Hello guys, I putting my fingers in Jupyter-kotlin, and I take fun ! But I didn’t found any way to p...

# datascience

[Anthony f]

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 !

[roman.belov]

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

[Anthony f]

This is not supported by Jupyter, is it ?

[Anthony f]

@roman.belov

[roman.belov]

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")

[Ilya Muradyan]

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

[Ilya Muradyan]

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

[Ilya Muradyan]

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

[altavir]

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

[rnett]

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

[altavir]

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.

[Ilya Muradyan]

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

[altavir]

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.

[holgerbrandl]

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