The time of daylight; the time between sunrise and sunset.
"The birds were most active during the daytime, singing loudly as the sun climbed higher in the sky."
In plain English: Daytime is the period when it is light outside and people are awake, usually from sunrise until sunset.
"The daytime heat made walking outside uncomfortable without sunscreen."
Usage: Use this noun specifically when referring to the period between sunrise and sunset, rather than using it as an adjective where "during the day" is more natural. Avoid confusing it with "daylight," which emphasizes brightness over the specific time interval.
Pertaining to daytime; appropriate to the day.
"The store offers special discounts during daytime hours when fewer customers are visiting."
In plain English: Daytime describes any time when it is bright outside and you can see clearly without needing artificial light.
"The children played all daytime in the park while their parents worked inside."
The word daytime is a straightforward combination of the words day and time. It was formed to describe the period when daylight is present.