See ?julian > julian(Sys.Date(), Sys.Date() - 10) # 10 [1] 10 attr(,"origin") [1] "2009-01-11"
and R News 4/1. On Wed, Jan 21, 2009 at 4:37 AM, Sergey Goriatchev <serg...@gmail.com> wrote: > Hello, everyone > > I wonder if R has something similar to Excel function > EDATE(start_date; months) which returns a serial number of the date > that is the indicated number of months before of after the start date. > Example (the second column EDATE(first_column; -6)): > 01.01.1999 01.07.1998 > 02.02.1999 02.08.1998 > 06.03.1999 06.09.1998 > > I am working with a zoo object where the row names are dates and for > particular rows I need to find values that were recorded 6 months > before (or return NA if the date is before the timeseries start). > > Maybe someone knows a passable R function for that kind of operation? > > Thanks in advance for help! > > Best, > Sergey > > ______________________________________________ > 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. > ______________________________________________ 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.
