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Re: Date Formatting

  • To: mathgroup at smc.vnet.net
  • Subject: [mg129023] Re: Date Formatting
  • From: James Stein <mathgroup at stein.org>
  • Date: Sun, 9 Dec 2012 10:57:52 -0500 (EST)
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  • References: <20121208063016.AD08D6929@smc.vnet.net>

Here is a simple, if ugly, routine to reformat Excel dates to
Mathematica's DateLists:

ClearAll [ reformat ];
SetAttributes [ reformat, Listable ];
reformat [ excelDate_String ] := Module [ {m, d, y},
   {m, d, y} = StringSplit[excelDate, "-"];
   m = Switch[m,
     "Jan", 1, "Feb", 2, "Mar", 3, "Apr", 4, "May", 5, "Jun", 6,
     "Jly", 7, "Aug", 8, "Sep", 9, "Oct", 10, "Nov", 11, "Dec", 12, _,
      Abort[]];
   {y, m, d} // ToExpression
   ];
reformat [ { "Mar-15-2010", "Apr-15-2011", "Dec-25-2012" } ]
reformat [ "Foo-13-1999" ]


On Fri, Dec 7, 2012 at 10:30 PM, bigchap86 <ross.d.chapman at gmail.com> wrote:
>
> Hello all,
>
> Quick question re: date formatting:
>
> So I've imported a data set externally from Excel with the intent to try to plot a time series graph. Unfortunately, the dates have come in the following format:
>
> Mar-28-2008
>
> When using the DateListPlot function, Mathematica does recognize this date format as a date, as long as you put each data point into the formula individually, and put quotations around them, e.g.:
>
> DataListPlot[{1,2},{"Mar-28-2008", "Apr-03-2009"}] works as a function, BUT if you set {"Mar-28-2008", "Apr-03-2009"}=dates, and use DataListPlot[{1,2},{dates}], it doesn't work.
>
> Anyone have ideas on how to reformat the dates so it works? It appears that there's some sort of disconnect when the dates are entered into a series.
>
> Thanks!
>



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