Take an input list of phone numbers, strip out the first three digits (remove 1, 011, +011, +01, +1) and use that as the area code. Output the time zone of the area code. Include all +1 style area codes, which include Caribbean, Canada, the United States, and some small islands around the world.
This should be a fairly simple program.
Read from input file in CSV format.
Output in output file in CSV format.