The system clock can be adjusted by choosing Configuration > Features > Device Administration > Administration > Clock, as shown in Figure 18-15. Select the appropriate time zone from the drop-down menu and adjust the system date by browsing through the monthly calendar. The system time can be adjusted by entering the time in the 24-hour format. In Figure 18-15, the system time is being adjusted to 5:05:05 a.m. on August 5, 2005 in the Eastern time zone. Click Apply to adjust the system clock.
Figure 18-15. Adjusting the System Clock
Example 18-6 displays the CLI commands to adjust the system clock that ASDM sends to the security Cisco ASA.
Example 18-6. Adjusting the System Clock via the CLI
clock timezone EST -5 0 clock summer-time EDT recurring 1 Sun Apr 2:00 last Sun Oct 2:00 60 clock set 5:5:5 AUG 5 2005
The system clock can be dynamically adjusted if an NTP server is specified on Cisco ASA. Set up an NTP server by choosing Configuration > Features > Device Administration > Administration > NTP. Click Add to enter a new NTP server and specify the IP address and the source interface information, as shown in Figure 18-16. If NTP authentication is being used, specify the authentication key and the key value. In this figure, a preferred NTP server located at 192.168.10.50 toward the inside interface is defined with an authentication key number of 1 and a key value of csco.
Figure 18-16. Specifying an NTP Server
Example 18-7 shows the CLI commands that ASDM sends to the security Cisco ASA.
Example 18-7. Specifying an NTP Server via the CLI
ntp server 192.168.10.50 key 1 source inside prefer ntp authenticate ntp authentication-key 1 md5 csco