Microsoft VBScript runtime error '800a000d' Type mismatch: 'CDate' /v8/handle_params.asp, line 323

Per Google:

• The CDate function is designed to convert a valid date and/or time expression into the Date data type.
• The error occurs when the input provided to CDate cannot be recognized as a valid date based on the system's locale settings or when the input string itself is not in a recognizable date format.
• For example, CDate("04122012") will result in a type mismatch error because it lacks the necessary delimiters between the month, day, and year. 

• Ensure the date string includes delimiters: Make sure the date string you're passing to CDate includes delimiters like hyphens or slashes to separate the month, day, and year components. For instance, instead of CDate("04122012"), use CDate("04-12-2012") or CDate("04/12/2012").
• Use an unambiguous date format: To avoid issues with locale settings, use the yyyy/mm/dd format, which is less likely to be misinterpreted.
• Validate input with IsDate(): Before using CDate, use the IsDate() function to check if the input string can be converted to a valid date. This can help prevent the error from occurring in the first place.
• Use DateSerial() instead of CDate(): If the date format is causing problems due to locale settings, consider using DateSerial() to construct the date from individual year, month, and day components.
• Address adNumeric field types: If the error occurs when working with database fields of type adNumeric (131), convert the field to a valid numeric type using CDbl() or CInt() before using CDate or other functions.
• Examine the value being passed to CDate: Debug the code to see what value is being passed to the CDate function at line 323. You can use error handling techniques or logging to inspect the value.
• Check regional date settings: Ensure that your system's regional date settings are consistent with the date format being used in the VBScript.