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The FormsAuthenticationTicket.IssueDate property represents the local date and time when the forms-authentication ticket was issued. The FormsAuthentication.RenewTicketIfOld(FormsAuthenticationTicket) method uses the FormsAuthenticationTicket.IssueDate property value to determine whether the FormsAuthenticationTicket.Expiration date and time of a forms-authentication ticket needs to be renewed and also uses the FormsAuthenticationTicket.IssueDate property value to determine the new FormsAuthenticationTicket.Expiration date and time. When a ticket is renewed, the FormsAuthenticationTicket.IssueDate property is updated to the local date and time.