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 Provides parsers for common time and date formats.
 
-Functions take the source string and an optional postition.
+Functions take the source string and an optional initial postition.
 
-## `rfc_3339`
+### `rfc_3339 ( string [, init] )`
 
-Returns a luatz timetable and the (optional) time zone offset in seconds
+If the string is a valid RFC-3339 timestamp,
+returns a luatz timetable and the (optional) time zone offset in seconds.
+
+Otherwise returns `nil` and an error message