Re: [R] as.POSIXct questions

Short answer: as.POSIXct(0, origin = ISOdatetime(1970,1,1,10,0,0, tz = "GMT")) Long answer -- as.POSIXct goes through a somewhat crazy chain of method dispatch to work, and only sometimes cares about the tz argument. For your case as.POSIXct(x) -- calls --> as.POSIXct.numeric(x) -- calls -->

[R] as.POSIXct questions

The following three calls all produce the same result (my machine is in EST): > as.POSIXct(0, tz="", origin=ISOdatetime(1970,1,1,10,0,0)) [1] "1970-01-01 10:00:00 EST" > as.POSIXct(0, tz="EST", origin=ISOdatetime(1970,1,1,10,0,0)) [1] "1970-01-01 10:00:00 EST" > as.POSIXct(0, tz="GMT", origin=IS