How to compare to String Date Formats in java?

Question

I am getting input as two types.

1.String date1 = \"07/01/2017\";
2.String date2 = \"\"2017-01-12 00:00:00.0\";

How to compare two date formats

Answer 1

Use RegEx:

    String date1 = "07/01/2017";
    if (date1.matches("^([0-9]{1,2}/){2}[0-9]{2,4}$")) {
        System.out.println("Date in MM/dd/yyyy format");
    } else if (date1.matches("^[0-9]{2,4}(-[0-9]{1,2}){2}\\s[0-9]{1,2}(:[0-9]{1,2}){2}\\.[0-9]{1,}$")) {
        System.out.println("Date in yyyy-MM-dd hh:mm:ss.t format");
    } else {
        System.err.println("Unsupported Date format.");
    }