ICC New datetime field - Custom API

The bank is trying to leverage the ICC SLC process to track whether a file has met its SLC.
We are having applications (ie. SFG components and other custom applications) raising MQ events with time stamp to start and end SLC of a file.
We then wrote our custom java application to pick up these MQ events and call the ICC api to register the start and end of SLC.
This is to ensure that all SLC will be tracked even in the scenario that ICC application goes down.
When the ICC application does come up, we will like to still have the custom application we created to register the SLC of the file.

But for this particular scenario, when ICC application comes up and our application then try to start registering the SLC of the file, we found out that ICC is only registering the start/stop of SLC based on the time ICC receive the request via api. If ICC application goes down yesterday and come up today, and if the file was received yesterday and we are trying to register the SLC of the file, then the retried call to register the ICC will register the timestamp as today and not yesterday.
Due to this issue, we are not able to truly use ICC to register the SLC of a file.

The bank will like to have ICC api to create a new field in the api for timestamp, and have the ICC api to use this timestamp field to register the start/stop time of the SLC call.

Is this something which you can figure out and advise? We can raise a FPR in case you require one. Let us know if you need any further information regarding the requirement.