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Science Series: Daylight Saving Time

History of Daylight Saving Time

Why do we Spring forward?

4 min readMar 7, 2025

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Saving Daylight Mobilize an Extra Hour of Daylight. Image: Wikimedia

It seems like only yesterday that we discussed the ending of Daylight Saving Time, or DST, a brilliant campaign to convince people that we’re getting more daylight each day when, in reality, they’ve simply changed their clocks and then forgotten about it within two weeks. It was only back in November, four months ago.

Changes in Daylight Saving Time

Indeed, the rules for DST that began in 2007 meant an extra four or five weeks of DST each year. There are now 238 days of DST, compared to a total of 210 days of DST back in 2006 under the previous rules. This means the U. S. remains on DST for about 65% of the year. So, if you think about it, DST will be in effect for most of the year; Standard time is no longer the standard. It might be more significant to recognize Daylight Losing Time.

Worldwide DST

Daylight saving time regions. Image: Wikipedia

It has also spread to other countries, but cloaked under different names. In the European Union (EU), it is called the Summer Time and happens from the last Sunday in…

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Bill Petro
Bill Petro

Written by Bill Petro

Historian, technologist, blogger/podcaster. Former Silicon Valley tech exec. Author of articles on history, tech, pop culture, & travel. https://billpetro.com

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