I don't understand your get_time function. Notably the handling of *itime* is confusing.
But generally speaking not all functions require arguments:
; (Add_2_Numbers 3 6) => 9
(defun Add_2_Numbers (num1 num2)
(+ num1 num2)
)
; (Pi_Divided_By_2) => 1.5708
(defun Pi_Divided_By_2 ()
(/ pi 2.0)
)
; (Get_DateDay) => 2457222
(defun Get_DateDay ()
(fix (getvar 'date))
)