MATLAB: Convert date to julian date using a reference date BC.

bcdatesMATLAB

I am trying to analyse some french oceanographic data that for some unexplainable reason uses a BC reference date. All the typical matlab functions I use to convert gregorian dates to julian assume the reference date is AD. Can anyone suggest a way to convert a BC gregorian date to a datenumber? Specifically 01 Jan 4713 BC.

Many thanks.

Serena

Best Answer

juliandate() applied to a datetime object gives that system. Conversion back is

datetime(X, 'convertfrom', 'juliandate')

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MATLAB: Convert date to specific format julian date

Datetime works nicely. I believe it came out in R2014b.

see the Datetime function

a = datetime('2016-05-04');
a.Format='yyddd'

MATLAB: Convert Modified Julian Date

The difference between datenum('06/30/11 05:05:47') (your proposed translation) and 55743.21235, is 678941

However, datenum('Nov 17, 1858,00:00') is 678942, which is a one day difference compared to your proposal.

The Nov 17, 1858 00:00 date is listed in Wikipedia, and the 678942 offset is exactly that needed to properly convert the example MJD 49987 to September 27, 1995, as documented in the US Naval Observatory web site

The evidence would seem to suggest that your calculations are off by exactly one day, and that Fangjun's calculations are correct.

Best Answer

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MATLAB: Convert date to specific format julian date

MATLAB: Convert Modified Julian Date

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