Returns a copy of this
LocalDateTime with the year altered.
The time does not affect the calculation and will be the same in the result. If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.
This instance is immutable and unaffected by this method call.
|the year to set in the result, from MIN_YEAR to MAX_YEAR|
LocalDateTime based on this date-time with the requested year, not null
|if the year value is invalid|