What is the best way to increment a Java.sql.date / time?

Question

I have an issue where I have a MySQL database storing dates and times in separate columns. However, in Java code I need to increment the resulting timestamp for a date and t

Answer 1

You can use Joda time. Then, you can use DateTime's plusHours, plusDays, and plusWeeks. For parsing, there is DateTimeFormat and DateTimeFormatter. Something like:

DateTimeFormatter fmt = DateTimeFormat.forPattern("YYYY-MM-dd HH:mm:ss");
DateTime dt = fmt.parseDateTime(timestampin);

if (increment.equals("HOURLY")) {
    dt = dt.plusHours(1);
}
else if (increment.equals("DAILY")) {
    dt = dt.plusDays(1);
}
else  if (increment.equals("WEEKLY")) {
    dt = dt.plusWeeks(1);
}

String timestampOut = fmt.print(dt);

You can probably use something like:

DateTime dt = new DateMidnight(sqlDate).plus(Period.millis(sqlTime.getTime()));

That assumes the sql.Time represents the number of milliseconds since midnight.