--- title: When Is Daylight Savings Time 2015? description: It's time to spring forward—here's what you need to know about Daylight Savings Time canonical: https://time.com/3734218/daylight-saving-time-spring-forward/ author: Eliana Dockterman article:opinion: false article:content_tier: free article:published_time: 2015-03-06T17:20:12.000Z article:modified_time: 2026-10-01T09:03:25.265Z og:title: What You Need to Know About Daylight Saving Time og:description: It's time to spring forward—unless you live in Arizona or Hawaii og:url: https://time.com/3734218/daylight-saving-time-spring-forward/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/blt0e3b903cbcdcf0c8/698782a9cd1bbaa2c36f5951/clock.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 og:image:width: 2560 og:image:height: 1440 og:image:alt: Alarm clock daylight savings og:type: article twitter:card: summary_large_image twitter:title: What You Need to Know About Daylight Saving Time twitter:description: It's time to spring forward—unless you live in Arizona or Hawaii twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/blt0e3b903cbcdcf0c8/698782a9cd1bbaa2c36f5951/clock.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 ---  # What to Know About Daylight Saving Time > Sponsored content. 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Every edition is assembled by TIME editors rather than generated automatically. ### Sources * TIME Newsletters: [time.com/newsletters](/c/time-nl-brief-2026q3/newsletters?i=c3b929ce-3f4a-41b8-a714-062d5f1c90e1&cr=time-nl-brief-2026q3-v1) ## Video: Time Explains: Daylight Saving Time [Watch (HLS stream): Time Explains: Daylight Saving Time](https://cdn.jwplayer.com/manifests/gMvVuTDE.m3u8) (2:26)  _Published 2013-10-30. A recent study shows that daylight saving actually accomplishes the opposite of its intended goal: saving energy._  by [Eliana Dockterman](https://time.com/author/eliana-dockterman/)  ## Eliana Dockterman Correspondent Mar 6, 2015 5:20 PM UTC  by [Eliana Dockterman](https://time.com/author/eliana-dockterman/)  ## Eliana Dockterman Correspondent Mar 6, 2015 5:20 PM UTC It’s time to spring forward. On Sunday at 2 a.m., the clock will move forward an hour. Yes, that means [you’ll lose one hour of sleep](http://time.com/3731924/daylight-saving-time/), but it also means you will also get one extra hour of springtime sunshine. At least, that’s true for most Americans. Those who live in Arizona and Hawaii will get a better night’s rest because both of those states have opted out of Daylight Saving Time. If you’re wondering why (most of) America goes through this routine every year, look to Germany. The country implemented an official Daylight Saving Time during World War I to save money on lighting and divert it to the war. Thirty-one other countries followed suit. The history of the practice is, and remains, [complicated](http://time.com/3717487/daylight-saving-time-1923/): It had informally existed in Ancient Egypt and had even been suggested by Ben Franklin. In the U.S., Daylight Saving Time was [repealed](http://time.com/3695333/daylight-saving-time-wwii/) after the war but then brought back by politicians during World War II. It was implemented again in the 1970s during the oil embargo. Now, it’s a standard practice in most states. ## Transcript Every spring, we turn our clocks an hour ahead. And in the fall, we turn them back. But why? Researchers and government officials are reevaluating the need for Daylight Savings Time. And here's what you need to know. The practice of Daylight Savings actually originates at the beginning of civilization. People adjusted their daily schedules depending on the sun which meant that the workday varied in length. Fast- forward to 1784 when Benjamin Franklin published an essay in France suggesting that rising earlier could help people save money on candles. More than 100 years later, George Vernon Hudson, a New Zealand astronomer, suggested a two- hour daylight saving shift. Then, again, in 1907, British builder, William Willett proposed advancing clocks by 80 minutes in four incremental steps. But Daylight Savings Time wasn't formally implemented until World War I when Germany attempted to drive down the demand for electrical lighting to divert more coal to the war. Thirty- one other countries quickly followed with similar policies, seizing any opportunity to save money during the war. Daylight Savings was repealed during peacetime, but was brought back during World War II in the 1973 oil embargo. Since then, various laws have made Daylight Savings Time a standard practice across America. But states can opt out as Arizona, Hawaii, and other American territories have. Yet, despite all of Daylight Savings' promises to reduce energy consumption and save money, there's little proof that it works. In 2008, researchers released a study on statewide energy consumption before and after Indiana adopted Daylight Savings Time. The data shows that Daylight Savings actually led to a 1 percent overall rise in residential electricity and that's not even the worst of it. Another 2008 study shows that Daylight Savings affects sleeping patterns and may be linked to an increase in heart attacks. Currently, Daylight Savings is implemented worldwide in over 70 countries, but as the evidence starts to pile up against the practice, Daylight Savings may just become another footnote in history. ```json [{"@context":"https://schema.org","@type":"NewsArticle","@id":"https://time.com/3734218/daylight-saving-time-spring-forward/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/3734218/daylight-saving-time-spring-forward/"},"headline":"What to Know About Daylight Saving Time","datePublished":"2015-03-06T17:20:12.000Z","dateModified":"2026-10-01T09:03:25.265Z","description":"It's time to spring forward—unless you live in Arizona or Hawaii","url":"https://time.com/3734218/daylight-saving-time-spring-forward/","keywords":["Newsfeed","society"],"thumbnailUrl":"https://static.time.com/v3/assets/bltea6093859af6183b/blt0e3b903cbcdcf0c8/698782a9cd1bbaa2c36f5951/clock.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","author":[{"@type":"Person","name":"Eliana Dockterman","jobTitle":"Correspondent","url":"https://time.com/author/eliana-dockterman/"}],"articleSection":"","image":[{"@type":"ImageObject","url":"https://static.time.com/v3/assets/bltea6093859af6183b/blt0e3b903cbcdcf0c8/698782a9cd1bbaa2c36f5951/clock.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","width":1200,"height":675,"headline":"Alarm clock daylight savings","caption":"Alarm clock daylight savings","creditText":"Getty Images","representativeOfPage":true}],"publisher":{"@type":"Organization","name":"Time","url":"https://time.com/","logo":{"@type":"ImageObject","url":"https://time.com/images/logo.png","width":528,"height":156},"foundingDate":"March 3, 1923","sameAs":["https://www.facebook.com/time","https://www.instagram.com/time/?hl=en","https://twitter.com/time","https://www.pinterest.com/timemagazine"]}},{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/tag/time-section-newsfeed/","name":"Newsfeed"}},{"@type":"ListItem","position":2,"item":{"@id":"https://time.com/3734218/daylight-saving-time-spring-forward/","name":"What to Know About Daylight Saving Time"}}]},{"@context":"https://schema.org","@type":"VideoObject","name":"Time Explains: Daylight Saving Time","description":"A recent study shows that daylight saving actually accomplishes the opposite of its intended goal: saving energy.","thumbnailUrl":"https://cdn.jwplayer.com/v2/media/gMvVuTDE/poster.jpg?width=720","uploadDate":"2013-10-30T23:42:38.000Z","contentUrl":"https://cdn.jwplayer.com/manifests/gMvVuTDE.m3u8","embedUrl":"https://time.com/3734218/daylight-saving-time-spring-forward/","duration":"PT2M26S","potentialAction":{"@type":"SeekToAction","target":"https://time.com/3734218/daylight-saving-time-spring-forward/?jw_start={seek_to_second_number}","startOffset-input":"required name=seek_to_second_number"}}] ```