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Which date library can be used in compose-web projects? I'm using Jetbrains Exposed on my server, which supports Java8 date, Jodatime and Kotlinx, but none of them, it seems, are supported i wasm/js...

kotlinx-datetime supports wasmJS since 0.5.0. And how is wasmJS related to your server DB framework?

I'm storing entries with dates in a database, the wasm frontent app might create new entries for the database, while it can receive them without a problem, constructing one fails, because Kotlinx dates can't be found in wasm project...

You need to send the dates over the wire, eg with kotlinx serialization so the server db framework is unrelated. And what datetime version do you use?

```implementation("org.jetbrains.kotlinx:kotlinx-datetime:0.6.1")```


yet I can't construct instance of a class that contains `LocalDateTime` in wasmJS

With the above dependency declaration in commonMain I can do this without problem in common code and run it in a browser.
```val dateTime: LocalDateTime = Clock.System.now().toLocalDateTime(TimeZone.currentSystemDefault())```


With such dependencies in commonMain:

```    sourceSets {
        commonMain.dependencies {
            // put your Multiplatform dependencies here
            implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.7.2")
            implementation("org.jetbrains.kotlinx:kotlinx-datetime:0.6.1")
        }
        jvmMain {
            dependencies {
            }
        }
    }```
LocalDateTime, Clock and TimeZone are not available in composeApp for me.

I’d first go back to serialization 1.7.1 because there is currently a problem with 1.7.2. See: <https://github.com/Kotlin/kotlinx.serialization/issues/2810#issuecomment-2338008697>
I don’t know whether that’s related to your problem but at least it’s worth a try.