Pure parse of a Google GoogleEventDateTime to a UTC Date. Uses the RFC3339 dateTime (which carries its own offset) when present, else an all-day date as UTC midnight. Returns null on absent/invalid.
dateTime
date
null
Optional
Pure parse of a Google GoogleEventDateTime to a UTC Date. Uses the RFC3339
dateTime(which carries its own offset) when present, else an all-daydateas UTC midnight. Returnsnullon absent/invalid.