Java SimpleDateFormat Cannot format given Object as a Date

Question

I am trying to convert string to date using date format and used the following code but its shows an error.

      public static Date ConvertStringtodate(String Date) throws ParseException {
            DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
            Date Teststart = dateFormat.parse(Date);
            return Teststart;
        }

        public static void main(String[]agrs) throws ParseException {
            System.out.println(ConvertStringtodate("2022.02.10 17:54:55"));
        }

Here is the error

Exception in thread "main" java.lang.IllegalArgumentException: Cannot format given Object as a Date at java.text.DateFormat.format(DateFormat.java:310) at java.text.Format.format(Format.java:157)

hh in your format pattern should be HH - read the documentation for SimpleDateFormat closely to see the difference. — Jon Skeet
– Jon Skeet, Commented Feb 10, 2022 at 12:08
Although it's odd that the exception mentions format when you're actually calling parse - please could you include the full stack trace? — Jon Skeet
– Jon Skeet, Commented Feb 10, 2022 at 12:10
Thanks @JonSkeet This is what i received in console Exception in thread "main" java.lang.IllegalArgumentException: Cannot format given Object as a Date at java.text.DateFormat.format(DateFormat.java:310) at java.text.Format.format(Format.java:157) at pages.CommonFunctionOfpages.ConvertStringtodate(CommonFunctionOfpages.java:317) at pages.CommonFunctionOfpages.main(CommonFunctionOfpages.java:322) Process finished with exit code 1 — Zakaria Shahed
– Zakaria Shahed, Commented Feb 10, 2022 at 12:16
The code you've provided wouldn't produce that stack trace - it would produce a stack trace calling java.text.DateFormat.parse. (I've just tried your exact code.) In future, please make the code you provide reflect the error you provide. As well as the answer you've received, I'd strongly advise: a) start following Java naming conventions; b) use java.time instead of the old java.util.Date and java.text.SimpleDateFormat classes. — Jon Skeet
– Jon Skeet, Commented Feb 10, 2022 at 12:36

Shubham Patil · Accepted Answer · 2024-04-11 23:22:35Z

3

At the main method, you are sending date as 2022.02.10 17:54:55. However, you wrote format of the pattern as yyyy-MM-dd hh:mm:ss. Change the pattern at the SimpleDateFormat constructor as yyyy.MM.dd HH:mm:ss.

edited Apr 11, 2024 at 23:22

Shubham Patil

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answered Feb 10, 2022 at 12:14

BGForDevelopers

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Comments

lungu · Accepted Answer · 2022-11-16 06:58:47Z

0

The problem for me was the slashes '/' in the date input. for some reason the. The input string was "01/01/1991" instead of "01-01-1991". So I just replaced the slashes with dashes and everything worked just fine.

private Date convertStringToDate(String payload) throws ParseException {
        payload = payload.replace("/", "-");
        SimpleDateFormat formatter = new SimpleDateFormat("dd-MM-yyyy", Locale.ENGLISH);
        java.util.Date utilDate = formatter.parse(payload);
        return new Date(utilDate.getTime());
    }

answered Nov 16, 2022 at 6:58

lungu

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