Hi,
My time zone in Montreal is "Standard time zone: UTC/GMT -5 hours" (see
<http://www.timeanddate.com/worldclock/city.html?n=165>).
Yet, in R (POSIXct objects) I must specify the opposite, i.e. "UTC+5":
dateMontreal = as.POSIXct("2011-01-15 05:00:00", tz="EST")
dateMontreal2 = as.POSIXct("2011-01-15 05:00:00", tz="UTC+5")
wrongdateMontreal = as.POSIXct("2011-01-15 05:00:00", tz="UTC-5")
dateLondon = as.POSIXct("2011-01-15 10:00:00", tz="UTC0")
difftime(dateMontreal, dateLondon)
Time difference of 0 secs
difftime(dateMontreal2, dateLondon)
Time difference of 0 secs
difftime(wrongdateMontreal, dateLondon)
Time difference of -10 hours
Is there a reason for this counter-intuitive convention?
Denis
R version 2.13.1 (2011-07-08)
Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)
locale:
[1] fr_CA.UTF-8/fr_CA.UTF-8/C/C/fr_CA.UTF-8/fr_CA.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
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