Date submission error

I'm attempting to post a date to Xano, but it is consistently returning 0. I have successfully done it before in the past using the date formats as suggested in the following post: https://docs.xano.com/data-manipulation/timestamp
I have tried submitting Unix timestamps as strings and numbers, and all combinations of the above accepted formats.

I am aware that the date format in the screenshot is not approved, but this is more to demonstrate what is getting returned.
[Screenshot 2021-06-23 at 08.31.38.png]
Any help would be appreciated.
Thanks!