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RAD Studio VCL Reference
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DateUtils.DateTimeToJulianDate Function
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RAD Studio VCL Reference
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Converts a TDateTime value into a Julian date.
function DateTimeToJulianDate(const AValue: TDateTime): Double;
Double DateTimeToJulianDate(const TDateTime AValue);
Call DateTimeToJulianDate to convert a TDateTime value the corresponding Julian date.
The Julian date is the number of days, including fractional days, since 4713 BC January 1, Greenwich noon. Julian dates are used by astronomers, geophysicist, and others who need an unambiguous dating system based on continuing day counts.
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