Panasonic how to change ringing modes

Night Mode/Day Mode
How do I change ringing mode?

KX-TDA 50/100/200/600 Press Time Service Button to change. If Time Service light is off, you are in DAY MODE, Red = NIGHT MODE, Green = LUNCH MODE, Flashing Green = BREAK MODE, Flashing red = HOLIDAY MODE
KX-TD 308 Press DAY key or NIGHT Key to change ringing mode. If no key available press INTERCOM 780 for DAY or INTERCOM 781 for NIGHT.
KX-TD 308/186/1232 Press DAY key or NIGHT Key to change ringing mode. If no key available press INTERCOM 780 for DAY or INTERCOM 781 for NIGHT.
KX-TA1232 Press DAY key or NIGHT Key to change ringing mode. If no key available press INTERCOM 780 for DAY or INTERCOM 781 for NIGHT.
KX-TA 624 KX-TA 824 Press DAY key, LUNCH key or NIGHT Key to change ringing mode. If no key available press INTERCOM 781# for DAY or INTERCOM 782# for NIGHT or INTERCOM 783# for LUNCH.
KX-TD 500 Press DAY/NIGHT Key at main phone. No code available for the TD 500. Program a DAY/NIGHT Key by pressing PROGRAM 99, Press the key you desire to use, Press 73, press STORE, Lift Handset and hang up.
KX-T 308/616/1232 Press DAY key or NIGHT Key to change ringing mode. If no key available press INTERCOM 781# for DAY or INTERCOM 782# for NIGHT.

How can I determine if the system is in Day or Night Mode?

From any display phone, with the handset down and the speakerphone off, press the # key. The display will say Day or Night Mode or Lunch Mode.
On the KX-TDA systems, press TRANSFER