maintainer-feedback requested: [Bug 237248] mail/thunderbird: TOC time off by 2 hours when DST is in effect

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Bug 237248: mail/thunderbird: TOC time off by 2 hours when DST is in effect
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237248



--- Description ---
For some time now I've noticed that the displayed message time sometimes
differs between the TOC and message itself. I am able to reproduce using a
thunderbird package from pkg.freebsd.org but does not happen under windows 10.

My theory is that the code is subtracting instead of adding an hour. I tested
this by setting the system time back before DST took effect and the problem
went away.

I took a stab at finding the place where TOC date formatting occurs but
thunderbird is just too big for someone who doesn't work on it.

I'll attach a couple of screen grabs that show the problem.