Documentation for method
last-date-in-month assembled from the following types:
method last-date-in-month(Date: --> Date)
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
for all remaining dates in the month.