[R] difftime in years

[William Dunlap]

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 at 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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