Java tutorial
import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; public class Main { public static void main(String[] args) { Date today = new Date(); Calendar calendar = Calendar.getInstance(); calendar.setTime(today); calendar.add(Calendar.MONTH, 1); calendar.set(Calendar.DAY_OF_MONTH, 1); calendar.add(Calendar.DATE, -1); Date lastDayOfMonth = calendar.getTime(); DateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); System.out.println("Today : " + sdf.format(today)); System.out.println("Last Day of Month: " + sdf.format(lastDayOfMonth)); } }