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DENVER — Colorado lawmakers voted against a proposal Monday that would have ended the practice of changing clocks twice a year.

The House Agriculture Committee voted 8-5 against House bill 1226, which would have made daylight saving time permanent in the state.

Daylight saving time is the practice of setting clocks an hour ahead in late winter and setting them back an hour in the fall. The changes are made on the second Sunday in March and the first Sunday in November.

Every state uses the system, except most of Arizona and Hawaii.

HB17-1226 would have keep Colorado in daylight saving time throughout the year.

Voters would have had to approve the bill in the November 2018 election and it would have only gone into effect when other states wholly or partially in the Mountain time zone also adopt permanent daylight saving time.


One of the most commonly offered rationales for daylight saving time is the presumption that by extending summer daylight later into the evening, Americans would use less energy.

It was the reason Congress used in enacting daylight saving time during World War I and again after the United States joined World War II, according to author David Prerau.

But a 2008 U.S. Department of Energy study reported that daylight saving time reduces annual energy use by about 0.03 percent.

And a study that same year from the University of California Santa Barbara found it might even increase energy consumption.