MJD2DATE Gregorian calendar date from Julian day number. [YEAR, MONTH, DAY, HOUR, MINUTE, SECOND] = MJD2DATE(MJD) returns the Gregorian calendar date (year, month, day, hour, minute, and second) corresponding to the Julian day number JDAY. Start of the JD (Julian day) count is from 0 at 12 noon 1 JAN -4712 (4713 BC), Julian proleptic calendar. Note that this day count conforms with the astronomical convention starting the day at noon, in contrast with the civil practice where the day starts with midnight. Astronomers have used the Julian period to assign a unique number to every day since 1 January 4713 BC. This is the so-called Julian Day (JD). JD 0 designates the 24 hours from noon UTC on 1 January 4713 BC (Julian calendar) to noon UTC on 2 January 4713 BC.

- days2hms DAYS2HMS Convert days into hours, minutes, and seconds.
- jd2date JD2DATE Gregorian calendar date from modified Julian day number.
- mjd2jd MJD2JD Modified Julian day number from Julian day number.

- atmdata_regrid ATMDATA_REGRID Change of rectangular grid for atmdata
- mjd2doy MJD2DOY Conversion of MJD to day of year
- mjd2month MJD2MONTH Conversion of MJD to month
- mjd2string MJD2STRING Converts a MJD value to a date string

0001 function [year, month, day, hour, minute, second] = mjd2date(mjd) 0002 %MJD2DATE Gregorian calendar date from Julian day number. 0003 % 0004 % [YEAR, MONTH, DAY, HOUR, MINUTE, SECOND] = MJD2DATE(MJD) returns the 0005 % Gregorian calendar date (year, month, day, hour, minute, and second) 0006 % corresponding to the Julian day number JDAY. 0007 % 0008 % Start of the JD (Julian day) count is from 0 at 12 noon 1 JAN -4712 0009 % (4713 BC), Julian proleptic calendar. Note that this day count conforms 0010 % with the astronomical convention starting the day at noon, in contrast 0011 % with the civil practice where the day starts with midnight. 0012 % 0013 % Astronomers have used the Julian period to assign a unique number to 0014 % every day since 1 January 4713 BC. This is the so-called Julian Day 0015 % (JD). JD 0 designates the 24 hours from noon UTC on 1 January 4713 BC 0016 % (Julian calendar) to noon UTC on 2 January 4713 BC. 0017 0018 % Sources: - http://tycho.usno.navy.mil/mjd.html 0019 % - The Calendar FAQ (http://www.faqs.org) 0020 0021 % Author: Peter J. Acklam 0022 % Time-stamp: 2002-03-03 12:50:30 +0100 0023 % E-mail: pjacklam@online.no 0024 % URL: http://home.online.no/~pjacklam 0025 0026 nargsin = nargin; 0027 error(nargchk(1, 1, nargsin)); 0028 0029 % We could have got everything by just using 0030 % 0031 % jd = mjd2jd(mjd); 0032 % [year, month, day, hour, minute, second] = jd2date(jd); 0033 % 0034 % but we lose precision in the fraction part when MJD is converted to JD 0035 % because of the large offset (2400000.5) between JD and MJD. 0036 0037 jd = mjd2jd(mjd); 0038 [year, month, day] = jd2date(jd); 0039 0040 if nargout > 3 0041 fmjd = mjd - floor(mjd); 0042 [hour, minute, second] = days2hms(fmjd); 0043 end

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