On Fri, 7 Jan 2011, Rustamali Manesiya wrote:
Hello I have trouble getting my original datetime back see below. I hope I
am missing something. Please help.
The numeric form (which you should never use) has an origin at
midnight in UTC, not EST.
Note too that 'EST' is not very plausible for your timezone (or are
you in Canada?): see ?Sys.timezone.
tt <- as.POSIXct(ttn,origin='1970-01-01',tz="UTC")
attr(tt, "tzone") <- "EST"
tt
[1] "2011-01-07 07:49:13 EST"
tt <- as.POSIXct("2011-01-07 07:49:13", tz="EST")
tt
[1] "2011-01-07 07:49:13 EST"
ttn <- as.numeric(tt)
ttn
[1] 1294404553
tt <- as.POSIXct(ttn,origin='1970-01-01',tz="EST")
tt
[1] "2011-01-07 12:49:13 EST"
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Brian D. Ripley, rip...@stats.ox.ac.uk
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