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Calendars and Software

Jon E. AhlquistDepartment of Meteorology, The Florida State University, Tallahassee, Florida

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Meteorologists need to be able to manipulate arbitrary dates in the past, present, and future. Here calendar rules for both the Julian (old) and Gregorian (modern) calendars are reviewed. The author describes free software available online to perform calendrical conversions involving (day, month, year), (day of the year, year), and Julian day number for both the Julian and Gregorian calendars.

Corresponding author address: Jon E. Ahlquist, Department of Meteorology, The Florida State University, Tallahassee, FL 32306-4520. E-mail: ahlquist@met.fsu.edu

Meteorologists need to be able to manipulate arbitrary dates in the past, present, and future. Here calendar rules for both the Julian (old) and Gregorian (modern) calendars are reviewed. The author describes free software available online to perform calendrical conversions involving (day, month, year), (day of the year, year), and Julian day number for both the Julian and Gregorian calendars.

Corresponding author address: Jon E. Ahlquist, Department of Meteorology, The Florida State University, Tallahassee, FL 32306-4520. E-mail: ahlquist@met.fsu.edu
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