package com.as400samplecode; import java.text.DateFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; public class DateCalculations { public static void main(String[] args) { String myInputDate = "20120607"; String myFutureDate = addDays(myInputDate, "30"); System.out.println(myFutureDate); String myPastDate = subtractDays(myInputDate, "30"); System.out.println(myPastDate); } private static String addDays(String fromDate, String days) { Calendar c = Calendar.getInstance(); DateFormat df = new SimpleDateFormat("yyyyMMdd"); try { Date myDate = df.parse(fromDate.trim()); c.setTime(myDate); c.add(Calendar.DATE, Integer.parseInt(days)); } catch (ParseException e) { e.printStackTrace(); } String toDate = df.format(c.getTime()); return toDate; } private static String subtractDays(String fromDate, String days) { Calendar c = Calendar.getInstance(); DateFormat df = new SimpleDateFormat("yyyyMMdd"); try { Date myDate = df.parse(fromDate.trim()); c.setTime(myDate); c.add(Calendar.DATE, (Integer.parseInt(days)*-1)); } catch (ParseException e) { e.printStackTrace(); } String toDate = df.format(c.getTime()); return toDate; } }
All one can think and do in a short time is to think what one already knows and to do as one has always done!
Java Date Calculation example - Add and Subtract days
Its very easy with the help of Calendar.add() method. First get the Calendar instance for your given date and then use the add method. For date subtraction just use a negative number in the parameter. Here is a sample code ...
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