In Date§
See primary documentation in context for method last-date-in-month.
method last-date-in-month(Date:D: --> Date:D)
Returns the last date in the month of the Date
object. Otherwise, returns the invocant if the day value is already the last day of the month.
say Date.new('2015-11-24').last-date-in-month; # OUTPUT: «2015-11-30»
This should allow for much easier ranges like
$date .. $date.last-date-in-month
for all remaining dates in the month.