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Re: Date Formatting

  • To: mathgroup at smc.vnet.net
  • Subject: [mg129055] Re: Date Formatting
  • From: Ross Chapman <ross.d.chapman at gmail.com>
  • Date: Sun, 9 Dec 2012 23:35:14 -0500 (EST)
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  • References: <20121208063016.AD08D6929@smc.vnet.net>

Great, thanks guys.

On Sat, Dec 8, 2012 at 11:05 AM, James Stein <mathgroup at stein.org> wrote:

> 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!
> >
>



-- 
Ross Daniel Chapman
Ross.D.Chapman at gmail.com
(608) 206-5967




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