why do creckets chirp during the night and not during the day?

Answer 1

Crickets are active day and night, and chirp by rubbing the wings against the side of the body. Crickets are mature when they are 6 weeks old and at this time, grow wings, mate and then die. The faster a cricket chirps, the higher the temperature is.

Answer 2

Crickets do chirp during the day, you're just making too much noise to notice them. Go somewhere quiet, turn off everything that makes noise, and listen for a while.