how can i get previous date?

[prasant sahoo]

Hi,
I am entering a future date,lets say(20-08-2008) through my application.I need to perform some actions on the previous date(19-08-2008) of the entered date(20-08-2008).How can i get that previous date? please help..

[Rameshwar Kharat]

Try GregorianCalendar
http://www.developer.com/java/article.php/732511
when dealing with the Dates

eg.
code to get yesterday's date using gregorian Calendar

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
GregorianCalendar today = new GregorianCalendar();
GregorianCalendar yesterday = new GregorianCalendar();
yesterday.add(Calendar.DATE, -1);
String yesDate = new String(yesterday.toString());
System.out.println(yesDate);

Hope this will help you .

[Rob Spoor]

I'd use Calendar.getInstance() instead of GregorianCalendar. That way you always get the calendar system of the local system; for some countries it may be different.

DateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); // declare as DateFormat
Calendar today = Calendar.getInstance();
Calendar yesterday = Calendar.getInstance();
yesterday.add(Calendar.DATE, -1);
Date d = yesterday.getTime(); // get a Date object
String yesDate = sdf.format(d); // toString for Calendars is mostly not really useful
System.out.println(yesDate);

You can create a Calendar object for a specific date quite easily too:

DateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date d = sdf.parse("2008-05-05");
Calendar someday = Calendar.getInstance();
someday.setTime(d);