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)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
- Delivered-to: l-mathgroup@wolfram.com
- Delivered-to: mathgroup-newout@smc.vnet.net
- Delivered-to: mathgroup-newsend@smc.vnet.net
- 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!
>
- References:
- Date Formatting
- From: bigchap86 <ross.d.chapman@gmail.com>
- Date Formatting