[%CFEngine_function_prototype()%]
Description: Return the time at which this agent run started in system representation.
In order to provide an immutable environment against which to converge, this value does not change during the execution of an agent.
Example:
cf3
body file_select zero_age
{
mtime => irange(ago(1,0,0,0,0,0),now);
file_result => "mtime";
}