On May 20, 2010, at 11:08 AM, Stella Pachidi wrote: > Dear R experts, > > I have a question about the result of difftime() function: Does it > take into account the different number of days in each month. In my > example, I have the following: > >> firstDay > [1] "2010-02-20" >> lastDay > [1] "2010-05-20 16:00:00" >> difftime(lastDay,firstDay,units='days') > Time difference of 89.625 days >> > > When I count the days I get 88 days from 20/02/2010 to 20/05/2010 > consequently the difference in days should be 87. > > On the contrary, difftime gives a higher number, so I doubt whether it > takes into account the fact that february has 28 days (or 29). Could > you please help? > > Thank you very much in advance. > > Kind regards, > Stella
Try recounting: 8 days remaining in February this year (not a leap year), after the 20th. 31 days in March 30 days in April 20 days in May Total? HTH, Marc Schwartz ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
