Hey, I have a timestamp like this `2025-09-02T10:5...

# getting-started

[Hildebrandt Tobias]

Hey, I have a timestamp like this 2025-09-02T10:59:38+02:00 and at one point (envelope) I deserialize it as Instant with no problem.
At another point (payload) I want to do the same but it doesn't work. I looked at the imports but both import kotlinx.datetime.Instant .
But one does so from org.jetbrains.kotlinx:kotlinx-datetime and the other from org.jetbrains.kotlinx:kotlinx-datetime-jvm , with the latter not working.
The only dependency I have in both my common and jvmBackend modules is org.jetbrains.kotlinx:kotlinx-datetime so I guess it selects which one to use by itself.

What would be the best course of action to remedy this Problem?

Edit: Seems like I have to use Instant.parse() , before I had the json serializer do it, since most payloads are json and a select few are plain strings, but before I had no problems
just using the json parser for that and it allowed me to have a more generic approach for all messages.

[Klitos Kyriacou]

What do you mean by "it doesn't work"?

[Hildebrandt Tobias]

Hey, my edit overlapped with your comment.
I got it working, see the edit above.
I don't have the log anymore, but it was something along the lines of "expected t got T at 13, expected - got 2 at 0".
Which is weird because for the envelope I am still using the json parser.

[Hildebrandt Tobias]

For clarification, what I originally tried was:

data class MyEnvelope(
  val timestamp: Instant
}

json.deserialize<MyEnvelope>(message)

with message being

{
  timestamp: "2025-09-02T10:59:38+02:00"
}

Which worked.
But

json.deserialize<Instant>(message)

with message

2025-09-02T10:59:38+02:00

doesn't work.

[Klitos Kyriacou]

Which JSON deserializer are you using? Most of them have a problem deserializing kotlinx.datetime.Instant from an ISO string, because Instant is a inline value class, and so the function sees it as just a Long.