How can you determine your geographic location based on the time of day?

Having only one piece of information, such as the time of day, wouldn't allow you to determine your geographic position. You would have to have additional information such as the position of the sun (or stars) at a particular time of day in order to accurately determine your position. There is an excellent PBS piece on this at: http://www.pbs.org/wgbh/nova/teachers/ideas/sammons/packet.html