In my table I have a dateCreated column in the format of DATETIME.
How do I insert the current datetime when I add the record to the database?
Better use TIMESTAMP instead and use CURRENT_TIMESTAMP to get current timestamp. TIMESTAMP should behave exaclty (or very similar) to DATETIME so you shouldn't notice a difference.
Furthermore you may set CURRENT_TIMESTAMP as default for all new entries.
Use the CURDATETIME()