[R] Extracting Current and Old Date

[arun]

Hi,

?max
?min

max(mydates)
#[1] "2007-06-22"
min(mydates)
#[1] "2004-02-13"
 max(mydates)-min(mydates)
Time difference of 1225 days
 max(as.numeric(mydates))-min(as.numeric(mydates))
#[1] 1225
A.K.


----- Original Message -----
From: Peter Maclean <pmaclean2011 at yahoo.com>
To: "r-help at r-project.org" <r-help at r-project.org>
Cc: 
Sent: Sunday, July 28, 2013 3:20 PM
Subject: Re: [R] Extracting Current and Old Date

#This my look trivial but has been killing my time
#I want to extract most current and old date from mydates #variable that has more than 10,000 observation. 
#Get days
# use as.Date( ) to convert strings to dates 
mydates <- as.Date(c("2007-06-22", "2007-05-21", "2004-04-13", "2004-03-11","2004-02-13",))
#Is there a way/fuction to extract mostcurrent date
#from mydates variable
mostcurrent <- as.Date(c("2007-06-22"))

#Is there a way/function to extract olddate 
#from mydates variable
olddate    <- as.Date(c("2004-02-13"))

#Days between most current and old dayte
days <- as.numeric(mostcurrent - olddate)  


Peter Maclean
Department of Economics
UDSM
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