Program: 3975
Project: 3975
Buggy source:
/** 
 * Converts the universal date time string to local date time.
 * @param dateString The value.
 * @return DateTime Returned date is always in UTC date.
 */
protected Date convertUniversalDateTimeStringToDate(String dateString){
  String localTimeRegex="String_Node_Str";
  Pattern localTimePattern=Pattern.compile(localTimeRegex);
  String timeRegex="String_Node_Str";
  Pattern timePattern=Pattern.compile(timeRegex);
  String utcPattern="String_Node_Str";
  String utcPattern1="String_Node_Str";
  String localPattern="String_Node_Str";
  String localPattern1="String_Node_Str";
  String pattern="String_Node_Str";
  String localPattern2="String_Node_Str";
  DateFormat utcFormatter=null;
  Date dt=null;
  String errMsg=String.format("String_Node_Str",dateString);
  if (dateString == null || dateString.isEmpty()) {
    return null;
  }
 else {
    if (dateString.endsWith("String_Node_Str")) {
      utcFormatter=new SimpleDateFormat(utcPattern);
      try {
        dt=utcFormatter.parse(dateString);
      }
 catch (      ParseException e) {
        utcFormatter=new SimpleDateFormat(pattern);
        try {
          dt=utcFormatter.parse(dateString);
        }
 catch (        ParseException e1) {
          utcFormatter=new SimpleDateFormat(localPattern1);
          try {
            dt=utcFormatter.parse(dateString);
          }
 catch (          ParseException ex) {
            utcFormatter=new SimpleDateFormat(utcPattern1);
          }
          try {
            dt=utcFormatter.parse(dateString);
          }
 catch (          ParseException e2) {
            throw new IllegalArgumentException(errMsg,e);
          }
        }
      }
    }
 else     if (dateString.endsWith("String_Node_Str")) {
      utcFormatter=new SimpleDateFormat("String_Node_Str");
      try {
        dt=utcFormatter.parse(dateString);
      }
 catch (      ParseException e) {
        throw new IllegalArgumentException(e);
      }
    }
 else {
      Matcher localTimeMatcher=localTimePattern.matcher(dateString);
      if (localTimeMatcher.find()) {
        System.out.println("String_Node_Str");
        String date=localTimeMatcher.group(1);
        String zone=localTimeMatcher.group(2);
        dateString=String.format("String_Node_Str",date,zone);
        try {
          utcFormatter=new SimpleDateFormat(localPattern);
          dt=utcFormatter.parse(dateString);
        }
 catch (        ParseException e) {
          try {
            utcFormatter=new SimpleDateFormat(pattern);
            dt=utcFormatter.parse(dateString);
          }
 catch (          ParseException ex) {
            throw new IllegalArgumentException(ex);
          }
        }
      }
 else {
        utcFormatter=new SimpleDateFormat(localPattern2);
        try {
          dt=utcFormatter.parse(dateString);
        }
 catch (        ParseException e) {
          e.printStackTrace();
          throw new IllegalArgumentException(errMsg);
        }
      }
    }
    return dt;
  }
}

Fixed version (ground truth):
/** 
 * Converts the universal date time string to local date time.
 * @param dateString The value.
 * @return DateTime Returned date is always in UTC date.
 */
protected Date convertUniversalDateTimeStringToDate(String dateString){
  String localTimeRegex="String_Node_Str";
  Pattern localTimePattern=Pattern.compile(localTimeRegex);
  String timeRegex="String_Node_Str";
  Pattern timePattern=Pattern.compile(timeRegex);
  String utcPattern="String_Node_Str";
  String utcPattern1="String_Node_Str";
  String localPattern="String_Node_Str";
  String localPattern1="String_Node_Str";
  String pattern="String_Node_Str";
  String localPattern2="String_Node_Str";
  DateFormat utcFormatter=null;
  Date dt=null;
  String errMsg=String.format("String_Node_Str",dateString);
  if (dateString == null || dateString.isEmpty()) {
    return null;
  }
 else {
    if (dateString.endsWith("String_Node_Str")) {
      utcFormatter=new SimpleDateFormat(utcPattern);
      utcFormatter.setTimeZone(TimeZone.getTimeZone("String_Node_Str"));
      try {
        dt=utcFormatter.parse(dateString);
      }
 catch (      ParseException e) {
        utcFormatter=new SimpleDateFormat(pattern);
        utcFormatter.setTimeZone(TimeZone.getTimeZone("String_Node_Str"));
        try {
          dt=utcFormatter.parse(dateString);
        }
 catch (        ParseException e1) {
          utcFormatter=new SimpleDateFormat(localPattern1);
          utcFormatter.setTimeZone(TimeZone.getTimeZone("String_Node_Str"));
          try {
            dt=utcFormatter.parse(dateString);
          }
 catch (          ParseException ex) {
            utcFormatter=new SimpleDateFormat(utcPattern1);
            utcFormatter.setTimeZone(TimeZone.getTimeZone("String_Node_Str"));
          }
          try {
            dt=utcFormatter.parse(dateString);
          }
 catch (          ParseException e2) {
            throw new IllegalArgumentException(errMsg,e);
          }
        }
      }
    }
 else     if (dateString.endsWith("String_Node_Str")) {
      utcFormatter=new SimpleDateFormat("String_Node_Str");
      utcFormatter.setTimeZone(TimeZone.getTimeZone("String_Node_Str"));
      try {
        dt=utcFormatter.parse(dateString);
      }
 catch (      ParseException e) {
        throw new IllegalArgumentException(e);
      }
    }
 else {
      Matcher localTimeMatcher=localTimePattern.matcher(dateString);
      if (localTimeMatcher.find()) {
        System.out.println("String_Node_Str");
        String date=localTimeMatcher.group(1);
        String zone=localTimeMatcher.group(2);
        dateString=String.format("String_Node_Str",date,zone);
        try {
          utcFormatter=new SimpleDateFormat(localPattern);
          utcFormatter.setTimeZone(TimeZone.getTimeZone("String_Node_Str"));
          dt=utcFormatter.parse(dateString);
        }
 catch (        ParseException e) {
          try {
            utcFormatter=new SimpleDateFormat(pattern);
            utcFormatter.setTimeZone(TimeZone.getTimeZone("String_Node_Str"));
            dt=utcFormatter.parse(dateString);
          }
 catch (          ParseException ex) {
            throw new IllegalArgumentException(ex);
          }
        }
      }
 else {
        utcFormatter=new SimpleDateFormat(localPattern2);
        utcFormatter.setTimeZone(TimeZone.getTimeZone("String_Node_Str"));
        try {
          dt=utcFormatter.parse(dateString);
        }
 catch (        ParseException e) {
          e.printStackTrace();
          throw new IllegalArgumentException(errMsg);
        }
      }
    }
    return dt;
  }
}