convert date/time to numeric

Hi,

I convert a numeric value to date/time format and do
some operations on it. How to convert it back to a
numeric value?

Thanks,
Yu-Ling Wu

==================================================
begin <- 200103131030     
EndTime <- strptime(paste(begin), format="%Y%m%d%H%M")
+ 60 
end <- ???? 

(I want end=200103131031 instead of "2001-03-13
10:31:00")
==================================================



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