The period of each day when the sun is shining is daylight. If you work as a lifeguard at the town pool, your job takes place during daylight.
You can use daylight and daytime interchangeably, although daylight also means "daytime light" or "the light of the sun." If you lose electricity in your house for a few days, you might have to stick to reading when there's daylight. Many public parks are only open during daylight hours. If someone scares the living daylights out of you, they terrify you — this colloquial phrase comes from an old sense of the eyes being referred to as daylights.