Updated filter: "date" now supports a "tz" option

To format dates in a timezone other than that of the current store, add the "tz" option.

{{ "now" | date: "%Y-%m-%d %H:%M %z" }}
=> "2019-01-01 09:00 +0900"

{{ "now" | date: "%Y-%m-%d %H:%M %z", tz: "UTC" }}
=> "2019-01-01 00:00 +0000"

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