convert date to julian date using a reference date BC.

2019 6 5
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更新时间：2019 6 6
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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

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Walter Roberson
Walter Roberson 2019-6-6

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juliandate() applied to a datetime object gives that system. Conversion back is
datetime(X, 'convertfrom', 'juliandate')

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