Format date from String to LocalDate

Question

I have a problem parsing a String to LocalDate .
According to similar questions on Stackoverflow and documentation I am using the correct values dd (day of the month), MM (month of the year) and yyyy (year).

My String

String mydate = "18.10.2022 07:50:18";

My parsing test code

System.out.println(
    LocalDate.parse(testPasswordExp)
             .format(DateTimeFormatter.ofPattern("dd.MM.yyyy HH:mm:ss")
    )
);

Error:

Caused by: java.lang.RuntimeException:
java.time.format.DateTimeParseException:
Text '18.10.2022 07:50:18' could not be parsed at index 0

Answer 1

The main problem of your code example is that you first parse the String to a LocalDate without the use of a suitable DateTimeFormatter and then format() it with a DateTimeFormatter that tries to format hour of day, minute of hour and second of minute which just aren't there in a LocalDate .

You can parse this String to a LocalDate directly, but better parse it to a LocalDateTime because your String contains more than just information about

• day of month
• month of year
• year

Your myDate (and probably the testPasswordExp , too) has a time of day. You can get a LocalDate as the final result that way, too, because a LocalDateTime can be narrowed down toLocalDate() .

A possible way:

public static void main(String[] args) {
    // example datetime
    String testPasswordExp = "18.10.2022 07:50:18";
    
    System.out.println(
        LocalDateTime   // use a LocalDateTime and…
            .parse(     // … parse …
                testPasswordExp,    // … the datetime using a specific formatter,
                DateTimeFormatter.ofPattern("dd.MM.uuuu HH:mm:ss")
            ).toLocalDate() // then extract the LocalDate
    );
}

Output:

2022-10-18

Answer 2

You don't use the specified format for parsing, you use it to format the parsed date.

LocalDate.parse(mydate)

uses the default ISO_LOCAL_DATE format. You are looking for this overload:

LocalDate.parse(mydate, DateTimeFormatter.ofPattern("dd.MM.yyyy HH:mm:ss"))

This method uses the specified format for parsing string to date.

Note that you are using LocalDate , meaning it will throw away the time part, keeping only the date after parsing. You probably meant to use LocalDateTime .

Answer 3

You can use

    String mydate = "18.10.2022 07:50:18";


    LocalDate ld = LocalDate.parse(mydate, DateTimeFormatter.ofPattern("dd.MM.yyyy HH:mm:ss"));

    System.out.println(ld.toString());