This functions calls upon the UVI API from data.gov.sg
and returns a data frame of the different measures of the UVI across
Singapore and returns the closest UVI value presently and for the past
few hours. This data provided by the API is updated hourly.
Usage
uvi(date_time = "")
Value
A dataframe containing the current and past hourly UVI
Arguments
date_time
Defaults to current (SGD) time. Format: YYYY-MM-DDTHH:MM:SS