Hi,
same here, we only used facetime and Imessages for long time now. but we started with facebook messages from 2013-2014. but 2014 onwards mostly imessages and facetime. which Imessages doesn't even show date. only time. for facetime call log ,i just screen shot shows month/day but only few since doesn't save call history for long. i also screen shot some when having facetime. we don't have other apps ,
we didn't submit our application yet. but i think it be hard for me to remember date. so prob just indicate year.and just explain. on the first place not aware of all this ***. we talked 24/7.