Type QSH on a command line, press enter.
Type arsdate (lower case) and press enter.
The following screen appears:
$
arsdate
Usage: arsdate [-a|-i|-t] [-d] [-f] [-g] [-h] [-m] [-n] [-s] [-y] (value | number)
Version: 7.1.2.8
The version line is the Ondemand server version.
Press F3 to exit.