End daylight saving time and clock changes – Health, Consumption, Climate

Citizen Association for Equitable and Sustainable Time (ACHED / ACHEDFR)

Formerly: “Association against double summer time (DST) and for reducing the advances of legal time”

Public information website heure-ete.net, updated since 2004.

In 2026, ACHED renews its call to end “double summer time” by returning to a more natural time zone alignment: Back to the Time Zone (UTC+1 or UTC+0). Infographics, figures (billions of euros, millions of tonnes of CO₂), analyses, letters and petitions support this call. Thank you for reading, understanding, and joining urgently.

I shared the press release. ACHED writes to France's highest authorities during the heatwave to put an end to double summer time

I shared the press release. Heatwave – It is time to bring legal time back in line with the climate

I shared the heatwave press release. Press release on Morocco's return to GMT

I shared the homepage this week.

I shared the daylight saving time petition this week. Sign against daylight saving time, which causes fatigue without saving energy

📚 I want to understand

📰 Read the press releases

I have read the press releases. Open the page

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📰 Understand the health impacts

I have read the 2018 chronobiologists' letter: "Standard time is better than advanced time." Read the letter ↗

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📰 Understand the impact on energy efficiency

I have read ACHED's 2023 position paper. . Open the position paper ↗

I have read ADEME's 2014 press release and confirmed that it concluded daylight saving time increased residential air-conditioning demand. . Open the archived ADEME 2014 press release ↗

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End daylight saving time and clock changes – Health, Consumption, Climate

⚡ I want to take action 🧪

📚 I want to understand