Date conversion from POSIXct to Date in R

Question

can anyone tell me why R give such outcome below:

> as.POSIXct(\"2013-01-01 08:00\")
[1] \"2013-01-01 08:00:00 HKT\"
> as.Date(as.POSIXct(\"2013-01-01          


        

Answer 1

The problem here is timezones - you can see you're in "HKT". Try:

as.Date(as.POSIXct("2013-01-01 07:00", 'GMT'))
[1] "2013-01-01"

From ?as.Date():

["POSIXct" is] converted to days by ignoring the time after midnight in the representation of the time in specified timezone, default UTC