How to save date data with DATETIME format use REST API

As the title says, How to save date data with DATETIME format use REST API?
No matter what I try, it is saved as a STRING.

Hello, @jbcpkr.

Create a column in advance.
Try using milliseconds.

Like this:

Result:

Best Regards, Nikita.

I converted it as below and threw it into the api.
date = new Date(‘date’).getTime()
Then I expected it to be saved as DATETIME, but it was saved as DOUBLE.

Hello, @jbcpkr.

Create a column with Datetime data type (manually) and then call the api.

Best Regards, Nikita.