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Re: list of dates

  • To: mathgroup at smc.vnet.net
  • Subject: [mg88360] Re: [mg88334] list of dates
  • From: Carl Woll <carlw at wolfram.com>
  • Date: Sat, 3 May 2008 06:14:31 -0400 (EDT)
  • References: <200805020742.DAA05390@smc.vnet.net>

Roger Nye wrote:

>Hi,
>I have a list of dates in the format YYYY-MM-DD and I want to convert them 
>to a decimal value, so 1963-01-01 goes to 63.0 and 1985-07-01 goes roughly 
>to 85.5.
>
>Any suggestions on the best way to do this?
>
>Many thanks
>Roger 
>
>  
>
Perhaps Developer`CalendarData may help:

In[102]:= Developer`CalendarData[{1985, 7, 1}, "TimeInYear"]

Out[102]= 0.49589

An alternative is to use DateDifference:

In[103]:= DateDifference[{1985, 1, 1}, {1985, 7, 1}, "Year"]

Out[103]= {0.49589,Year}

Carl Woll
Wolfram Research


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