It was local time. It also seems that in some countries, it was 8:00pm, not 8:30.
Earth hour starts at 8:30pm at your local time and finishes at 9:30pm your local time. In 2011, Earth Hour is on 26 March.
Earth Hour : 23rd March 2013It is observed from 20:30 to 21:30 hour local time of each place.
Earth Hour around the world was held from 8:00pm - 9:00pm, local time, on 28 March 2009. Earth Hour 2009 in Australia was 8:30pm-9:30pm on Saturday 28 March 2009.
In most parts of the world, Earth Hour 2009 took place from 8:00pm-9:00pm on the last Saturday of March. In Australia, Earth Hour was held from 8:30pm to 9:30pm.
A standard hour is an hour of production which should be used doing work.
The Earth Hour is celebrated on the last Saturday of March every year. It is observed from 20:30 to 21:30 hour local time of each place. The day is observed in order to conserve energy and draw the world’s attention to the cause of environmental degradation.
Hi: Earth Hour is an hour at which, every year, people and organizations around the world do something in support of saving the earth (electricity, fuels, waste, conservation, etc).This year, it's 31 March at 8h30pm.
You can promote Earth Hour by organizing local events, raising awareness through social media campaigns, and encouraging friends and family to participate. You can also reach out to local businesses and schools to involve them in the initiative and spread the message of the importance of taking action against climate change.
Earth Hour was created in 2007.
23 hours instead of one day (because not all of the world has a day of 24 hours)
Earth Hour takes place from 8:00 - 9:00 pm Eastern Time in Atlanta, Georgia. It occurs from 8 - 9pm in their respective time zone in every city, except for Australia, where it occurred from 8:30-9:30pm in 2009.
In 2010,128 countreis participated in earth hour