daytime一般用于过去完成时/
过去完成进行时、现在进行时、现在完成时等
貝体看具体语境。
例句：We can't see the moon during the daytime.
on daytime用于过去式 /一般现在时 ，例如：In the present study we investigated the effects of school starting time on daytime behavior and sleep.
during the daytime一般用于过去完成时/ 过去完成进行时、现在进行时、现在完成时等
例句：
You don't often see this bird in daytime.这种鸟白天不常见
daytime用于一般现在时，中文意思是白天，日间。例句:Baby sleeps even in the daytime.婴儿连白天也睡觉。