Java-How to calculate accurate time difference while using Joda Time Jar

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Using Joda formatter (non AM/PM) 

  final String dateStart = "01/14/2012 09:29:58";
  final String dateStop = "01/15/2012 10:31:48";
  final DateTimeFormatter format = DateTimeFormat.forPattern("MM/dd/yyyy HH:mm:ss");
  final DateTime dt1 = format.parseDateTime(dateStart);
  final DateTime dt2 = format.parseDateTime(dateStop);

  System.out.print(Days.daysBetween(dt1, dt2).getDays() + " days, ");
  System.out.print(Hours.hoursBetween(dt1, dt2).getHours() % 24 + " hours, ");
  System.out.print(Minutes.minutesBetween(dt1, dt2).getMinutes() % 60 + " minutes, ");
  System.out.print(Seconds.secondsBetween(dt1, dt2).getSeconds() % 60 + " seconds.");

Using Joda formatter (with AM/PM) 

  final String dateStart = "01/14/2012 09:29:58 AM";
  final String dateStop = "01/15/2012 10:31:48 PM";
  final DateTimeFormatter format = DateTimeFormat.forPattern("MM/dd/yyyy hh:mm:ss a");
  final DateTime dt1 = format.parseDateTime(dateStart);
  final DateTime dt2 = format.parseDateTime(dateStop);

  System.out.print(Days.daysBetween(dt1, dt2).getDays() + " days, ");
  System.out.print(Hours.hoursBetween(dt1, dt2).getHours() % 24 + " hours, ");
  System.out.print(Minutes.minutesBetween(dt1, dt2).getMinutes() % 60 + " minutes, ");
  System.out.print(Seconds.secondsBetween(dt1, dt2).getSeconds() % 60 + " seconds.");

Calculate units between with Period 

  final Period period = new Period(dt1, dt2);
  System.out.print(period.getDays() + " days, ");
  System.out.print(period.getHours() + " hours, ");
  System.out.print(period.getMinutes() + " minutes, ");
  System.out.print(period.getSeconds() + " seconds.");

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