How to convert String to Date in java whatever system format is

This question already has an answer here:

Parse any date in Java 3 answers

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You're trying to convert a String in EEEE, MMMM dd, yyyy format with the format of dd/MM/yyyy ...

Start by using the correct format for the String you trying to convert, the use what ever format you want to convert it back...

SimpleDateFormat from = new SimpleDateFormat("EEEE, MMMM dd, yyyy");
SimpleDateFormat to = new SimpleDateFormat("dd/MM/yyyy");

String value = to.format(from.parse(dateString));

Now you could use something like DateUtils.parseDate(String, String[]) which allows to supply a number of different formats, but is still limited to what you might know.

A better solution would be to store the Date value directly within the database.

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You are passing wrong parameter to SimpleDateFormater

Use SimpleDateFormat format = new SimpleDateFormat("EEEE, MMMM dd, yyyy") instead of SimpleDateFormat to = new SimpleDateFormat("dd/MM/yyyy");

It resolve your Unparseable date issue.

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Try to use something like this:

public static String dateToString(String date){
    if(date.equals("")) return "";
    if(date == null || date.length() == 0){
        return "";
    }
    SimpleDateFormat formatIn = new SimpleDateFormat("dd/MM/yyyy");
    SimpleDateFormat formatOut = new SimpleDateFormat("yyyy-dd-MM");

    try {
        Date l_date =  formatIn.parse(date);
        String result = formatOut.format(l_date);
        return result;
    } catch (ParseException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        return "";
    }
}

but if you want to put some data into database you may also use instead String java.sql.Date

something like this:

SimpleDateFormat format = new SimpleDateFormat();

Connection conn = ...
PreparedStatement ps = conn.prepareStatement("...");

long lDate = format.parse(sDate).getTime();
java.sql.Date dDate = new java.sql.Date(lDate);
ps.setDate(1, dDate);

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