[R] date calculation

[Shi, Tao]

Hi Ben,

That must be the case!  In fact if I do:

> difftime(strptime("24NOV2004", format="%d%b%Y"), strptime("13MAY2004",format="%d%b%Y"), units="days", tz="GMT")
Time difference of 195 days


which supports your claim.

Can someone from the R development team confirm this?

Thanks!

...Tao





----- Original Message -----
> From:Ben Bolker <bbolker at gmail.com>
> To:r-help at stat.math.ethz.ch
> Cc:
> Sent:Friday, October 29, 2010 7:54:53 PM
> Subject:Re: [R] date calculation
> 
> 
> Shi, Tao <shidaxia <at> 
> href="http://yahoo.com">yahoo.com> writes:

> 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

  Presumably because this goes across a daylight-savings 
> time
adjustment?  0.0417=1/24 days is 1 hour ...

  Ben 
> Bolker

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