With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
frxClockSec
Cisco 90i Clock Sec
1.3.6.1.4.1.1570.1.1.4
Synchronized 24 hour clock for the Cisco 90 Series system - Seconds. This clock is used by the channel units and BRITE cards to set the performance monitoring end-of-hour and end-of-day intervals.
Back to CISCO-90-MIB MIB page.
IPHost Network monitor allows you to monitor frxClockSec on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.