Passing Date/Time picker as variable in API Call

Hi all,

I'm puzzled with one setup. I have 5 date time pickers in my page, that I'm sending to a text field.

On an action, I will POST and API call to XAno. However, when I went for the setup, there is no Timestamp option for the variable and I'm not sure if I should setup as integer, double or string. Or something else.

Any help?

Gustavo