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Hello guys, I putting my fingers in Jupyter-kotlin, and I take fun ! But I didn’t found any way to parse Date ? Is there any lib that may help me to deal with ? I need to calculate the time between  2 dates !

Hello! You may have even more fun with <https://github.com/Kotlin/kotlinx-datetime>

This is not supported by Jupyter, is it ?

Any library is supported by Kotlin Jupyter. For some of them there’re shortcuts like `%use multik`  but for others you may just import jar pointing out maven coordinates directly
`@file:DependsOn("org.jetbrains.kotlinx:kotlinx-datetime:0.3.1")`

This exact library won't work with jupyter kernel: its JAR doesn't contain class files, it contains `kotlin_metadata`  files instead:

Need to investigate it better. `kotlinx.serialization` works fine even being multiplatform

Well, this will work fine:
```@file:DependsOn("org.jetbrains.kotlinx:kotlinx-datetime-jvm:0.3.1")
import kotlinx.datetime.*```
The problem is that we use Maven resolver that takes only POM files into consideration. In this library, information about library variants is located in Gradle metadata file.

Update: they even mention this in the usage instruction
<https://github.com/Kotlin/kotlinx-datetime#maven>

Jupyter uses maven resolver, it does not recognize Gradle metadata. So you need to add platform prefixes for mpp.

Are there any plans to use a gradle resolver?  Or add support for gradle metadata somehow

I do not think -jvm suffix worth it. It should possible to do that in the notebook itself (automatically add suffix). But it is easy to add it manually.

No, there are no such plans for now, we are not going to provide a full-fledged build system inside Kotlin scripts. It turned out that even supporting Maven resolver which is rather minimalistic may cause problems in its maintenance

By the way, in this particular case, kotlinx-datetime is not needed since it is built on top of java.time and java.time is available out of the box.

Coming back to the original question: You could use JDK APIs to do so <https://www.baeldung.com/java-date-difference>