Built in Julian Date Converter not working?

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Evan Mossel 2018-7-20

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编辑： Evan Mossel 2018-7-20

I am using the built in function jd = juliandate(y,mo,d,h,mi,s) to convert UTC to JD. It does not work. It gives me an error that says the function is undefined. Do I need top download something for it to work? It says no downloads are needed.

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Answer 1

James Tursa 2018-7-20

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编辑：James Tursa 2018-7-20

What version of MATLAB are you using? juliandate was introduced in R2014b. Are you using an unsupported class variable as one of the inputs?

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Evan Mossel 2018-7-20

jd = juliandate(2018,7,20,11,7,00);

Errors:

Undefined function 'juliandate' for input arguments of type 'double'.

Error in jdtest3 (line 1) jd = juliandate(2018,7,20,11,7,00)

Evan Mossel 2018-7-20

编辑：Evan Mossel 2018-7-20

UPDATE: My input parameters were not correct syntax. The problem is resolved

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Answer 2

Steven Lord 2018-7-20

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There are at least two functions named juliandate in MathWorks products. The juliandate function in Aerospace Toolbox accepts double precision inputs. That's the one your code is attempting to call, but I suspect you don't have that toolbox installed. The juliandate function in MATLAB requires a datetime array as input. This function introduced in MATLAB in release R2014b, and so is the one to which James referred.

If you want to use the datetime juliandate function, you will need to convert your numeric year, month, day, etc. data into a datetime array using the datetime function then pass that datetime array into juliandate.

In the future you may find the datetime function syntax using the 'ConvertFrom' option useful if you want to convert from a Julian date.