You realize that the time on the SSIM appliance is incorrect and not in sync with the ntp-server that was configured in the webUI.

1. login to the SSIM with a SSH client or the console
2. become "root" via:  su -
3. run the following commands:
   # service ntpd stop
   # ntpdate -u ntp_server_ip
   (replace ntp_server_ip with your actual NTP-Server IP or name)
   # service ntpd start

If you want to check the current ntp settings, you can use ntpq command:
# ntpq -p

It lists all configured ntp-servers and highlights the current one in use.