WebAPI: a!fromJson() - Date issue

While calling a!fromJson() method in WebAPI, the Date and time attribute is populated as Date out of range (2147483647).
When I pass date format as "Feb 20, 2017 1:30:00 PM" in request body I confront issues, but while passing date format as “20/02/2017 1:30 PM” it works.
Code snippet:

with(
a!startProcess(
processModel: cons!SampleModel,
processParameters:
'type!{urn:com:appian:types}Employee'(action:"Update",Employee:a!fromJson(http!request.body).Employee)
          


/*a!fromJson(
http!request.body
)*/,
onSuccess: a!httpResponse(
statusCode: 200,
headers: {
a!httpHeader(name: "Content-Type", value: "application/json")
},
body: a!toJson(
index(fv!ProcessInfo,"pv", {}).Employee
)
),
onError: a!httpResponse(
statusCode: 500,
headers: {
a!httpHeader(name: "Content-Type", value: "application/json")
},
...

OriginalPostID-261414