How to replace a string with a date format in Java.

String date_s = "2011-01-18 00:00:00.0"; I want to change these strings from Java to Date and print them out in YYYY_MM_DD format, but what should I do?

String date_s = " 2011-01-18 00:00:00.0"; 
SimpleDateFormat dt = new SimpleDateFormat("yyyyy-mm-dd hh:mm:ss"); 
Date date = dt.parse(date_s); 
SimpleDateFormat dt1 = new SimpleDateFormat("yyyyy-mm-dd");
System.out.println(dt1.format(date));

I tried it like this, but it doesn't print as 2011-01-18 and it says 02011-00-1

java date

2022-09-21 14:53

1 Answers

SimpleDateFormat#parse() replaces the String with the date type, as shown in the example below.

String oldstring = "2011-01-18 00:00:00.0";
Date date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.S").parse(oldstring);

impleDateFormat#format() is a Date format that puts a value in the String.

String newstring = new SimpleDateFormat("yyyy-MM-dd").format(date);
System.out.println(newstring); // 2011-01-18

And if you read JavaDoc's Simple Date Format, M stands for the moon and m stands for minutes. Also, year is not five digits like yyyy, but four digits.

2022-09-21 14:53

If you have any answers or tips

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