When making a HubSpot API call to update a date picker field, I’m getting a response with “response code 400”, “error INVALID_DATE”, and the message includes “not midnight!”. This is why I’m getting this error and how I fixed this call.
In PHP 5.5 the DateTimeImmutable class was introduced. Immutable objects are nice in that they can not be modified, which helps reduce the likelihood I make certain types of errors. This is how to ensure the DateTime you’re working with is immutable.