Categories: java

Cannot format LocaDateTime given Object as a Date [duplicate]

3 answers

I want to format a date, using

DateFormat dateFormat = new SimpleDateFormat("yyyyMMddHHmmss"); return dateFormat.format(; 

but I have the error:

java.lang.IllegalArgumentException: Cannot format given Object as a Date 

All answers to this question, which has the identifier 61236757

The best answer:

Do not use outdated Date/Time formatter, DateFormat. Use a modern Date/Time formatter, DateTimeFormatter instead.

import java.time.LocalDateTime; import java.time.format.DateTimeFormatter;  public class Main {     public static void main(String[] args) {         DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMddHHmmss");         System.out.println(formatter.format(;     } } 



There are two different methods of dealing with dates in Java. DateFormat is for the old, not-to-be-used java.util.Date package. Your LocalDateTime is from the much better java.time package, and needs to use a DateTimeFormatter:

DateTimeFormatter format = DateTimeFormatter.ofPattern("yyyyMMddHHmmss"); return format.format(; 

you would need to use DateTimeFormatter instead of DateFormatter as the object you are trying to format is LocalDateTime.

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