under advanced, there's set timezone.
Advanced
1 Restart Application
2 Reboot System
3 Configure Network Settings
4 Set Hostname
5 Set Timezone
6 Shutdown System (halt)
b >> Back
Your choice:
If you're still having issues, then in 8.2.5.1 and newer, there is the 'enter commands' option #11 off the main menu:
AirWave Management Platform 8.2.6 on airwave.lab.com
1 Upload File
2 Download File
3 Delete File
4 Backup
5 Restore
6 Support
7 Upgrade
8 Advanced
9 Security
10 Custom Commands
11 Enter Commands
q >> Quit
Running Enter Commands
Type 'help' for the list of commands.
$ ? date
date - Show current date and time
date MMDDhhmm[[CC]YY]
Set the date and time - the century and year are optional