Today is nth day of year [duplicate]

by 
Calendar calendar = Calendar.getInstance();
int dayOfYear = calendar.get(Calendar.DAY_OF_YEAR);

Or using Joda-API 

DateTime dt = new DateTime();  
int dayOfYear = dt.getDayOfYear();

If you need 'th' part, use switch statement 

switch (dayOfYear > 20 ? (dayOfYear % 10) : dayOfYear) {
            case 1:  return dayOfYear + "st";
                     break;
            case 2:  return dayOfYear + "nd";
                     break;
            case 3:  return dayOfYear + "rd";
                     break;
            default:  return dayOfYear + "th";
                     break;   
}

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