[R] date calculation

[Phil Spector]

Tao -
    The documentation for the difftime function says:

Function ‘difftime’ calculates a difference of two date/time
      objects and returns an object of class ‘"difftime"’ with an
      attribute indicating the units.

So that answers your question.

If you want it to be an integer, you're certainly free to make it one:

> as.integer(difftime(strptime("24NOV2004", format="%d%b%Y"), 
+                     strptime("13MAY2004",format="%d%b%Y"), units="days"))
[1] 195

 					- Phil Spector
 					 Statistical Computing Facility
 					 Department of Statistics
 					 UC Berkeley
 					 spector at stat.berkeley.edu



On Fri, 29 Oct 2010, Shi, Tao wrote:

> Hi list,
>
> Could someone explain to me why the following result is not a integer?
>
>
>> difftime(strptime("24NOV2004", format="%d%b%Y"), strptime("13MAY2004",
>> format="%d%b%Y"), units="days")
> Time difference of 195.0417 days
>
> I'm using R2.12.0 on WinXP.
>
> Thanks!
>
> ...Tao
>
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