Half an hour past 12(am) midnight, or more formal and exact would be 00:30; The practice of adding “dark” and “thirty” (30) can be used sometimes as a slang term in place of an otherwise specific time a time of night, meaning some time when it is dark out between 00:01 - 05:00 hours local time.
A shift (scheduled work period) that takes place early in the day.
At a time before expected; sooner than usual.
Soon; in good time; seasonably.
Near the start or beginning.
Near the start of the day.
Having begun to occur; in its early stages.
At a time in advance of the usual or expected event.
Arriving a time before expected; sooner than on time.
Of a star or class of stars, hotter than the sun.