Where does the time used in time stamp of email response in Service Desk Come from

Where does the time used in time stamp of email response in Service Desk Come from

I have one technician who when he replies back to email in a ticket the time stamp is one hour off. I have confirmed that the time is correct on ticket creation, and when I reply back to email the time stamp is correct. Does this time stamp come from the local computer? His clock on his computer is correct, but could it be the time zone or daylight savings settings are throwing the time off? He is in the Eastern Standard time zone, same as I am.

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