How to Calculate the Date Difference in Days in Android/Java?

Finding Date Difference in Days: Android/Java Approach

You have the current date in the format mm/dd/yyyy and another date in the format yyyy/mm/dd. To calculate the difference between these dates in days, consider the following steps:

// Calculate the difference in milliseconds
long diff = today.getTimeInMillis() - thatDay.getTimeInMillis();

// Convert the difference to days
long days = diff / (24 * 60 * 60 * 1000);

Parsing the Date from a String

To parse the date from the string "yyyy/mm/dd" into a Calendar object, you can use the SimpleDateFormat class:

SimpleDateFormat formatter = new SimpleDateFormat("yyyy/MM/dd");
Date d = null;
try {
    d = formatter.parse(strThatDay); // catch exception
} catch (ParseException e) {
    e.printStackTrace();
}

Calendar thatDay = Calendar.getInstance();
thatDay.setTime(d);

Alternative Method

Since you know the date format, you could also use Integer.parseInt() on its substrings to get their numeric values and perform the calculations directly.

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