How to send date type ? using api?

I try to use grist api and succefully send data text and number in my react app
but I can’t sure how to send date type ?

I try to send after get text by in js
but it fail to send data. I see the null after try to send it

Hi @_Law_platform, in most parts of the API, dates are represented as unix timestamps in seconds. So I’d have guessed could work. Can you share a snippet of your code?