Hotel Form Calender dates selection shows opposite

Hii, Pl check Hotel Form in Mozilla firefox. If i select 16th Feb for checkin then 17th Feb should come automatically in checkout, but in mozilla it shows opposite that means if i select 16th Feb in checkin then in checkout 15th feb comes automatically. If i see in mobile then the dates shows correctly and also in correctly comes in google chrome, only in mozilla firefox it shows wrong. Pl Help.