Group Time Zone Calculations

The group "Time Zone Calculations" contains functions to calculate time zones, UTC, DST, daylight change dates and other Time Zone parameters from coordinates or from GeoDLL time zone indexes.

Characteristics of the function group

•	List of Time Zones with designation, UTC and time zone index

•	Exact Time Zone calculation from coordinates using a shapefile

•	Fast Time Zone calculation from coordinates using a 0,1 degree grid file

•	Optional inclusion of 3, 12, 24 and 200 mile territorial limits

•	Determination of a time zone index from a coordinate

•	Determination of Time Zone designation from time zone index

•	Calculation of UTC, DST und Daylight Saving start and end dates

"Time Zone calculations" function group

Information about Time Zones and Maritime Zones

List with Time Zones sorted by designations for the following functions

Function settzgridfile() - Initialize and test a gridfile for time zone calculations

Function settzshapefile() - Initialize and test a shapefile for time zone calculations

Function gettzcurrentbynum() - Determ. of current time zone param. from GeoDLL index

Function gettznamebynum() - Determ. of a time zone designation from a GeoDLL index

Function gettznumbycoordexact() - Exact determination of GeoDLL index from a coordinate

Function gettznumbycoordfast() - Fast determination of GeoDLL index from a coordinate

Function gettzparbynum() - Determination of common time zone param. from GeoDLL index