Date commitDate=new SimpleDateFormat("MM/yyyy").parse(commitDateString);
                    Date firstCommit=new SimpleDateFormat("MM/yyyy").parse(startDate);
                    Date lastCommit = new SimpleDateFormat("MM/yyyy").parse(endDate);

                    calFirstCommit.setTime(firstCommit);
                    calLastCommit.setTime(lastCommit);
                    calCommit.setTime(commitDate);

                    int monthsDiff = 12*(calLastCommit.get(Calendar.YEAR)-calFirstCommit.get(Calendar.YEAR)) + (calLastCommit.get(Calendar.MONTH) - calFirstCommit.get(Calendar.MONTH));
                    calFirstCommit.add(Calendar.MONTH, (monthsDiff/2) - 1);
                    calLastCommit.setTime(firstCommit);
                    calLastCommit.add(Calendar.MONTH,  (monthsDiff/2));