typecast timestamps with .to_time

Author: pboling

lib/activerecord-postgres-array/string.rb

@@ -32,6 +32,8 @@ def from_postgres_array(base_type = :string)
         elements.collect(&:to_f)
       elsif base_type == :integer || base_type == :bigint
         elements.collect(&:to_i)
+      elsif base_type == :timestamp
+        elements.collect(&:to_time)
       else
         elements
       end