some translation would have you count or calculate the number 666
Revelation 13:18 (ESV) | In Context | Whole Chapter
18 This calls for wisdom: let the one who has understanding calculate the number of the beast, for it is the number of a man, and his number is 666.
which once again brings us to gibbon who says
"Forty-six years after the flight of Mahomet from Mecca, his disciples appeared in arms under the walls of Constantinople"
from chapter 52
now all you need is an
islamic calendar calculator
now all you have to do is plug in 46 which we got from gibbon
and
you will get 666
I think gibbon knew that
another way to calculate this year