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Time and date is system wide programming and not the phone. You need to read the Administration Guide that matches the phone system model you have. You also need to do it from the Administration phone, usually the 2 lowest ext #'s on the system. NEC DTR16D Phones work on several NEC systems. If it is an Elite or IPK then search internet for: NEC ipk attendant guide
First and foremost we need to know what system you have. Then we can proceed with how to program the button.
NEC Elite 48, 192, IPK 1
First pick the button you want to program. Lets say button 13 in this example. Next check to see if that button is programmed by pressing Feature and that key. If that key says Vacant then it is available for use.
Next you will need to hit "Feature and 4" on that station to find the port #. Port # is Tel 10 for example. That means port 10 is where your extension resides.
Now type in "Feature, #, 0 *, 8974". The phone should say Program Mode. Now look at the Line Keys. These are the keys right above the # pad. Count from left to right 4 keys. Hit Line Key 4 and then type 12 on the dial pad.
Now that we are in key programming we need to enter the port of your phone. Make sure the blinking cursor is on the far left. If not press * to move to the left. Now enter 10 (port 10 or Tel 10) on the dial pad. The cursor should be right near the L. If not then press # to move to that position on the right. Remember * will bring you back to the left and # to the right.
This is where you are to enter the key #. In our example it is key 13. Dial 13 on the dial pad. Next we are going to change the key to a headset key by pressing "Recall, Line key 3". It should say H Set on the right. Now that you have the proper key set you need to hit transfer to write the programming. Remember to try and find a key that is not programmed, this will ensure that you don't undo any programming that is already in place.
Any other system other than the NEC 48, 192 or IPK 1 will not work.