Spring Forward Explained: Why We Lose an Hour in March

Every second Sunday in March, most of the United States 'springs forward.' At 2:00 AM local time, clocks jump instantly to 3:00 AM, and the hour between them simply disappears. The result is one 23-hour day and the start of roughly eight months of Daylight Saving Time.

What actually happens at 2:00 AM

The transition is not gradual. At the stroke of 2:00 AM, the displayed time becomes 3:00 AM. The 2:00–2:59 AM hour never occurs that night, which is why scheduling systems and time-tracking software treat it specially. Most digital devices update automatically, but analog clocks and many appliances need a manual nudge.

Why we do it

The logic is simple: by shifting an hour of daylight from the early morning to the evening, people get more usable light after work or school. Proponents historically pointed to energy savings, though modern studies show the effect is small. The bigger, felt benefit is psychological — longer, brighter evenings that make spring and summer feel like they've truly arrived.

Tips for the lost hour

• Start shifting bedtime 15 minutes earlier for a few nights before the change.
• Get morning sunlight the day after — it resets your circadian rhythm fastest.
• Avoid caffeine late in the afternoon during the transition week.
• Don't schedule demanding early meetings on the Monday after spring forward.

The spring forward is the harder of the two transitions because you're losing sleep rather than gaining it.

The good news: the adjustment usually takes only a few days. By the end of the week, your body has caught up, the evenings are noticeably longer, and the countdown to summer has begun in earnest.