difftime objects do not accept 'years' as a value for 'units', so you have
to change it to numeric.
as.numeric(age_days, units="days") / 365.242
The units="days" is not needed since you specified it in the call
to difftime, but it needs to be in one of those places.
Bill Dunlap
TIBCO Software
wdunlap tibco.com
On Thu, Aug 4, 2016 at 11:05 AM, Thomas Subia via R-help <
r-help@r-project.org> wrote:
> Colleagues,
>
> age_days <- difftime(Date,DOM,units="days")
> date_vals$age_yrs <- age_days/365.242
>
> I'm trying to calculate the number of years between DOM and Date.
> The output reads
>
> DOM Date age_yrs
> 1 2005-04-04 2015-05-13 10.10563 days
>
> How does one not output days?
>
> ______________________________________________
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>
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