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In addition to assigning to In, the Mathematica main loop assigns the input to InString before it is parsed as an expression. You can then retrieve InString[1] and parse the result with ToExpression, wrapping it in Defer to prevent it from evaluating immediately: In[5]:= ToExpression[InString[1], StandardForm, Defer] Out[5]= Round[SessionTime[]] You can ...

The input is stored as a downvalue in the definition of In. If you've only typed a few expressions, run Definition@In which prints a list of all the values associated with the symbol In, and copy from the line In[1] := Round[SessionTime[]]. But if you've typed hundreds of expressions, or expressions whose plain-text representations are long (like ...