Most used Java date conversions - format and parse.Accomplished using DateFormat Class and pattern
Format - Convert util.Date object to String
String pattern = "yyyy-mm-dd HH:mm:ss";
SimpleDateFormat simpleDateFormat = new SimpleDateFormat(pattern);
Date date = new Date();
System.out.println(simpleDateFormat.format(date));
Output
2023-21-22 19:21:42
Parse - Convert string to util.Date object
String pattern = "MM-dd-yyyy";
SimpleDateFormat simpleDateFormat = new SimpleDateFormat(pattern);
try{
Date date = simpleDateFormat.parse("03-15-2023");
System.out.println(date);
}
catch(ParseException ex ){
ex.printStackTrace();
}
Output
Wed Mar 15 00:00:00 GMT 2023
More...
If you want to create a date object strictly adhering to the pattern use setLenient(false). By default it's true.
Example:
String pattern = "MM-dd-yyyy";
SimpleDateFormat simpleDateFormat = new SimpleDateFormat(pattern);
try{
Date date = simpleDateFormat.parse("03-15-0");
System.out.println(date);
simpleDateFormat.setLenient(false);
date = simpleDateFormat.parse("03-15-0");
System.out.println(date);
}
catch(ParseException ex ){
ex.printStackTrace();
}
Mon Mar 15 00:00:00 GMT 1
java.text.ParseException: Unparseable date: "03-15-0"at java.base/java.text.DateFormat.parse(DateFormat.java:395) at HelloWorld.main(HelloWorld.java:17)
Furthermore ...
Nowadays, use the newer implementation as follows,
LocalDateTime date = LocalDateTime.now();
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss a");
String text = date.format(formatter);
System.out.println(text);
LocalDateTime parsedDate = LocalDateTime.parse(text, formatter);
System.out.println( parsedDate.format(DateTimeFormatter.ISO_DATE_TIME));
2023-10-24 21:18:24 pm
2023-10-24T21:18:24
Official doc: https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html
Try it in