Support for FW policy install time on Check Point

Hello,

Check Point provides the install time for firewall policy through their MIB, but it's a STRING instead of timeticks for example, so I won't get parsed properly as the code is today.

// CHECKPOINT-MIB::fwInstallTime.0 = STRING: Sun Feb  8 02:18:45 2026 

It would be nice to have this value as an 'age' sensor

$config['mibs'][$mib]['sensor'][] = [

    'class'               => 'age',

    'oid'                 => 'fwInstallTime',

    'oid_num'             => '.1.3.6.1.4.1.2620.1.1.25.2',

    'descr'               => 'Policy install time',

    'unit'                => 'timeticks',

    'convert'             => 'sysuptime', // sensor_convert sysUpTime - value

    'min'                 => -1,

]; 

I guess a function like strtotime could convert this into the proper format, but I am unable to locate exactly where to add this to the sensor code.
Maybe if unit = string = try convert using strtotime

Thanks!