When and gow often should I give my baby a bath?

Nowshin
This might sound stupid, but I am really confused being a FTM. What time shoulf I give my baby a bath? During the evening when its warm outside, or at night before be. How often should I do it?. My mom always gave us a bath at around 2 pm cause its warm and we wont catch a cold, but all my friends gives bath to their kids at night so that they are clean and sleep well.