time of day

Short definition from Wiktionary

Noun

1. 1
   The time according to the clock.
2. 2
   A loosely specified period of time, minutes or hours in duration, especially daytime, or point in time.
3. 3
   The greeting appropriate to the time of day.
4. 4
   era: time; day.
5. 5
   The right thing; the ticket; that which is needed.