Remaining Days With Joda Time When Calculating Months

Question

I have the following code snippet that calculates the months between two dates:

import com.github.nscala_time.time.Imports._
import org.joda.time.{DateTime, Days, Interval, Weeks, Months}
import scala.math.Integral.Implicits._

val days = 10
val start = new DateTime(2022, 2, 17, 0, 0, 0, 0)
val end = new DateTime(2022, 4, 30, 0, 0, 0, 0)
val months = Months.monthsBetween(start, end).getMonths

println(months) // Prints 2

Is there an API that I can use to get the remaining days? I'm also not sure how the months are calculated. In this example., it prints 2 months. So what is the basis for calculating this? Does it take 28 days, 30 or 31 days? How does this work?