Pass Date from vb6 to Web-Form

Hello Folks, How are you all? I have an issue with Contract Date field, when I write date value through vb6 project to webform its working fine as using code below:

But unfortunately Web-form still not see the date value i send to it and error message shows up as "Please enter value" while the date value is exist in contract Date field (webform) as you can see in below Image. But for sure will not have this error if entered date directly to webform. Please is there any other way to pass date from vb6 to web-form? appreciated your help inadvance... Thank you

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