Was hoping for something more surprising. Dates and times are fertile ground. Rephrased, this problem is that "unit quantity + container quantity yields differ

Was hoping for something more surprising. Dates and times are fertile ground. Rephrased, this problem is that "unit quantity + container quantity yields different results when container quantity varies". On Feb 26th: > Time.now + 1.month + 5.days => Mar 31st > Time.now + 5.days + 1.month => Apr 3rd ... IIRC, #month is a Rails-ism, not part of Ruby.