|How can I convert a DateTime variable to double time representing time as a modified Julian date?
Modified Julian date
Time is represented as a modified Julian date. A modified Julian date is the Julian date minus 2400000.5. A modified Julian date represents the number of days since midnight November 17, 1858 Universal Time on the Julian Calendar. A modified Julian date is chosen instead of the (unmodified) Julian date because the numbers become smaller and also higher precision in representing time is possible. Julian dates are often used in hydrology.