times("23:00:00")+ times("01:00:00")
Time in days:
[1] 1

00:00:00

times("00:00:00")- times("01:00:00")
[1] -0.04166667

"23:00:00"

as.POSIXct("00:00:00", format = "%H:%M:%S", tz = "UTC")
    [1] "2017-02-07 UTC" #Not printing time. Only dates

as.POSIXct("00:00:00", format = "%H:%M:%S", tz = "UTC") -as.POSIXct("01:00:00", format = "%H:%M:%S", tz = "UTC")
        Time difference of -1 hours
        Warning message:
        In 1:0:0 : numerical expression has 2 elements: only the first used

as.POSIXct("23:00:00", format = "%H:%M:%S", tz = "UTC") + as.POSIXct("01:00:00", format = "%H:%M:%S", tz = "UTC")
Error in `+.POSIXt`(as.POSIXct("23:00:00", format = "%H:%M:%S", tz = "UTC"),  :
  binary '+' is not defined for "POSIXt" objects