With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
clmLicenseFileTimeStamp
clm License File Time Stamp
1.3.6.1.4.1.9.9.369.1.3.2.1.3
Represents the time when the license file contents was last modified.
Back to CISCO-LICENSE-MGR-MIB MIB page.
IPHost Network monitor allows you to monitor clmLicenseFileTimeStamp on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.