Subj : Re: TZUTC - reader's preference
To   : Alan Ianson
From : Matthew Asham
Date : Sun Sep 14 2025 01:14:30

Hi Alan!

> What a local time setting should do is affect the display of the time so that
> it's the local viewers time.
AI> No, the TZUTC setting simply tells you to take XX hours on or off the time of the message to get TZUTC time.
> Something doesn't look right to me about the times to me.  I'll have to take
> a look at this more.  It should be saving the time as a UTC time and then
> using TZUTC as an offset calculator but I have a feeling it's doing
> something else.

For context we're talking about a timezone setting a user can change in their personal settings that affects the date/time display of the message.

When the message comes in the system uses TZUTC to calculates the UTC time, records it in the database and then when the user is viewing the message another calculation is done based on their preferred timezone.  

In theory this means they'd see a 'local' date/timezone.  

AI> I suppose it's possible for a mail reader to post the message time in it's local timezone if it takes into account the TZUTC of the message and adjusts for it's local timezone but I don't know of any reader that does that.

I thought readers would use their local time and include the TZUTC kludge in their outbound packet to help remote systems render 'local time', but I understand TZUTC might not be implemented in which case it's unknown what time zone a Date and time actually are.

Matthew

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