The map outlines were completely hand traced from :
https://www.cia.gov/library/publications/the-world-factbook/reference_maps/time_zones.html(public domain map at public source)
Traced in: Illustrator CS3, 1 layer
File created 05/12/2007
Information about this public domain ressource can be seen here :
The Factbook is in the public domain. Accordingly, it may be copied freely without permission of the Central Intelligence Agency (CIA).