I have the following data frame:
>head(d)
Smed Time TTFB
1 186 2014-03-19 20:13:00 6
2 196 2014-03-19 21:23:00 0
3 186 2014-03-19 19:33:00 22
4 186 2014-03-19 14:43:00 134
5 186 2014-03-19 23:53:00 36
> str(d)
$ Smed : Factor w/ 71 levels "1033","1038",..: 14 16 14 14 14 14 47 14 14 68 ...
$ Time : POSIXct, format: "2014-03-19 20:13:00" "2014-03-19 20:13:00" "2014-03-19 20:13:00" "2014-03-19 20:13:00" ...
$ TTFB : int 6 0 22 134 36 96 61 37 28 19 ...
How do i do a time comparison with POSIXct time format to get data say between 18:13 and 23:20