Increment a day in Java or get previous date

1. Using java.util.Calendar in typical Java application

SimpleDateFormat dateFormat = new SimpleDateFormat( "yyyy-MM-dd" );
Calendar cal = Calendar.getInstance();
cal.setTime( dateFormat.parse( inputString ) );
cal.add( Calendar.DATE, 1 );

2. Using java.util.Date - this does't take care Daylight saving but might be required for certain use cases and especially in GWT where Calendar is not supported.

Date date = new Date(); 
Date daysAgo = new Date(date.getTime() - (1000*60*60*24)); 

3. Using 3rd party library. For example, http://joda-time.sourceforge.net

Date date = new Date(); // Or where ever you get it from
Date daysAgo = new DateTime(date).minusDays(300).toDate();