Custom Functions

The company that I work for has existing code that is 20+ years old that uses a custom format of '“//” when trying to pull records back over a given timeframe

Example:

Year/Month/Day

//-30 = Current Date - Field <= 30

Does Toad have any functionality to recognize this custom format? Or are we better off just transitioning all of the SQL that uses it currently with the current date - Field <= 30?