This was originally made by NationalAtlas.gov (US Federal Government, thus public domain) but it had some "trade marked" logos and other things on it that made it impossible to use here on Openclipart.org even though it was public domain. I edited those out and I'm uploading my edited "no logos" version here for anyone who needs a map of timezones!
US Time Zones free icon was designed by j4p4n for icons Png and presented to its users.
j4p4n
2/7/2018