Kotlin `LocalDate` extension functions to shift to a particular weekday, and US Holidays

LocalDateExt.kt

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

fun LocalDate.lastDayOfWeek(dow: DayOfWeek): LocalDate {
    val minus = (this.dayOfWeek.value + 7 - dow.value) % 7
    return this.minusDays(minus.toLong())
}

fun LocalDate.firstDayOfWeek(dow: DayOfWeek): LocalDate {
    val plus = (dow.value + 7 - this.dayOfWeek.value) % 7
    return this.plusDays(plus.toLong())
}

fun LocalDate.secondDayOfWeek(dow: DayOfWeek): LocalDate {
    return this.firstDayOfWeek(dow).plusDays(7)
}

fun LocalDate.thirdDayOfWeek(dow: DayOfWeek): LocalDate {
    return this.firstDayOfWeek(dow).plusDays(14)
}

fun LocalDate.fourthDayOfWeek(dow: DayOfWeek): LocalDate {
    return this.firstDayOfWeek(dow).plusDays(21)
}

UnitedStatesFederalHolidays.kt

import firstDayOfWeek
import fourthDayOfWeek
import lastDayOfWeek
import secondDayOfWeek
import thirdDayOfWeek
import java.time.DayOfWeek
import java.time.LocalDate

object UnitedStatesFederalHolidays {

    fun newYearsDay(year: Int) = LocalDate.of(year, 1, 1)
    fun martinLutherKingJrBirthday(year: Int) = LocalDate.of(year, 1, 1).thirdDayOfWeek(DayOfWeek.MONDAY)
    fun washingtonBirthday(year: Int) = LocalDate.of(year, 2, 1).thirdDayOfWeek(DayOfWeek.MONDAY)
    fun memorialDay(year: Int) = LocalDate.of(year, 5, 31).lastDayOfWeek(DayOfWeek.MONDAY)
    fun juneteenthDay(year: Int) = LocalDate.of(year, 6, 19)
    fun independenceDay(year: Int) = LocalDate.of(year, 7, 4)
    fun laborDay(year: Int) = LocalDate.of(year, 9, 1).firstDayOfWeek(DayOfWeek.MONDAY)
    fun columbusDay(year: Int) = LocalDate.of(year, 10, 1).secondDayOfWeek(DayOfWeek.MONDAY)
    fun veteransDay(year: Int) = LocalDate.of(year, 11, 11)
    fun thanksgivingDay(year: Int) = LocalDate.of(year, 11, 1).fourthDayOfWeek(DayOfWeek.THURSDAY)
    fun christmasDay(year: Int) = LocalDate.of(year, 12, 25)

}