class Time

def eql_with_coercion(other)

can be eql? to an equivalent Time
Layers additional behavior on Time#eql? so that ActiveSupport::TimeWithZone instances 
def eql_with_coercion(other)
  # if other is an ActiveSupport::TimeWithZone, coerce a Time instance from it so we can do eql? comparison
  other = other.comparable_time if other.respond_to?(:comparable_time)
  eql_without_coercion(other)
end