Allow specifying custom DateTimeFormatter for OffsetDateTime ser/deser (new constructors?) (original) (raw)

Trying to make OffsetDateTime deserialize from ISO_LOCAL_DATE_TIME pattern by appending default offset of "0". This is easily doable with

    public static final DateTimeFormatter OFFSET_DATE_TIME_PARSER =
            new DateTimeFormatterBuilder()
                    .append(DateTimeFormatter.ISO_LOCAL_DATE_TIME)
                    .optionalStart()
                    .parseLenient()
                    .appendOffsetId()
                    .parseStrict()
                    .optionalEnd()
                    .parseDefaulting(ChronoField.OFFSET_SECONDS, 0)
                    .toFormatter();

        var parsed = OffsetDateTime.parse("2025-01-01T22:01:05", OFFSET_DATE_TIME_PARSER);

However, there is no easy way to override this parser, especially since InstantDeserializer.ISO_OFFSET_DATE_TIME is created with many parameters and calls methods that are private to the InstantDeserializer.

When looking at LocalDateTimeDeserializer it as a public constructor that accepts DateTimeFormatter as an arg.

Similar situation happens in OffsetDateTimeSerializer. I wish to only display 3 digits of nano-second instead of 9, but there's no right way to override DateTimeFormatter in OffsetDateTimeSerializer like there's in LocalDateTimeSerializer

Would you kindly support this use-case?