The entire state of Oklahoma is in the Central Time Zone (CST), 6 hours behind Universal Time Coordinated (UTC). It is 1 hour behind the Eastern Time Zone (EST), that of New York City, and 2 hours ahead of the Western Time Zone (WST), that of Los Angeles.
The Central Time Zone also includes the majority of Texas and Kansas; the eastern portions of such states as Nebraska and the Dakotas; the entirety of many centrally located states such as Minnesota, Wisconsin, Iowa, Illinois, Missouri, Arkansas, Louisiana, Mississippi and Alabama; and western portions of Florida, Tennessee, Kentucky and Indiana.
In addition, Oklahoma practices Daylight Saving Time, in effect from the 2nd Sunday in March to the 1st Sunday in November. During Daylight Saving Time, Oklahoma is 5 hours behind Universal Time Coordinated (UTC). Daylight Saving Time is not observed in the U.S. by Hawaii, American Samoa, Guam, Puerto Rico, the Virgin Islands, and Arizona (with the exception of the Navajo Nation in northeastern Arizona).