RSS-Bridge currently statically sets the timezone to UTC which can
result in incorrect timestamps if the server is hosted in another
region.
This commit adds a new configuration parameter to allow admins to
specify their own timezone for their servers. Invalid values will
result in an error message.
Example:
[system]
timezone = "UTC"
For compatibility reasons the default value is set to UTC.
This parameter accepts any of the supported timezones listed at
https://www.php.net/manual/en/timezones.phpCloses#956
References #1001
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