How to inspect Datenum code

[gciriani]

I'm getting an error executing datenum, and I would like to inspect the code
to understand what's wrong with my data. How do I access the code please?

The error message is the following:
error: monthstart(1.5): subscripts must be either integers 1 to (2^31)-1 or
logicals
error: called from
    datenum at line 154 column 9
    datetick>__datetick__ at line 213 column 15
    datetick at line 56 column 5
    Brier at line 66 column 3



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Giovanni Ciriani - Windows 10, Octave 4.2.1, configured for x86_64-w64-mingw32
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