We are calculating number of days between custom property with current date value

custom property date format is : MM/DD/YYYY

Current Date format is : YYYYMMDDT083648.090 GMT

By using @DateTimeDifference(@CurrentDateTime(),.custom property value,D) function getting 

-2147483648 days value. Is there any pega function available for convert MM/DD/YYY value to YYYYMMDDT083648.090 GMT format.

Thanks in advance.

***Edited by Moderator Kayla to update Platform Capability tags****