undefined method `parse' for Time:Class Error

< ^ > P N |<>|^_>< --- | ~ ...Help

hi,,.
i used this code ..

 Time.parse("October 20th, 2008, 7:48 pm")
got this error...

NoMethodError: undefined method `parse' for Time:Class

can any one help ,
how to install the parse method???

I'm using ruby version 1.8.6..., so no error in version
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