Currently, "United States Mountain Standard Time" (MST), defined in federal law as coordinated universal time minus 7 hours, is the standard time within Colorado. During the period of daylight saving time (i.e., the second Sunday in March to the first Sunday in November) time is advanced one hour. Federal law allows a state to stay on standard time year round, but does not currently allow a state to adopt daylight saving time year round.
The act makes daylight saving time, defined as coordinated universal time minus 6 hours, the year-round standard time within the state. The change takes effect only if a federal law is enacted to allow states to remain on daylight saving time year round and at least 4 states in the MST zone, in addition to Colorado, enact legislation making daylight saving time the state's standard time throughout the year.
(Note: This summary applies to this bill as enacted.)