Find the day of week for any date given after 1751 in Kotlin

DayOfWeekCalculator.kt

package sample

import java.time.DayOfWeek.*
import java.time.LocalDate

class DayOfWeekCalculator

fun main() {
    val date = LocalDate.now()
    println("The day of week is ${calculateDayOfWeek(date)} for $date")
}

fun calculateDayOfWeek(date: LocalDate): String {
    // 1. Take the last two digits of the year.
    val step1: Int = date.year.toString().substring(2).toInt()

    // 2. Divide it by 4 and discard any remainder.
    val step2: Int = step1 / 4

    //3. Add the day of the month to the value obtained in the previous step.
    val step3: Int = step2 + date.dayOfMonth

    // 4. Add the month code to the value obtained in the previous step.
    val step4: Int = step3 + MonthCode.codeFor(date.month.value)

    // 5. If the date is in Jan or Feb of a leap year; subtract 1 from the previous step.
    val step5: Int = if (date.isLeapYear && listOf(1, 2).contains(date.month.value)) step4 - 1 else step4

    // 6. Add the century code to the value from the previous step.
    val step6: Int = step5 + CenturyCode.codeFor(date.year.toString().substring(0, 2).toInt())

    // 7. Add the last two digits of the year to the value from the previous step.
    val step7: Int = step6 + date.year.toString().substring(2).toInt()

    // 8. Divide the value by 7 and take the remainder.
    val step8: Int = step7 % 7

    // 9. Find the day of the week that corresponds to the remainder obtained in the previous step.
    return DayOfWeek.dayFor(step8)
}

enum class MonthCode(
    val month: Int,
    val code: Int,
) {
    JAN(1, 1),
    FEB(2, 4),
    MAR(3, 4),
    APR(4, 0),
    MAY(5, 2),
    JUN(6, 5),
    JULY(7, 0),
    AUG(8, 3),
    SEPT(9, 6),
    OCT(10, 1),
    NOV(11, 4),
    DEC(12, 6);

    companion object {
        fun codeFor(mo: Int): Int {
            values().find { it.month == mo }.also { return it?.code ?: -1 }
        }
    }
}

enum class CenturyCode(
    val century: Int,
    val code: Int,
) {
    EIGHTEENTH(17, 4),
    NINETEENTH(18, 2),
    TWENTIETH(19, 0),
    TWNETYFIRST(20, 6);

    companion object {
        fun codeFor(cent: Int): Int {
            CenturyCode.values().find { it.century == cent }.also { return it?.code ?: -1 }
        }
    }
}

enum class DayOfWeek(
    val day: String,
    val code: Int,
) {
    SAT(SATURDAY.name, 0),
    SUN(SUNDAY.name, 1),
    MON(MONDAY.name, 2),
    TUE(TUESDAY.name, 3),
    WED(WEDNESDAY.name, 4),
    THUR(THURSDAY.name, 5),
    FRI(FRIDAY.name, 6);

    companion object {
        fun dayFor(cd: Int): String {
            DayOfWeek.values().find { it.code == cd }.also { return it?.day ?: "Funday" }
        }
    }
}