number
The number of the Month. January is 1, December is 12.
Samples
import kotlinx.datetime.*
import kotlin.test.*
fun main() {
//sampleStart
// Getting the number of a month
check(Month.JANUARY.number == 1)
check(Month.FEBRUARY.number == 2)
// ...
check(Month.DECEMBER.number == 12)
//sampleEnd
}