most current entries of particular pattern

I have many files coming from different objects in a text file.

All objects have a file of the each dates....i.e (11july,12 july, ... so on) as convention of (object1_july11,object2_july11,object3_july11,object1_july12,object3_july12.. so on).

Now sometimes the file from object stops coming in text file.

It needs me to get the most current date for each object in another text file so that we can track from which object the file is not coming.

Thanks in advance.

Sorry but your question is little bit confused?
Could you draw or explain in terms of detailed examples?

• nilesh