When storing data in SQLite databases it must conform to the accepted data types e.g. a date must be stored in TEXT, REAL or INTEGER format. Therefore we can specify code to convert a date from a timestamp to a Date object (and back), and Room will use these when reading or writing data. TypeConverters must be declared when Building A Database.
public class DateConverter {
@TypeConverter
public static Date toDate(Long timestamp) { // Room will use this when reading from the database
return timestamp == null ? null : new Date(timestamp);
}
@TypeConverter
public static Long toTimestamp(Date date) { { // Room will use this when writing to the database
return date == null ? null : date.getTime();
}
}