【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.

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