天时
the time; the right time; weather conditions; destiny; course of time; heaven's natural order
天使报喜节
Annunciation (Christian festival on 25th March); Lady day
天时地利人和
the time is right, geographical and social conditions are favorable (idiom); a good time to go to war
当天事当天毕
never put off until tomorrow what you can do today (idiom)