ORA-01830: date format picture ends before converting entire input string

Summary:

Getting above error while running query with date parameter instead of parameter if i give sysdate it is working fine

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Code Snippet (add any code snippets that support your topic, if applicable):

select ROUND(TO_DATE(:CUT_OFF )-TRUNC(add_months(trunc(add_months(SYSDATE , -3), 'yyyy'), 3)),0)+2 from dual