Roosters crow as a way to attract female chickens, and to tell other roosters. “This is my territory, sty out!” And sometimes roosters seem to crow just for the joy of it.
Every morning, right around the time the sun comes up and it starts getting lighter outside, roosters begin crowing .
All that crowing is not really meant to tell anyone the time; once roosters are awake they keep crowing all day.
Other birds wake up at dawn and sing too, and for the same reasons a rooster crows. It’s just that roosters are much noisier when they wake up.–Dick Rogers