A> First of all there is no seperate date type for Dates. So it has to fall back to string.
https://www.w3schools.com/js/js_json_datatypes.asp
In JSON, values must be one of the following data types:
a string
a number
an object (JSON object)
an array
a boolean
null
B> So to get the current date-time use this plain js
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toJSON
var jsonDate = (new Date()).toJSON();
console.log(jsonDate);
2018-05-19T13:30:37.435Z
An example below -
{
"customerId": "abc",
"driverId": "de",
"orderItems": [
0,
1
],
"selectedRestaurant": "mn",
"createdAt": "2018-05-19T14:53:49.198Z",
"updatedAt": "2018-05-19T14:54:49.198Z",
"deletedAt": "2018-05-19T14:54:49.198Z",
"completed": true,
"specialInstructions": "Call me"
}