daylight savings time
Seasonal hour shift
Daylight saving time is the practice of setting clocks forward one hour during warmer months so that evening daylight lasts longer.
Most of North America and Europe observe it, though the specific dates vary.
The phrase is often rendered daylight savings time with an extra *s*, which some consider incorrect but is widespread.
Often abbreviated DST.
Advance clocks one hour
- fall backWithdraw from advance
- biannualTwice per year
- adjustmentAlteration to improve fit
- summer timeWarmest annual interval
winter time · standard time · alarm clock · midnight · manual adjustment
Official enactment of statutes
- governmentAuthority over a state
- standardizationImplementing uniform technical specifications
- federal lawStatute from central government
- state lawRegional government mandate
exemption · Arizona · Hawaii · European Union · debate · abolition · public policy · advocacy
Built-in sleep-wake cycle
- jet lagPost-flight sleep disruption
- fatigueWeariness from prolonged exertion
- adjustment periodTime needed to adapt
- melatoninCircadian rhythm regulator
body clock · grogginess · drowsiness · sleep debt · alertness · waking up · chronobiology · biological rhythm
Increased hours of light
Recoiling metal spiral
- autumnPost-summer cooling period
- MarchYear's third month
- NovemberEleventh month
- equinoxSun crosses celestial midline
solstice · calendar · annual event · harvest · planting season · winter months
Preventing waste or loss
- electricityEnergy from charged particles
- efficiencyProductive without waste
- peak demandMaximum simultaneous consumption level
- wartimePeriod of armed conflict
oil crisis · carbon reduction · utility · power grid · Benjamin Franklin · World War I
spring forward
Advance clocks one hour
- fall backWithdraw from advance
- biannualTwice per year
- adjustmentAlteration to improve fit
summer time · winter time · standard time · alarm clock · midnight · manual adjustment
legislation
Official enactment of statutes
- governmentAuthority over a state
- standardizationImplementing uniform technical specifications
- federal lawStatute from central government
state law · exemption · Arizona · Hawaii · European Union · debate · abolition · public policy · advocacy · referendum
circadian rhythm
Built-in sleep-wake cycle
- jet lagPost-flight sleep disruption
- fatigueWeariness from prolonged exertion
- adjustment periodTime needed to adapt
melatonin · body clock · grogginess · drowsiness · sleep debt · alertness · waking up · chronobiology · biological rhythm · internal clock
longer days
Increased hours of light
dusk · dawn · golden hour · outdoor time · solar time
spring
Recoiling metal spiral
equinox · solstice · calendar · annual event · harvest · planting season · winter months
conservation
Preventing waste or loss
- electricityEnergy from charged particles
- efficiencyProductive without waste
- peak demandMaximum simultaneous consumption level
wartime · oil crisis · carbon reduction · utility · power grid · Benjamin Franklin · World War I