The transition from ST to DST has the effect of moving one hour of daylight from the morning to the evening. We advance our clocks ahead one hour at the beginning of DST, and move them back one hour ('spring forward, fall back') when we return to standard time (ST). In the United States, this has the effect of creating more sunlit hours in the evening during months when the weather is the warmest. and that hour is repeated, so there is an extra hour in the day)ĭaylight saving time, or DST, is the period of the year when clocks are moved one hour ahead. on the first Sunday of November (at 2 a.m. the local time time skips ahead to 3 a.m. At present, daylight saving time in the United States

DST is now in effect for 238 days, or about 65% of the year, although Congress retained the right to revert to the prior law should the change prove unpopular or if energy savings are not significant. The rules increased the duration of DST by about one month. The new changes were enacted by the Energy Policy Act of 2005, which extended the length of DST in the interest of reducing energy consumption. The rules for DST changed in 2007 for the first time in more than 20 years. What are the current rules for daylight saving time? Two-Way Satellite Time and Frequency Transfer (TWSTFT)ĭuring 2022, daylight saving time is in effect from March 13 at 2 a.m.

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