The withDayOfMonth() method of LocalDateTime class in Java is used to get a copy of this LocalDateTime with the dayOfMonth changed to the dayOfMonth passed as the parameter to this method. The remaining values of this LocalDateTime remains the same.
public LocalDateTime withDayOfMonth(int dayOfMonth)
Parameter: This method accepts a single mandatory parameter dayOfMonth which specifies the dayOfMonth to be set in the resultant LocalDateTime instance. The value of this dayOfMonth can range from 1 to 31.
Returns: The function returns a LocalDateTime instance with the dayOfMonth changed to the dayOfMonth passed as the parameter to this method. The remaining values of this LocalDateTime remains the same.
Exceptions: The function throws a DateTimeException if the dayOfMonth value is invalid.
Below programs illustrate the LocalDateTime.withDayOfMonth() method:
Original LocalDateTime: 2018-11-30T10:38:27.429 New LocalDateTime: 2018-11-25T10:38:27.429
Original LocalDateTime: 2015-04-06T10:15:30 New LocalDateTime: 2015-04-01T10:15:30
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