今と昔
the present and the past
今の時代に
はるか昔に
the period of time from the distant past until the present
from ancient times
a period that is about ten years before the period under discussion
昔.
この時代に
It has been so time out of mind―from time immemorial.
その時代に
昔は.
昔(は).
something from the past that is compared to something in the present