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Term: TO_DATE. Definition: The Oracle TO_DATE function will convert either a character string or an expression into a date value. Example Syntax. These all show valid date formats for February 16th, 2009: to_date('16-Feb-09', 'DD-Mon-YY') to_date('02/16/09', 'MM/DD/YY') to_date('021609', 'MMDDYY')
First check the variable and see if it's the type date or string.. If it's string, convert to type date using function ToDate.. Each of the two fields being used in the calx need to be type date.. Then, you can use a function such as DaysBetween to calculate the dayst between the two dates.