Adding time to POSIXct object in R

datetime, posixct, r

Solution

`POSIXct` objects are a measure of seconds from an origin, usually the UNIX epoch (1st Jan 1970). Just add the requisite number of seconds to the object:

x <- Sys.time()
x
[1] "2012-08-12 13:33:13 BST"
x + 3*60*60 # add 3 hours
[1] "2012-08-12 16:33:13 BST"

Problem

I would like to add 1 hour to a POSIXct object, but it does not support '+'. This command: ``` as.POSIXct("2012/06/30","GMT") + as.POSIXct(paste(event_hour, event_minute,0,":"), ,"%H:%M:$S") ``` returns this error: ``` Error in `+.POSIXt`(as.POSIXct("2012/06/30", "GMT"), as.POSIXct(paste(event_hour, : binary '+' is not defined for "POSIXt" objects ``` How can I add a few hours to a POSIXct object ?

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