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I have an Outlook 365 desktop client on Windows 10 which for every email sent has the date one hour ahead.
It would appear this is a daylight savings issue however the clock on the computer is correct, mails sent via the Gmail web interface come through fine so it's something to do with the Outlook client.
I've checked the timezone in the Outlook calendar settings and that's correct, however there's no checkbox for obeying DST changes which a search of the internet suggests will resolve it.
An example Date header
Date: Thu, 3 May 2018 12:42:38 +0100
This was actually sent at Thu, 3 May 2018 11:42:38 +0100
Rwky
Posted 2018-05-03T11:11:23.603
Reputation: 648
Check the value in Settings -> Options -> Settings -> Regional -> Current time zone. Is that client in the same time-zone as you? Do others in the same time zone as the client also see a wrong hour? – harrymc – 2018-05-08T06:39:55.060
Yes the current time zone is correct if an email is sent from outlook to someone in the same time zone it appears as the correct time zone but one hour ahead. – Rwky – 2018-05-09T11:09:47.930
The simplest explanation is that for that one client the time zone setting in his Microsoft personal info account is wrong. – harrymc – 2018-05-09T18:08:37.120