Set IIS express time zone

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WCF

C#4.0

IIS7.5

IIS8

WCFServices

Hi All,

I am accessing a WCF service in my solution from URL provided(Third party).
The service is secured with WS Http Binding, having an user name ,password authentication with soap request.

I have added a service reference in my solution and passed a user name and password to service object.

ServiceReferenceAdmin client = new ServiceReferenceAdmin("WSHttpBinding_IAdmin");
            client.ClientCredentials.UserName.UserName = "one";
            client.ClientCredentials.UserName.Password = "two";
            client.callServMethod("test");

When I am calling service method, connection is created with service method-->Used a fiddler to get request and response --> and came to know --
In soap request timestap is going as a local system timestamp which is in GMT format.
And server time zone(where service i hosted) is Pacific time zone (UTC -08:00).
Because of this the authentication is failing and rejecting service method call.

Tried following different ways :
1) Changed system time zone to Pacific time zone (UTC -8:00)
2)

using(new OperationContextScope(client.InnerChannel))
            {
                OperationContext.Current.OutgoingMessageHeaders.Add(new SecurityHeader("UsernameToken", "one", "two"));
                
                string str = "acp";
            }

public class SecurityHeader : MessageHeader
        {
            
            private readonly UsernameToken _usernameToken;

            public SecurityHeader(string id, string username, string password)
            {
                _usernameToken = new UsernameToken(id, username, password);
            }

            public override string Name
            {
                get { return "Security"; }
            }

            public override string Namespace
            {
                get { return "namespace"; }
            }

            protected override void OnWriteHeaderContents(XmlDictionaryWriter writer, MessageVersion messageVersion)
            {
                XmlSerializer serializer = new XmlSerializer(typeof(UsernameToken));
                serializer.Serialize(writer, _usernameToken);
            }
        }

After all this settings SOAP request is not changing from GMT to Pacific timezone.

How to make change in timestamp of soap request?
Is there any way I can set time Zone in IIS ?

Thank you in advance for your response.
Please let me know your feedback and suggestions