System.DateUtils.DateTimeToJulianDate

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Delphi

function DateTimeToJulianDate(const AValue: TDateTime): Double;

C++

extern DELPHI_PACKAGE double __fastcall DateTimeToJulianDate(const System::TDateTime AValue);

Properties

Type	Visibility	Source	Unit	Parent
function	public	System.DateUtils.pas System.DateUtils.hpp	System.DateUtils	System.DateUtils

Description

Converts a TDateTime value into a Julian date.

Call DateTimeToJulianDate to convert a TDateTime value into 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, geophysicists, and others who need an unambiguous dating system based on continuing day counts.

See Also

• DateTimeToModifiedJulianDate

• JulianDateToDateTime

• ModifiedJulianDateToDateTime

• Convert

• TryJulianDateToDateTime

• TryModifiedJulianDateToDateTime

• Date and Time Support

Code Examples

• DTTransform (C++)
• DTTransform (Delphi)