[R] number of days

[Bill.Venables at csiro.au]

The standard answer is to use

> as.POSIXlt("2007-05-14") - as.POSIXlt("1950-01-01")
Time difference of 20952 days

If you want to ensure the time difference is in daily units, then
 
> difftime(as.POSIXlt("2007-05-14"), 
	      as.POSIXlt("1950-01-01"), units = "days")
Time difference of 20952 days

If you want to use the answer in numerical computations, then one more
coercion is usually needed

> as.numeric(difftime(as.POSIXlt("2007-05-14"), 
				   as.POSIXlt("1950-01-01"), units =
"days"))
[1] 20952 


Bill Venables
CSIRO Laboratories
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http://www.cmis.csiro.au/bill.venables/ 

-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of threshold
Sent: Monday, 14 May 2007 7:16 PM
To: r-help at stat.math.ethz.ch
Subject: [R] number of days


Hi, some of you knows how to calculate in R the number of days between
given
dates? 
issue relevant in option pricing
thanks, robert
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