Passing a value from a function to another Kotlin class?

Question

Kotlin

Initially, the calendar shows a random date. It is necessary to implement the printing of the current date: select it and print the day, month and year, separated by a space.

class Calendar(var day: String, var month: String, var year: String) {
    fun selectCurrentDay() {
        day = "13"
        month = "03"
        year = "2021"
    }
}

fun createCalendar() =
    Calendar("13", "03", "2021")

fun main() {
    val calendar = createCalendar()

}