Retrieve the hour for the current or given time. Integer is returned without a leading zero.

// Print the hour for the current time

// Print the hour for the given time, in this case: 4

Optional parameter: time_t (Unix timestamp), coordinated universal time (UTC)

Returns: Integer 0-23

If you have set a timezone using zone(), beginDST(), etc. the hour returned will be local time. You must still pass in UTC time, otherwise the time offset will be applied twice.