[muawiyah]

As has been noted before it's whatever you want it to be. If you want to say "a long time ago", that's OK. Or, you could say 5,000 years after the beginning of the great meltdown ~ a little more obscure but still gets you in the neighborhood.

NONE of the methods is Biblical.

[Fiji Hill]

“BC” and “AD” have been used for two millennia. “BCE” and “CE” are of recent origin and clearly Christophobic. I first encountered “BCE” and “CE” in a book published in Communist East Germany.