The term "dawn-to-darks" is used to depict something that lasts throughout the day, from dawn or sunrise to dark or sunset. The antonyms for "dawn-to-darks" would be words that describe a shorter duration of time such as fleeting, momentary, brief, or ephemeral. The opposite of "dawn-to-darks" could also be something that occurs during the night, such as nocturnal or midnight. Other antonyms could be words that denote a specific time, like punctual or scheduled. In general, antonyms for "dawn-to-darks" would indicate a limited or predetermined timeline, rather than an extended period.