?difftime

> difftime(strptime(a,format='%Y-%m-%dT%H:%M'),
strptime(b,format='%Y-%m-%dT%H:%M'))
Time difference of -41.06944 days
> difftime(strptime(a,format='%Y-%m-%dT%H:%M'),
strptime(b,format='%Y-%m-%dT%H:%M'), units = 'hours')
Time difference of -985.6667 hours
>



On Fri, Aug 9, 2013 at 1:37 PM, Jun Shen <jun.shen.ut@gmail.com> wrote:

> Hi all,
>
> I used strptime() to convert character strings to time and did some
> subtraction calculation.
>
> a<-'2012-07-17T07:50'
> b<-'2012-08-27T09:30'
>
> strptime(a,format='%Y-%m-%dT%H:%M')-strptime(b,format='%Y-%m-%dT%H:%M')
>
> The result shows
>
> Time difference of -41.06944 days.
>
> However when these operations performed in a dataframe, the time difference
> is in the unit of seconds. Why is that? What I really want is in hours. I
> know I can convert the results manually to hours but just wonder if there
> is way to control the unit. Thanks.
>
> Jun
>
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>
> ______________________________________________
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Jim Holtman
Data Munger Guru

What is the problem that you are trying to solve?
Tell me what you want to do, not how you want to do it.

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