Calculate with date in Android

Question

Does anyone here know what the best way is to calculate the date 2 days in the past?

I've got this piece of code to retrieve the current date:

public static String getDateTime (String Format){
    SimpleDateFormat sdf = new SimpleDateFormat(Format);
    return sdf.format(new Date());
}

But I want to be able to calculate the date 2 days in the past. So decrease the date with 2 days. Anyone who knows what the best way is to do this?

Thanks in advance

Check this out: http://stackoverflow.com/a/4902702/833647 – Ken Wolf Jun 20 '13 at 10:05 — Ken Wolf, Jun 20 '13 at 10:05

score 3 · Accepted Answer · answered Jun 20 '13 at 10:05

Using Calendar is probably the easiest way. Assuming that you have defined Format as per the question:

// get Now
Calendar cal = Calendar.getInstance();

// go back two days
cal.add(Calendar.DAY_OF_YEAR, -2);

// display
SimpleDateFormat sdf = new SimpleDateFormat(Format);
String string = sdf.format(cal.getTime());

score 0 · Answer 2 · answered Jun 20 '13 at 10:05

0

Just use Calendar's add() function:

Calendar c = Calendar.getInstance();
c.setTime(yourDateObject);
c.add(Calendar.DAY_OF_MONTH, -2);

It will automatically change the month, year, etc. if necessary.

answered Jun 20 '13 at 10:05

Christophe Longeanie

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Calculate with date in Android

2 Answers2