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In most locations of North America, we are about to reset our clocks, moving the time forward one hour, in the “wee” hours of the morning, on Sunday, March 9
th, to begin “Daylight Saving Time,” or “Daylight Time.” In some parts of North America, such as the states of Arizona (except for the Navajo Nation lands there) and Hawaii in the US, and most of Saskatchewan in Canada, “Daylight Time” isn't used. They stay on “Standard Time” throughout the year.
North America isn't alone in the world moving it's time forward in the spring and back in the fall. Across the globe, 79 nations use “Daylight Time” in at least part of their country. The Falkland Islands stay on “Daylight Time” throughout the year. Most countries on Earth, 159 at this time, remain in “Standard Time” all year.
For those countries which use “Daylight Time,” the date on which “Daylight Time” starts and ends varies from country to country, set by government regulation or law. It also varies according to which hemisphere each country is located, north or south.
Since photography began, photographers have always been cognizant of the time of day, both because it can dramatically affect their work, both outdoors and inside, and for image documentation.
I hear the question, “When is the best time of day to shoot?” often. The answer is, of course, every time of the day is the “best” time to make photographs, as the light at these times can each set a particular mood, feeling, or tone, giving an opportunity to show the same scene in far different, and multiple “lights.”