Panasonic DBS 824 Manual page 258

Automatic Day Mode Start Time
If both Auto Day and Auto Night modes are turned on the attendant NIGHT
key cannot be used
When one Auto mode is turned on the mode cannot be reset by the NIGHT
key until 3 minutes after the Auto mode is activated (When both Auto modes
are set, the NIGHT key cannot be used )
Required Intervals Between Auto Day and Night Modes If both Auto
modes are set, the manufacturer recommends that the starting times of the
modes differ by at least one hour
l-110 DBS 824-10-400 Issued 3/l/95