5 essential facts about daylight saving time (also known as summer and winter time).
Remember clock changes with this simple mnemonic
Unsure whether clocks move forward or back? In spring, clocks spring forward—a reliable way to recall the shift.
Daylight saving time aims to save energy
It was introduced to cut energy use by an estimated 0.3%, though recent studies question this benefit. In the Netherlands, it was first implemented in 1977, following an earlier period from 1916 to 1945.
Summer time means later morning light
Sticking to summer time year-round would delay dawn until around 9:00 AM on New Year's Day in winter months.
Summer time or winter time: Which is healthier?
Experts are divided. Some advocate permanent winter time as the natural solar alignment, avoiding prolonged dark mornings that hinder our wake-up routines. Others favor permanent summer time, citing health benefits from extended evening daylight that encourages more outdoor activity.
Stick to your normal bedtime during transitions
The one-hour shift affects people differently—some barely notice, while others feel the sleep loss acutely. Maintaining your routine helps minimize disruption.
