Question: how to calculate time difference between two dates java?
Answer: Date dateObj2 = sdf. parse(date2 + " " + time2); ... 
System. ... 
DecimalFormat crunchifyFormatter = new DecimalFormat("###,###");
// getTime() returns the number of milliseconds since January 1, 1970, 00:00:00 GMT represented by this Date object. ... 
int diffDays = (int) (diff / (24 * 60 * 60 * 1000));