ISDATE String Function
| Use: | Determines if the provided parameter is a valid date. | 
| Syntax: |  | 
| Arguments: |  | 
| Returns: | 1 = If the input is valid date  0 = If the input is not valid date  | 
| Example: |  Result: 0  | 
| Use: | Determines if the provided parameter is a valid date. | 
| Syntax: |  | 
| Arguments: |  | 
| Returns: | 1 = If the input is valid date  0 = If the input is not valid date  | 
| Example: |  Result: 0  |