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CalcMJD
The CalcMJD function converts a Julian Date to a Modified Julian Date, or "MJD".
nMJD = CalcMJD( nJD )
nJD is the Julian Date
(e.g., 2454213.594103).
nMJD is the Modified Julian Date (e.g.,
54213.094103).
To calculate the Julian Date from date and time components, use JDtoDateTime.