The RMail service records times of delivery and opening in both UTC and Local times on the Acknowledgement, Registered Receipt™ and Open Receipt emails. The UTC time is short for the Coordinated Universal Time described here http://www.rmail.com/resources/coordinated-universal-time/.
1. Delivered UTC Time: This is the time RMail determined the email had been successfully delivered at least to the recipient’s mail sever or mailbox, with the time noted using the Universal Coordinated Time standard. This is Greenwich Mean Time (GMT) without the daylight savings adjustments.
2. Delivered Local Time: This is the conversion of Delivered UTC time into the sender’s local time, as RMail determines from sources provided to RPost. This local time of the sender is determined by either the time zone that the sender’s mail transport server reports as local time. For some, this is set by the sender’s IT administrator if they manage the server in-house. For those that use a mail service provider or ISP, this local time would be the time that the email provider or ISP reports as local. Some sending servers will pass along the local time set in the sender’s email program/client, but in this case, what is reported is still *controlled* by sending mail server. For example, Yahoo users’ local time is always GMT, but Gmail uses the local time of the sender’s mail program.
3. Delivered & Opened Local Time: The time zone is determined through the same process as noted above in “Delivered Local” but in this case, is the time the email was opened and viewed in the recipient’s email program.