[R] strptime

[Liaw, Andy]

Here's a hint:

> str(unclass(z))
List of 9
 $ sec  : int [1:5] 20 56 30 3 26
 $ min  : int [1:5] 3 29 3 21 56
 $ hour : int [1:5] 23 22 1 18 16
 $ mday : int [1:5] 27 27 14 28 1
 $ mon  : int [1:5] 1 1 0 1 1
 $ year : int [1:5] 92 92 92 92 92
 $ wday : int [1:5] 4 4 2 5 6
 $ yday : int [1:5] 57 57 13 58 31
 $ isdst: int [1:5] 0 0 0 0 0

Andy

> From: David Scott
> 
> Delving into the murky world of dates and times I found this:
> 
> dates <- c("02/27/92", "02/27/92", "01/14/92", "02/28/92", "02/01/92")
> > times <- c("23:03:20", "22:29:56", "01:03:30", "18:21:03", 
> "16:56:26")
> > x <- paste(dates, times)
> > z <- strptime(x, "%m/%d/%y %H:%M:%S")
> > z
> [1] "1992-02-27 23:03:20" "1992-02-27 22:29:56" "1992-01-14 01:03:30"
> [4] "1992-02-28 18:21:03" "1992-02-01 16:56:26"
> 
> which I understand. But then 
> 
> > length(dates)
> [1] 5
> > length(times)
> [1] 5
> > length(z)
> [1] 9
> > 
> 
> which I don't.
> 
> It seems that length of a POSIXlt vector (which z is), always 
> returns 9. 
> 
> David Scott
> 
> PS: Using 1.9.0 on linux
> 
> 
> 
> 
> 
> _________________________________________________________________
> David Scott	Department of Statistics, Tamaki Campus
> 		The University of Auckland, PB 92019
> 		Auckland	NEW ZEALAND
> Phone: +64 9 373 7599 ext 86830		Fax: +64 9 373 7000
> Email:	d.scott at auckland.ac.nz 
> 
> 
> Graduate Officer, Department of Statistics
> 
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