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Re:I am disappoint, Wolfram Alpha by danpker on Monday March 12, 2012 @11:16AM (#3693800)
It provides the right output if the right timezone is given:

http://www.wolframalpha.com/input/?i=hours+between+1pm+est+m...

Re:I am disappoint, Wolfram Alpha by chrisrhoden on Monday March 12, 2012 @11:18AM (#3693810)
Re:I am disappoint, Wolfram Alpha by arundelo on Monday March 12, 2012 @07:27PM (#3696197)
I see 24 hours (not the correct 23) when I follow that link.

Edit: Now I see that the link has both times in EST, which is not on point. See chrisrhoden's link in a sibling to this comment.