java - Geting duration of 2 times -


how can duration of 2 strings in format yyyymmddthhmmss?

i´m trying using calendar class , checking gettimeinmillis(). problem having is not consistent. idea doing wrong? every time run program 40-70 lines of output console when should none.

public class durationtester {      /**      * duration between 2 given times      * @param time1 yyyymmddthhmmss      * @param time2 yyyymmddthhmmss      * @return minutes between time1 , time2      */     public static int getduration(string time1, string time2){         int yyyy1 = integer.parseint(time1.substring(0,4));         int mm1 = integer.parseint(time1.substring(4,6));         int dd1 = integer.parseint(time1.substring(6,8));         int hh1 = integer.parseint(time1.substring(9,11));         int min1 = integer.parseint(time1.substring(11,13));          int yyyy2 = integer.parseint(time2.substring(0,4));         int mm2 = integer.parseint(time2.substring(4,6));         int dd2 = integer.parseint(time2.substring(6,8));         int hh2 = integer.parseint(time2.substring(9,11));         int min2 = integer.parseint(time2.substring(11,13));          calendar cal1 = calendar.getinstance();         cal1.set(yyyy1, mm1, dd1, hh1, min1, 0);         calendar cal2 = calendar.getinstance();         cal2.set(yyyy2, mm2, dd2, hh2, min2, 0);         long millisec = cal1.gettimeinmillis()-cal2.gettimeinmillis();         long nonnegativems = math.abs(millisec);         long seconds = nonnegativems / 1000;         long minutes = seconds / 60;                 return (int)minutes;     }      public static void main(string[] args){         string t1 = "20130108t150000";         string t2 = "20130108t131500";          int errors = 0;         for(int i=0; i<5000; i++){             int duration = getduration(t1,t2);             if(duration == 104){                 system.out.println("error: should 105 ("+errors++ +")");             }         }     } }

that's documented bug.

try clearing calendar before set:

cal1.clear(); cal1.set(yyyy1, mm1, dd1, hh1, min1, 0);  cal2.clear(); cal2.set(yyyy2, mm2, dd2, hh2, min2, 0);

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