[R] subtract a time period from a date

[arun]

HI,
Try this:
 dat1<-"2011-05-01 CEST"
 dat2<-as.POSIXlt(dat1)
dat2$mday<-dat2$mday-30
dat2
#[1] "2011-04-01"
A.K.




----- Original Message -----
From: paladini <paladini at beuth-hochschule.de>
To: r-help at r-project.org
Cc: 
Sent: Tuesday, October 30, 2012 6:25 AM
Subject: [R] subtract a time period from a date

Hello everybody,
how can I reduce e.g. 30 days from a date?
When I do  the following  "2011-05-01 CEST" -"2011-04-01 CEST" I get: "Time difference of 30 days"
an thats fine.

But when I try "2011-05-01 CEST" - 30 I get nonsense.
So how can I subtract some days, month or years from a date?



thanking you in anticipation


Claudia Paladini

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