[R] difference between 2 dates: IN MONTHS the way Mothers compute it

[Gabor Grothendieck]

zoo has the "yearmon" class which will convert a date to a year +
0/12 to 11/12 to represent the month, disregarding the day, so:

library(zoo)
12 * as.numeric((as.yearmon("2006-03-07") - as.yearmon("2006-02-06"))) # 1

On 3/10/06, Smith, Phil <pzs6 at cdc.gov> wrote:
> Hi R-people:
>
> I need a function to compute the number of months between 2 dates, in the same way a mother would do it.
>
> For example, if a kid is born on February 6, the number of months between that date and March 7 is exactly 1 month, although it is only 29 days.
>
> Thank you!
> Phil Smith
> CDC
>
>
>
>
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