private String getLastUpdateTime() {

        if (mLastUpdateTime == -1 && !TextUtils.isEmpty(mLastUpdateTimeKey)) {
            mLastUpdateTime = getContext().getSharedPreferences(KEY_SharedPreferences, 0).getLong(mLastUpdateTimeKey, -1);
        }
        if (mLastUpdateTime == -1) {
            return null;
        }
        long diffTime = new Date().getTime() - mLastUpdateTime;
        int seconds = (int) (diffTime / 1000);
        if (diffTime < 0) {
            return null;
        }
        if (seconds <= 0) {
            return null;
        }
        StringBuilder sb = new StringBuilder();
        sb.append(getContext().getString(R.string.cube_ptr_last_update));

        if (seconds < 60) {
            sb.append(seconds + getContext().getString(R.string.cube_ptr_seconds_ago));
        } else {
            int minutes = (seconds / 60);
            if (minutes > 60) {
                int hours = minutes / 60;
                if (hours > 24) {
                    Date date = new Date(mLastUpdateTime);
                    sb.append(sDataFormat.format(date));
                } else {
                    sb.append(hours + getContext().getString(R.string.cube_ptr_hours_ago));
                }

            } else {
                sb.append(minutes + getContext().getString(R.string.cube_ptr_minutes_ago));
            }
        }
        return sb.toString();
    }
Using an object to specify the last update time.

@param object
ptr-lib/src/in/srain/cube/views/ptr/PtrClassicDefaultHeader.java