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The Firebase Kotlin SDK is a Kotlin-first SDK for Firebase. It's API is similar to the Firebase Android SDK Kotlin Extensions but also supports multiplatform projects, enabling you to use Firebase directly from your common source targeting iOS, Android or JS.

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package dev.gitlive.firebase.firestore

import cocoapods.FirebaseFirestoreInternal.FIRTimestamp
import kotlinx.serialization.Serializable

/** A class representing a platform specific Firebase Timestamp. */
actual typealias NativeTimestamp = FIRTimestamp

/** A base class that could be used to combine [Timestamp] and [Timestamp.ServerTimestamp] in the same field. */
@Serializable(with = BaseTimestampSerializer::class)
actual sealed class BaseTimestamp

/** A class representing a Firebase Timestamp. */
@Serializable(with = TimestampSerializer::class)
actual class Timestamp internal actual constructor(
    internal actual val nativeValue: NativeTimestamp
): BaseTimestamp() {
    actual constructor(seconds: Long, nanoseconds: Int) : this(NativeTimestamp(seconds, nanoseconds))

    actual val seconds: Long = nativeValue.seconds
    actual val nanoseconds: Int = nativeValue.nanoseconds

    override fun equals(other: Any?): Boolean =
        this === other || other is Timestamp && nativeValue == other.nativeValue
    override fun hashCode(): Int = nativeValue.hashCode()
    override fun toString(): String = nativeValue.toString()

    actual companion object {
        actual fun now(): Timestamp = Timestamp(NativeTimestamp.timestamp())
    }

    /** A server time timestamp. */
    @Serializable(with = ServerTimestampSerializer::class)
    actual object ServerTimestamp: BaseTimestamp()
}