How can I convert a org.threeten.bp.OffsetDateTime to java.time.OffsetDateTime?

Question

I'm using a client library (third party, not mine, cannot change) which utilizes the ThreeTen date types. My project is Java 11 and uses Java 8 date types. What is the recommended way to convert ThreeTeen objects to their Java 8 counterparts?

Answer 1

There seems to be no built-in way to convert one instance to the other.

I think you have write your own converters, like one of the following:

Part-by-part conversion:

public static java.time.OffsetDateTime convertFrom(org.threeten.bp.OffsetDateTime ttOdt) {
    // convert the instance part by part...
    return java.time.OffsetDateTime.of(ttOdt.getYear(), ttOdt.getMonthValue(),
            ttOdt.getDayOfMonth(), ttOdt.getHour(), ttOdt.getMinute(),
            ttOdt.getSecond(), ttOdt.getNano(),
            // ZoneOffset isn't compatible, create one using the seconds of the given
            java.time.ZoneOffset.ofTotalSeconds(ttOdt.getOffset().getTotalSeconds());
}

Parsing the formatted output of the other instance:

public static java.time.OffsetDateTime convertFrom(org.threeten.bp.OffsetDateTime ttOdt) {
    // convert the instance by parsing the formatted output of the given instance
    return java.time.OffsetDateTime.parse(
            ttOdt.format(org.threeten.bp.format.DateTimeFormatter.ISO_OFFSET_DATE_TIME));
}

Haven't tested which one is more efficient...