Get the present time, in a stated timezone
presentTime(tz = "UTC")
String indicating the desired timezone. The default is
to use UTC, which is used very commonly in oceanographic work. To
get the local time, use
POSIXct()-style object holding the present time, in the
presentTime() # UTC#>  "2020-07-21 16:51:50 UTC"presentTime("") # the local timezone#>  "2020-07-21 13:51:50 ADT"