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How to Calculate the Length of Daylight

In many countries, there is a specific day of the year where you switch to Daylight Savings Time by setting your clock forward. This time allows for longer working days during the sunny months of summertime because the sun sets later in the day. You may want to calculate the difference for the amount of daylight in your area during Daylight Savings Time compared to when the clock is set backward. The process is relatively simple if you know the specific time of sunrise and sunset for a specific date in your area.

Calculator

Instructions

- 1
  Obtain the sunrise and sunset times for your area on a specific day. Several websites such as Time and Data, Sunrise Sunset and the US Navy offer tools to determine the sunrise and sunset times for specific dates.
- 2
  Change the hours to military times. If the sunset time is 6 p.m., this is 18 in military time.
- 3
  Subtract the sunrise hour from the sunset hour. Subtract the amount of minutes for the time at sunrise from the amount of minutes for the time at sunset.
- 4
  Record the hours and minutes to determine the amount of daylight there was on that specific day. The final result will be in hours and minutes, such as 9 hours and 35 minutes.

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