Format the datetimestamp column of SWMP data
time_vec(chr_in = NULL, station_code, tz_only = FALSE)
Returns a POSIX vector if tz_only
is true, otherwise the timezone for a station is returned as a chr string
chr string of datetimestamp vector
is chr string for station (three or more characters)
logical that returns only the timezone, default FALSE
This function formats the datetimestamp column of SWMP data to the POSIXct
format and the correct timezone for a station. Note that SWMP data do not include daylight savings and the appropriate location based on GMT offsets is used for formatting. This function is used internally within data retrieval functions and does not need to be called explicitly.