Message-ID: <7cb007bd0901210137k4afee7b8tb568fea0bd881058@mail.gmail.com>
Date: 2009-01-21T09:37:02Z
From: Sergey Goriatchev
Subject: Looking for a special date function in R
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