How to find ticket created time?
Ticket detail view gives you information about time span of ticket, To see details go to ticket detail view page in top left tab you can see the below information:
Ticket source : It's shows ticket source icon from where ticket has been created
Ticket Id : Ticket Id is unique id for each ticket
Created on : This is the date when ticket is created
Due date : Due date is date and time as per define SLA, ticket needs to be resolved by this time.
Additional Info: Any custom form field value given by customer while submitting ticket ( Additional info display only when you have tagged any Custom form with particular helptopic).