Converting character to timestamp in dataframe

Question

I have a timestamp in a dataframe that is recognized as a character class. For some reason, I am not able to convert it to a poxis timestamp.

Here is a sample of the da

Answer 1

Z means it's UTC time. So one option is just to strip out the letter and convert to POSIXCT with tz="UTC" . As the dataframe is not easily reproducible, I'm just using the vector of two dates:

x<- as.POSIXct( gsub(pattern = "[A-Z]",replacement = " ",
                 x = c( "2016-11-01T00:45:00.000Z","2016-11-01T00:39:00.000Z") ) ,
                 tz="UTC" ) 
x
class(x)