For HP Comware (version 5.2), this facility is also possible with the command "schedule". Below are two options for the command.
!# Reboot system at exact time
schedule reboot at <hh:mm>
!# Reboot system after time interval
schedule reboot delay [<mm> or <hh:mm>]
To display status of scheduled reboot
display schedule reboot
undo schedule reboot
Below is sample session on the test switch where I scheduled a reboot in 10 minutes but later cancelled it.
<HP_TEST-SW-5120>schedule reboot delay 10
Reboot system at 08:21 01/24/2015(in 0 hour(s) and 10 minute(s)). confirm? [Y/N]:Y
<HP_TEST-SW-5120>display schedule reboot
System will reboot at 08:21 01/24/2015 (in 0 hours and 9 minutes).
<HP_TEST-SW-5120>undo schedule reboot
<HP_TEST-SW-5120>display schedule reboot
<HP_TEST-SW-5120>