java.text.ParseException: Unparseable date: "Wed Mar 11 2020"

Three points:

1. Do use java.time, the modern Java date and time API, for your date and time work.
2. Rather than taking a substring of the string you receive, I’d prefer to parse the entire string.
3. Your format pattern string must match the string you are trying to parse (and vice versa). Exactly.

In code:

DateTimeFormatter formatter = 
        DateTimeFormatter.ofPattern(
            "EEE MMM d uuuu HH:mm:ss 'GMT'xx (zzzz)",  // Pattern to match your input strings.
            Locale.UK                                  // Locale determines human language used to parse name of month and such.
        )
;
String dateString = "Wed Mar 11 2020 05:29:01 GMT+0100 (West Africa Standard Time)";
ZonedDateTime zonedDateTime = ZonedDateTime.parse(dateString, formatter);

Generate a string.

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

Output from this snippet is:

2020-03-11T03:29:01+01:00[Africa/Lagos]

Use java.time. The modern API is sol much nicer to work with. The Date class that you used is poorly designed, and SimpleDateFormat notoriously troublesome. Don’t use any of those.

Parse the entire string. Taking a substring of length 15 will cause some readers of your code to wonder, some ask “WTF?”, some to use their precious time for counting to make sure that 15 is the correct length. Also taking a substring of length 15 is fragile unless you’re sure that the abbreviations for day of week and for month always have length three and day of month is always written with two digits (May 02, not May 2). Furthermore it’s easier to parse more than you need and throw information away later, than to parse just what you think you need and later discover that you needed one more bit.

Specifying the format. Since your string begins with a day of week abbreviation, you need a format pattern string that begins with the format pattern letter for day of week. In this case EEE (or E or EE) for the abbreviation (EEEE would have meant the day written in full, like Wednesday). So YYYY-MM-dd is all wrong. EE MMM dd HH:mm:ss z yyyy comes closer and can parse day of week, month and day of month. Then comes a space and a year in the input, but your format pattern string has yyyy for year at the end instead, so this is where parsing breaks for you. If writing the correct format pattern string teases (as it does for many), a trick is to try something and first use the formatter for formatting a date and time. If the result differs from the string we would like to parse, it usually gives us a hint about what’s wrong.

Link: Oracle tutorial: Date Time explaining how to use java.time.

Try this.

    SimpleDateFormat sdf3 = new SimpleDateFormat("EEE MMM dd yyyy");
    Date d1 = null;
    try {
        d1 = sdf3.parse("Wed Mar 30 2016");
    } catch (Exception e) {
        e.printStackTrace();
    }

    System.out.println(sdf3.format(d1));

}

Output:

Wed Mar 30 2016

First you need to control your computer language. According to your computer's language. You must write day's name and month's name in your computer's language

Actually you had better convert this 'Wed' according to your language.

My computer's language is turkish. I used below code how to use day's name on date on java.

public static void main(String[] args) { 
    String sDate1 = "Per Mar-11-2020";  
    String sDate2 = "Perşembe Mar-11-2020";  
    Date date1;
    try {
        date1 = new SimpleDateFormat("EEE MMM-dd-yyyy").parse(sDate1);
        System.out.println(sDate1+"\t\t"+date1);
        date1 = new SimpleDateFormat("EEEEE MMM-dd-yyyy").parse(sDate2);
        System.out.println(sDate2+"\t\t"+date1);
    } catch (ParseException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }       
}

output :

Per Mar-11-2020     Wed Mar 11 00:00:00 AST 2020
Perşembe Mar-11-2020        Wed Mar 11 00:00:00 AST 2020

Also you need to be carefull such as :

if your String is Per Mar-11-2020, you need to write EEE MMM-dd-yyyy.

Or

if your String is Per Mar 11 2020, you need to write EEE MMM dd yyyy.

Or

if your String is Per Mar/11/2020, you need to write EEE MMM/dd/yyyy.