将字符串转换为 java.time.localDate

Question

1.way

    LocalDate ld = LocalDate.parse(reservationDTO.getReservationDate());

2.way

    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");
    LocalDate dateTime = LocalDate.parse(reservationDTO.getReservationDate(), 
    formatter);

3.way

LocalDate localDate = LocalDate.parse(reservationDTO.getReservationDate());

I try convert String to java.time.localDate but for this 3 ways i have error

java.time.format.DateTimeParseException: Text '2018-7-11' could not be parsed at index 5

Answer 1

Pls notice this line

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");

Specially format yyyy-MM-dd

You configure to pass a Date of Format with 4 Char of year, 2 Char of Month and 2 Char of Date . But you are passing only 1 Digit in month.

So what you need to pass is 2018-07-11

Answer 2

If you cannot change reservationDTO.getReservationDate() you need to use only one M

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-M-dd");
LocalDate dateTime = LocalDate.parse(reservationDTO.getReservationDate(), 
formatter);

As you can see in the javadoc M/L matches with 7, 07, Jul, July, J

Otherwise, if you can change reservationDTO.getReservationDate() just transform 2018-7-11 into 2018-07-11

Answer 3

The date string you are trying to parse is not proper. Date should be 'yyyy-MM-dd' eg '2018-07-24'. You are trying to parse the string 2018-7-24

Answer 4

i think this example will resolve your problem.

 String startDateString1 = "06/27/2007";
    String startDateString2 = "2007-06-27";
    DateFormat df1 = new SimpleDateFormat("MM/dd/yyyy"); 
    DateFormat df2 = new SimpleDateFormat("yyyy-mm-dd"); 
    Date startDate1;
    Date startDate2;
    try {
        startDate1 = df1.parse(startDateString1);
        startDate2 = df2.parse(startDateString2);
        LocalDate localDate1 = DateTimeUtils.toLocalDate(startDate1);
        LocalDate localDate2 = DateTimeUtils.toLocalDate(startDate2);
        System.out.println("localDate1:" + localDate1);
        System.out.println("localDate2:" + localDate2);
        System.out.println("Result: " + localDate1.isBefore(localDate2));
    } catch (ParseException e) {
        e.printStackTrace();
    }