Summer and Normal (Winter) Time - Calculator

A simple calculator, that converts from summer time (daylight saving) to winter time (normal time), or the other way. Please insert the time data into the first row.

In most countries with daylight saving, it is: summer time = winter time + 1 h. In central Europe, summer time is from the last Sunday in March to the last Sunday in October. In March, the clock jumps from 2 to 3 a.m. Sunday morning, in October it jumps from 3 to 2 a.m. on Sunday morning. Winter time is the normal time, even though summer time is for the longer part of the year.

In principle, every place on Earth has a specific time that depends solely on its longitude, i.e., its position east or west. This is what is known as true local time. It would, of course, be virtually impossible and extremely impractical to have to adjust the clock every few kilometers or miles east or west. Therefore, regions of the world, generally divided by country, have been divided into time zones that usually differ by an hour, sometimes only by half an hour. These time zones indicate approximately the correct time there. This is normal time. A shift forward of one hour, as occurs when switching to daylight saving time, would be equivalent to moving the country several hundred or thousand kilometers east. Daylight saving time is therefore simply the wrong time zone for that location and does not indicate the true time.
Daylight saving time was originally introduced to save energy, as it was thought that people are more active in the evening and the daylight makes more sense then than in the morning. However, it has been shown that the change does not save any energy, and that the forced earlier wake-up actually has detrimental health consequences. Therefore, it would be desirable to abandon daylight saving time and return to year-round, correct normal time.