[Issue 12828] Fix SimpleTimeZone.utcOffset so that it has the correct return type

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12828

--- Comment #2 from Jonathan M Davis <jmdavisProg at gmx.com> ---
https://github.com/D-Programming-Language/phobos/pull/2219

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