Microsoft Graph: Unable to update Start or End Date of an event

Question

I'm using Microsoft Graph .NET SDK to update outlook events. Following code successfully updates the Subject, and Body attributes of an event. But when I try to update the Start and/or End dates of the the event (that are of the dateTimeTimeZone type) I get the error shown below:

Question: What may be the cause of the error, and how can we resolve it? Please note that the event has valid local Start and End dates as 8/21/2020 11:00AM and 8/21/2020 11:30AM respectively. Actually, in the debug mode, VS2019 is showing: Start.get returns null

Screenshot of the error:

Code:

1. The above error occurs if I uncomment the line Start = { DateTime = "2020-08-20T08:30:00.0000000", TimeZone = "UTC" } below.
2. The values of authProvider and "{id}" varibles are not that relevant to the error as the code with the real values works fine without the line Start =.... of the code.

...

GraphServiceClient graphClient = new GraphServiceClient( authProvider );

var @event = new Event
{
    Subject = "Test subject",
    Body= new ItemBody { Content = "Test body content"}
    //Start = { DateTime = "2020-08-20T08:30:00.0000000", TimeZone = "UTC" }
};

await graphClient.Me.Events["{id}"]
    .Request()
    .UpdateAsync(@event);

Answer 1

You need something like this instead because of the object type being used in the property

            var @event = new Event
        {
            Subject = "Test subject",
            Body = new ItemBody { Content = "Test body content" },
            Start = new DateTimeTimeZone {  DateTime = "2020-08-20T08:30:00.0000000", TimeZone = "UTC" } 
        };

Answer 2

You need to add date in below format. Hope it will solve your issue.

var @event = new Event
    {
        Subject = "Test subject",
        Body = new ItemBody { Content = "Test body content" },
        Start = new DateTimeTimeZone {  DateTime = "2020-08-20T08:30:00.0000000", TimeZone = "GMT Standard Time" } 
    };