saving date type in room database
public class TimestampConverter {
    static DateFormat df = new SimpleDateFormat(Constants.TIME_STAMP_FORMAT);
    @TypeConverter
    public static Date fromTimestamp(String value) {
        if (value != null) {
            try {
                return df.parse(value);
            } catch (ParseException e) {
                e.printStackTrace();
            }
            return null;
        } else {
            return null;
        }
    }
