Description

JanecekPetr

opened on Mar 31, 2026

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Expected behavior

This is very similar to:

• Mapping LocalDate to LocalDateTime and reverse #3304
• Support for implicit conversion between java.time.LocalDate and java.time.LocalDateTime #3199
  ...which was implemented in 1.6, so I expected all time-related conversions to behave the same.

However, given:

record Zoned(ZonedDateTime zonedDateTime) {}
record Local(LocalDateTime localDateTime) {}

@Mapper
interface ZonedToLocalMapper {
    @Mapping(target = "localDateTime", source = "zonedDateTime")
    Local toLocal(Zoned zoned);
}

I'd expect the mapper to just do

localDateTime = zonedDateTime.toLocalDateTime();

The reverse fails nicely, that's correct as converting LocalDateTime to ZonedDateTime requires a Zone.

Actual behavior

however, we see this monstrosity

localDateTime = xmlGregorianCalendarToLocalDateTime( zonedDateTimeToXmlGregorianCalendar( zonedDateTime ) );

with a lot of javax.xml.datatype classes. Those should be unnecessary.

Steps to reproduce the problem

record Zoned(ZonedDateTime zonedDateTime) {}
record Local(LocalDateTime localDateTime) {}

@Mapper
interface ZonedToLocalMapper {
    @Mapping(target = "localDateTime", source = "zonedDateTime")
    Local toLocal(Zoned zoned);
}

and the sane for OffsetDateTime on the left side and likely Instant and LocalTime and LocalDate on the right side etc.

MapStruct Version

1.6.3

Reacted by Bernhard

Activity

1. JanecekPetr

   added

   bug

   on Mar 31, 2026
2. JanecekPetr commented on Mar 31, 2026

   

   JanecekPetr

   on Mar 31, 2026

   Author

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   Similarly, I now see that neither ZonedDateTime nor OffsetDateTime cannot be converted to Instant at all, even though zonedDateTime.toInstant() exists.
3. JanecekPetr

   changed the title [-]Mapping `ZonedDateTime` to `LocalDateTime`[/-] [+]Mapping `ZonedDateTime` or `OffsetDateTime` to `LocalDateTime`[/+] on Mar 31, 2026
4. Takch02 commented on Apr 5, 2026

   

   Takch02

   on Apr 5, 2026

   Contributor

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   @JanecekPetr hi, Can I work on?
5. filiphr commented on May 1, 2026

   

   filiphr

   on May 1, 2026

   Member

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   @Takch02 you are more than welcome to contribute this.

   @JanecekPetr thanks for raising this. This is a valid bug
6. filiphr

   added this to the 1.7.x milestone on May 1, 2026
7. Takch02 commented on May 1, 2026

   

   Takch02

   on May 1, 2026

   Contributor

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   @filiphr Thank you, I try it!
8. Takch02

   added a commit that references this issue on May 3, 2026

   mapstruct#4027 Add license Header

   f0279a9
9. Takch02

   added 3 commits that reference this issue on May 23, 2026

   mapstruct#4027 Add support for implicit conversion between ZonedDateT…

   7fe6088

   mapstruct#4027 Add support for conversion Instant/LocalDateTime, Inst…

   5fda707

   mapstruct#4027 Add documentation

   db58594
10. hduelme

    added a commit that references this issue on May 24, 2026

    #4027 Fix mapping ZonedDateTime or OffsetDateTime to LocalDateTime or…

    428fd27
11. hduelme

    closed this as completedin #4047on May 24, 2026

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