@KevinTheJedi we have managed to change the time as suggested by you. There is one challenge to identify the below time parameter "Last Message" from which table we are showing as this is giving issue to handle
Sharing below Tables changes we have identified, just in case any one needs those in future
Table ost_ticket
duedate
est_duedate
reopened
closed
lastupdate
created
updated
Table _thread_entry
created
updated
Table _thread_event
timestamp
Table _thread_referral
created