I am using the JSSR / JYTHON replacement for expire ( Jython Drop-in Replacement for Expire 1.x Binding ). This is based on helper libraries ( Helper Libraries for openHAB Scripted Automation — openHAB Helper Libraries documentation )
While I am using a rule to only display changes to also display the last time of the change it should be possible to implement it in the other way around to check for missing changes.