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I am assuming Java has some built-in way to do this.
Given a date, how can I determine the date one day prior to that date?
For example, suppose I am given 3/1/2009. The previous date is 2/28/2009. If I had been given 3/1/2008, the previous date would have been 2/29/2008.
208
Use the setDate() method to get the previous day of a date, e.g. date. setDate(date. getDate() - 1) .
In Java, two dates can be compared using the compareTo() method of Comparable interface. This method returns '0' if both the dates are equal, it returns a value "greater than 0" if date1 is after date2 and it returns a value "less than 0" if date1 is before date2.
oneDayBefore = new Date(myDate. getTime() - 2); String result = dateFormat. format(oneDayBefore); To get the same results as those that are being computed by using Calendar.
DateTime yesterday = new DateTime(). minusDays(1);
Use the Calendar interface.
Calendar cal = Calendar.getInstance();
cal.setTime(myDate);
cal.add(Calendar.DAY_OF_YEAR,-1);
Date oneDayBefore= cal.getTime();
Doing "addition" in this way guarantees you get a valid date. This is valid for 1st of the year as well, e.g. if myDate is January 1st, 2012, oneDayBefore will be December 31st, 2011.
63
You can also use Joda-Time, a very good Java library to manipulate dates:
DateTime result = dt.minusDays(1);
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