Converting numeric time to datetime POSIXct format in R

Question

I have a data frame containing what should be a datetime column that has been read into R. The time values are appearing as numeric time as seen in the below data example. I

Answer 1

Try one of these depending on which time zone you want:

t.gmt <- as.POSIXct(3600 * (tdat - 974424), origin = '2011-03-01', tz = "GMT") 

t.local <- as.POSIXct(format(t.gmt))