(1) The first light of day.
(2) Dawn.
(1) The second son of a police chief, his duties began at cockcrow and included a strict daily fitness regime devised by his disciplinarian father.
(2) She helped him to dance until cockcrow
(3) The hour of cockcrow was still far off
(4) Well, you'll have to show up at cockcrow tomorrow.
(5) Indian boys play with makeshift bats and balls from cockcrow to nightfall.
(6) He farms, gets up at cockcrow for milking and still manages to run the award winning farm B & B with his wife and three sons.
aurora
morning
daybreak
dawn
sunup
dayspring
dawning
first light
break of day
sunrise
Sunset