daytime—the part of the day when there is natural light:
- In the Tokyo area, users’ charges of electricity at nighttime are rated lower compared to that in the daytime.
time of day—
1. the hour shown on a clock:
- Perhaps it was a student who committed suicide at this very time of day, on this very day, in this very building?
2. a particular period during the day:
- Birds are generally most active at this time of day and most inactive in the early afternoon.