all in a day’s work
any day now
(as) clear/plain as day
back in the day
a/the big day
someone’s day
day after day
the day after tomorrow
day and night/night and day
the day before yesterday
day by day
day in, day out
someone’s day in the sun
someone’s day will come
from day one
from day to day
from one day to the next
the good old days
have your day in court
have had your/its day
have seen better days
if someone’s a day
in the old days
in this day and age
in those days
it’s not someone’s day
it’s not every day that
(just) another day at the office
someone’s lucky day
make someone’s day
make a day of it
make my day
not have all day
of someone’s/something’s day
of the day
one day
one of these days
one of those days
the other day
some day
that’ll be the day
these days
those were the days
to the day
to this day
win/carry the day