How many days does Android compute differ

Public static void main (String[] args)  {datediff ("2015-04-01 17:06:49",  " 2015-04-02 17:06:50 "," Yyyy-mm-dd hh:mm:ss ");} Public static void datediff (string starttime, string endtime, string  Format)  {//  generate a Simpledateformate object in the incoming format simpledateformat sd = new  SimpleDateFormat (format);long nd = 1000 * 24 * 60 * 60;//  The number of milliseconds in a day long nh = 1000 * 60 * 60;//  the number of milliseconds in an hour long nm = 1000  * 60;//  the number of milliseconds in a minute long ns = 1000;//  milliseconds in a second long diff;try {//  Get a millisecond time difference of two time try {long diff = sd.parse (EndTime). GetTime ()- sd.parse (startTime). GetTime ();long day = diff / nd;//  Calculate the difference in how many days long hour = diff %  nd / nh;//  How many hours to calculate the difference long min = diff % nd % nh / nm;//  Calculate the difference in how many minutes long sec = diff % nd % nh %  nm / ns;//  calculate the difference in seconds//output result System.out.println ("Time difference:"  + day +  "Day"  +  hour +  "Hours"  + min +  "minutes" + sec +  "seconds. ");}  catch  (parseexception e)  {// TODO Auto-generated catch  Blocke.printstacktrace ();}}

How many days does Android compute differ