Getting Error Java.Text.Parseexception: Unparseable Date: (At Offset 0) Even If the Simple Date Format and String Value Are Identical

java.text.ParseException: Unparseable date. dd MMM yyyy HH:mm:ss format

Try with:

String time = "24 Apr 2021 11:56:44";
Date timeOnLine = new SimpleDateFormat("dd MMM yyyy HH:mm:ss", Locale.US).parse(time);

Parse a Date String to another format

The variable names show that you are German, most likely working on a system with German language and date formatting. By default this also affects SimpleDateFormat output and parsing (unless you specify the Locale to be used)!

Between the German and the English/US formatted date string there is a small but significant difference:

Locale.ENGLISH: "Mon, 27 Jan 2020 21:31:16 +0100";
Locale.GERMAN:  "Mo., 27 Jan 2020 21:31:16 +0100";

The date string you parse however uses the English date format, therefore you have to explicitly set Locale.US or Locale.ENGLISHwhen constructing the SimpleDateFormat:

simpleDateFormat = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss Z", Locale.ENGLISH);

Afterwards you can parse the sample date string in your question.

Unparseable date Exception java date pattern

Use Locale.US so that it considers the month names in US format

SimpleDateFormat("dd-MMM-yyyy",Locale.US)

See this code run live at IdeOne.com.

Need help parsing String into date

you can set language as English here

SimpleDateFormat format = new SimpleDateFormat("EEE MMM dd HH:mm:ss zzz yyyy", Locale.ENGLISH);
Date date = null;

try {
    date = format.parse("Tue Nov 26 12:05:19 CET 2019");
} catch (ParseException e) {
    e.printStackTrace();
}
System.out.println(date);

java.text.ParseException: Unparseable date

Your pattern does not correspond to the input string at all... It is not surprising that it does not work. This would probably work better:

SimpleDateFormat sdf = new SimpleDateFormat("EE MMM dd HH:mm:ss z yyyy",
                                            Locale.ENGLISH);

Then to print with your required format you need a second SimpleDateFormat:

Date parsedDate = sdf.parse(date);
SimpleDateFormat print = new SimpleDateFormat("MMM d, yyyy HH:mm:ss");
System.out.println(print.format(parsedDate));

Notes:

you should include the locale as if your locale is not English, the day name might not be recognised
IST is ambiguous and can lead to problems so you should use the proper time zone name if possible in your input.

Keep getting ParseException: Unparseable date

Try this:

SimpleDateFormat formatter = new SimpleDateFormat("EEE MMM dd HH:mm:ss zzz yyyy", Locale.US);
        Date date = null;
        try {
            date = formatter.parse("Sun May 20 18:07:13 EEST 2018");
        } catch (ParseException e) {
            e.printStackTrace();
        }
        System.out.println(date);

Parsing date crashes in Android 12

Adding the Local solved the issue. Works fine on both android 7 and 12.

DateFormat f = new SimpleDateFormat("EEE MMM dd HH:mm:ss zzzz yyyy", Locale.US);