To change the date and time on your CPAP, go to the following link, and download the "Z1 Auto Firmware Upgrade" program onto a PC computer.
http://breas.us/cpap-user-guides-and-software/
Next, open the upgrader shortcut on your desktop, plug the Z1 into a power supply, and connect the Z1 to the PC using the USB cable that was included in your Z1 box.
In the upgrader program, there is the option to "Set Date and Time”.