Java Date Utility methods: Getting past/future date from days

Date manipulation is required in everyday Java programming. Creating a date instance for a past or future date is required at many places where we are trying to have a date range.
The Java Utility method getDateBeforeDays() returns a java.util.Date instance with a date before number of days specified.

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/**
* This utility method returns a past date before number of days.
* @param days
* @return
*/
public static Date getDateBeforeDays(int days) {
long backDateMS = System.currentTimeMillis() - ((long)days) *24*60*60*1000;
Date backDate = new Date();
backDate.setTime(backDateMS);
return backDate;
}


The Java Utility method getDateAfterDays() returns a java.util.Date instance with a date after number of days specified.

/**
* This utility method returns a future date after number of days.
* @param days
* @return
*/
public static Date getDateAfterDays(int days) {
long backDateMS = System.currentTimeMillis() + ((long)days) *24*60*60*1000;
Date backDate = new Date();
backDate.setTime(backDateMS);
return backDate;
}    



You can keep these Utility methods as public static methods of a class say DateUtility and call it anywhere in your application using DateUtility.getDateAfterDays() or DateUtility.getDateBeforeDays().

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