Method which returns age of event

gistfile1.txt

/**
     * helpful method.
     *
     * Condition: '_date' must be GMT +0;
     *
     * Returns the time values that passed. (e.g. 4m ago, 18h ago, 5d ago...etc);
     */
    public static String getAgeOfMessage(String _date){
        String dateString = DateTimeConverter.getDate(_date) + " " + DateTimeConverter.getTimeWithoutOffset(_date);
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm");
        dateFormat.setLenient(false);
        Date createdDate = new Date();
        try {
            createdDate = dateFormat.parse(dateString);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        createdDate.setHours(createdDate.getHours() + getTimeOffset());

//        SimpleDateFormat outputDateFormat = new SimpleDateFormat("yyyy-MM-dd");
        long difference = System.currentTimeMillis() - createdDate.getTime();
        Calendar cal = Calendar.getInstance();
        cal.setTimeInMillis(difference);

        if(cal.get(Calendar.YEAR) - 1970 == 0){
            if(cal.get(Calendar.MONTH) == 0){
                if(cal.get(Calendar.DAY_OF_MONTH) - 1 == 0){
                    //the following line has hardcoded!
                    if(cal.get(Calendar.HOUR_OF_DAY) - getTimeOffset() - 1 == 0){
                        if (cal.get(Calendar.MINUTE) == 0){
                            return "right now";
                        } else {
                            if (cal.get(Calendar.MINUTE) == 1) {
                                return cal.get(Calendar.MINUTE) + " minute ago";
                            } else return cal.get(Calendar.MINUTE) + " minutes ago";
                        }
                    } else {
                        //the following line has hardcoded!
                        if (cal.get(Calendar.HOUR_OF_DAY) - getTimeOffset() - 1 == 1) {
                            //the following line has hardcoded!
                            return cal.get(Calendar.HOUR_OF_DAY) - getTimeOffset() - 1 + " hour ago";
                        } else return cal.get(Calendar.HOUR_OF_DAY) - getTimeOffset() - 1 + " hours ago";
                    }
                } else {
                    if (cal.get(Calendar.DAY_OF_MONTH) - 1 <= 7){
                        if (cal.get(Calendar.DAY_OF_MONTH) - 1 == 1) {
                            return cal.get(Calendar.DAY_OF_MONTH) - 1 + " day ago";
                        } else return cal.get(Calendar.DAY_OF_MONTH) - 1 + " days ago";
                    } else {
                        return DateTimeConverter.getDate(_date);
                    }
                }
            } else {
                return DateTimeConverter.getDate(_date);
            }
        } else {
            return DateTimeConverter.getDate(_date);
        }

    }