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-rw-r--r--activesupport/lib/active_support/duration.rb4
1 files changed, 2 insertions, 2 deletions
diff --git a/activesupport/lib/active_support/duration.rb b/activesupport/lib/active_support/duration.rb
index 3696697224..8e518cb00b 100644
--- a/activesupport/lib/active_support/duration.rb
+++ b/activesupport/lib/active_support/duration.rb
@@ -65,13 +65,13 @@ module ActiveSupport
def sum(sign, time = ::Time.now) #:nodoc:
parts.inject(time) do |t,(type,number)|
- if t.respond_to?(:sec) # quacks like a Time
+ if t.acts_like?(:time)
if type == :seconds
t + (sign * number)
else
t.advance(type => sign * number)
end
- elsif t.respond_to?(:day) # quacks like a Date
+ elsif t.acts_like?(:date)
raise ArgumentError, "Adding seconds to a Date does not make sense" if type == :seconds
t.advance(type => sign * number)
else