Hi, 
I have a dataset including monthly date from 1971-01-01 to 2009-01-01. The dates are character variables.

I want to select the subsample from my original data, so I use
mydata3<-window(mydata,start="1972-02-01",end="2005-02-01"),
or mydata3<-window(mydata, start=as.date("1972-02-01"),end=as.date("2005-02-01"))
or mydata3<-window(mydata, start=c(1972-02-01),end=c(2005-02-01))

but I constantly receive 
Error in attr(x, "tsp") <- c(1, NROW(x), 1) : 
  invalid time series parameters specified

I don't know how to fix it in this case.

Many thanks 
YD



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