LocalDateTime converters for room database

Converters.kt

import androidx.room.TypeConverter
import java.time.Instant
import java.time.LocalDateTime
import java.time.ZoneId
import java.time.ZoneOffset

class Converters {
    @TypeConverter
    fun fromLocalDatetime(value: LocalDateTime?): Long? {
        return value?.atZone(ZoneId.of(ZoneOffset.systemDefault().id))?.toInstant()?.toEpochMilli()
    }

    @TypeConverter
    fun toLocalDateTime(value: Long?): LocalDateTime? {
        return value?.let {
            Instant.ofEpochMilli(it).atZone(ZoneId.systemDefault()).toLocalDateTime()
        }
    }
}