number
Returns the number of days in the year-month.
Samples
import kotlinx.datetime.*
import kotlinx.datetime.format.*
import kotlinx.datetime.onDay
import kotlin.test.*
fun main() {
//sampleStart
// Determining the number of days in a year-month
check(YearMonth(2024, Month.FEBRUARY).numberOfDays == 29)
check(YearMonth(2023, Month.FEBRUARY).numberOfDays == 28)
check(YearMonth(2024, Month.APRIL).numberOfDays == 30)
//sampleEnd
}