EST: https://www.timeanddate.com/worldclock/fullscreen.html?n=417

UTC: https://www.timeanddate.com/worldclock/fullscreen.html?n=1440

Chicago: https://www.timeanddate.com/worldclock/fullscreen.html?n=64

Denver: https://www.timeanddate.com/worldclock/fullscreen.html?n=75

California: https://www.timeanddate.com/worldclock/fullscreen.html?n=217

Hawaii: https://www.timeanddate.com/worldclock/fullscreen.html?n=103