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MJD modifies this Julian Date in two ways. The MJD begins at midnight rather than noon (the .5 in the formula), in keeping with more standard conventions and modern representation of time. Secondly, for simplicity, the first two digits of the Julian Date are removed.
1 Ιαν 2000 · Use this tool to convert a specified calendar date/time to an equivalent Julian Day (JD) number. Enter a date as year - month - day (e.g., 2000-01-01) with an optional time separated from the date with either a space or underbar _ (e.g., 2000-01-01 12:00). The time can also be entered as decimal days (e.g., 2000-01-01.5).
CalendarLabs makes determining the Julian and Gregorian dates for today or any date a breeze. Here is how you can do it. Enter the Gregorian date, hours, and minutes and click ‘Calculate,’ the tool will generate the corresponding Julian date in many formats, including the modified Julian date.
The modified Julian date (MJD) is related to the Julian date (JD) by the formula: MJD = JD - 2400000.5 MJD's are sometimes used for modern-era scientific data.
To convert Julian Dates to month/day/year you might wish to use the Julian Day Calculator, a Java-based program that was written by the folks at Numerical Recipes. To get the integer MJD from their JD, use MJD = JD - 2400001
Enter either a Calendar date, or a Julian date and click Calculate. This calculator is a modified version from the U.S. Naval Observatory. Convert the calendar date to julian date and vice versa.
Change civil date to calculate Julian Day Number and day-of-week, or vice versa. After changing a text box, click outside of the calculator, or press tab, to update all other data. (Don't press return.) In Auto mode, civil calendar changes from Julian to Gregorian between October 5/16, 1582.
