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Here's how to find the time 30 minutes ago:

var THIRTY_MINUTES_IN_MS = 30 * 60 * 1000;

var now = new Date();
var nowMs = now.getTime();
    
var thenMs = nowMs - THIRTY_MINUTES_IN_MS;
var then = new Date(thenMs);

The secret is that Date.getTime returns the number of milliseconds since the epoch, and that the Date constructor accepts these millisecond values.

It's possible, through the magic of COM interop, to call C# code from JScript or VBScript. Here's an example of how to do it from JScript.

function forEach(enumerable, delegate)
{
    for (var enumerator = new Enumerator(enumerable); !enumerator.atEnd(); enumerator.moveNext())
    {
        delegate(enumerator.item());
    }
}

Used like this:

forEach(employees,
        function(employee)
        {
            WScript.Echo(employee.Salary);
        }
    );