The Time Zone Data Distribution Service (TZDIST) Geolocate Extension

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Last updated 2017-04-17 (latest revision 2016-10-14)
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This document defines an extension to the Time Zone Data Distribution Service (RFC 7808) to allow a client to determine the correct time zone for a geographic point location using a 'geo' URI (RFC 5870). Open Issues o Does the 'geo' URI value have to be percent-encoded? o Should we advertise the supported coordinate reference systems (and if so, how?) or simply mandate crs=wgs84? o Should we discuss territorial and/or international waters? o What, if any, additional security and privacy concerns are introduced by this extension?


Ken Murchison (

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