Convert month string to integer in java

Question

Given a month string such as:

    "Feb"
or
    "February"

Is there any core java or third party library functionality that would allow you to convert this string to the corresponding month number in a locale agnostic way?

Answer 1

SimpleDateFormat.parse.

Answer 2

You could parse the month using SimpleDateFormat:

    Date date = new SimpleDateFormat("MMM", Locale.ENGLISH).parse("Feb");
    Calendar cal = Calendar.getInstance();
    cal.setTime(date);
    int month = cal.get(Calendar.MONTH);
    System.out.println(month == Calendar.FEBRUARY);

Be careful comparing int month to an int (it does not equal 2!). Safest is to compare them using Calendar's static fields (like Calendar.FEBRUARY).

Answer 3

An alternative to SimpleDateFormat using Joda time:

    import org.joda.time.DateTime;
    import org.joda.time.format.DateTimeFormat;
    import org.joda.time.format.DateTimeFormatter;
    ...

    // if default locale is ok simply omit '.withLocale(...)'
    DateTimeFormatter format = DateTimeFormat.forPattern("MMM");
    DateTime instance        = format.withLocale(Locale.FRENCH).parseDateTime("août");  

    int month_number         = instance.getMonthOfYear();
    String month_text        = instance.monthOfYear().getAsText(Locale.ENGLISH);

    System.out.println( "Month Number: " + month_number );
    System.out.println( "Month Text:   " + month_text   );

    OUTPUT:
        Month Number: 8
        Month Text:   August