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The following R script subtracts two dates and get the difference in days. The dates are in the String format. Thus, the R script has to use date format to convert the strings into dates.

Code:



diff
=as.Date(strptime("2004-02-03", "%Y-%m-%d"))-as.Date(strptime("2006-02-03", "%Y-%m-%d"))
diffNum=as.numeric(diff)
print(
diff);

 


This R script calculates the difference between two dates in the format of "year-month-day" (2004-02-03 and 2006-02-03) using the strptime() and as.Date() functions. The strptime() function is used to parse the date strings, and as.Date() is used to convert them to R's Date format. The difference between the two dates is then stored in the diff object. This difference is in the format of an object of class difftime, which represents elapsed time in units of days.
Then it converts the diff object to a numeric value and assigns it to diffNum variable. Finally, it prints the difference in days between the two dates.

This script calculates the difference in days between two dates, "2004-02-03" and "2006-02-03" using the strptime function to convert the dates from character strings to R date class and then subtract the two dates. The difference is then converted to a numeric format using the as.numeric() function and printed using the print() function.



_________________
M. S. Rakha, Ph.D.
Queen's University
Canada


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