (Or Anno Graecorum), which corresponded to year one being in either 311-312, seemed to have been used in Syria up to 15th century by some. There's also of course the Olympiad dating system starting with the first Olympiad in 776, though as far as I know outside of use by ancient historians, it wasn't used.
I assume the Romans would catch on to using the AVC calendar eventually, though I'm more interested in on focusing on other dating systems.
I assume the Romans would catch on to using the AVC calendar eventually, though I'm more interested in on focusing on other dating systems.