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LocalDateTime format() method in Java

Last Updated : 30 Nov, 2018
The format() method of LocalDateTime class in Java formats this date-time using the specified formatter. Syntax: 
public String format(DateTimeFormatter formatter)
Parameter: This method accepts a parameter formatter which specifies the formatter to use, not null. Returns: The function returns the formatted date string and not null. Below programs illustrate the LocalDateTime.format() method: Program 1:
Output: 
Original LocalDateTime: 2018-11-03T12:45:30
BASIC_ISO_DATE format: 20181103
ISO_LOCAL_DATE format: 2018-11-03
ISO_DATE format: 2018-11-03
ISO_LOCAL_TIME format: 12:45:30
Program 2:
Output: 
2016-09-06T12:45:30
ISO_TIME format: 12:45:30
ISO_LOCAL_DATE_TIME format: 2016-09-06T12:45:30
ISO_DATE_TIME format: 2016-09-06T12:45:30
ISO_ORDINAL_DATE format: 2016-250
ISO_WEEK_DATE format: 2016-W36-2
Reference: https://docs.oracle.com/javase/10/docs/api/java/time/LocalDateTime.html#format(java.time.format.DateTimeFormatter)
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