Change date time on Schiller AT2

Manual for AT-2 (I presume that it's similar to AT-3) says that language may only be changed with SWUP program (whatever that means). To change date: ALT - 9 - 2 - 2 - D - D - M - M - Y - Y
To change time: ALT - 9 - 1 - 1 - H - H - M - M - S - S
To reset clock to start counting: ALT - 9 - 9 - 9 - 2 - 1 - 0
NOTE: This is settings for SCHILLER AT-2, I'm not sure that'll work with AT-3.
I hope this was helpful.

Tapeless Digital Answering System with Time/Day 1717 Manual

HI,
To set time on the schiller AT2 do the following.
1. Power ON the machine.
2. Press the following key sequence ALT,9,1,1.
3 Now enter the time using the digit key (HHMMSS)
You will hear the conformation beep indicating that the time is seted.

To set the date on schiller AT2 Do the following.

1. Press the following key sequence ALT ,9,2,2.
2. Enter the date using the digit key (DDMMYY)
You will hear a conformation beep indicating that the date is seted.
ok

To change the date, hit the ALT key followed by 911 then enter the time in this format: HHMMSS.Then hit the Alt key followed by 922 then enter the date in this format DDMMYY.Note that on some units you may have to enter the date in this format MMDDYYtry both ways and keep the one that works. Test with an printout.

To change the Time :
- Firstly, press the following key sequence : ALT, 9, 1, 1
- Then, enter the time (HHMMSS)
- Finally you'll hear the confirmation beep

To change the Date :
- Firstly, press the following key sequence : ALT, 9, 2, 2
- Then, enter the date (DDMMYY)
- Finally, you'll hear the confirmation beep

To change the Time :
- Firstly, press the following key sequence : ALT, 9, 1, 1
- Then, enter the time (HHMMSS)
- Finally you'll hear the confirmation beep

To change the Date :
- Firstly, press the following key sequence : ALT, 9, 2, 2
- Then, enter the date (DDMMYY)
- Finally, you'll hear the confirmation beep

press Alt then 9 - 1 - 1 for the time.

press Alt then 9 - 2 - 2 for the date

i want to configure my Schiller at-2 plus ecg machine from dutch to english and 3channel to 6channel

cant change the year on my date stamp

The manual is available for download here. (It takes a while to show up, as it is a large manual.) Step by step instructions for setting up date, time, and other user settings in Chapter 3.