This function determines the IANA/Olson time zone identifier from latitude and longitude. This is a helper function which is used to assist in converting downloaded data from UTC to local time.
Timezone information is extracted from the included tz_world dataset. The original tz_world data was created by Eric Muller and can be found at (http://efele.net/maps/tz/world/)
The site Latitude
The site Longitude
Returns the IANA/Olson time zone identifier for a given Latitude and Longitude
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