// Function to set cookie expiry date
function setCookieWithExpiry(cookieName, cookieValue, days) {
    // Get current date and time
    var currentDate = new Date();
    
    // Calculate expiry date
    var expiryDate = new Date(currentDate.getTime() + (days * 24 * 60 * 60 * 1000));
    
    // Convert expiry date to UTC string format
    var expiryDateString = expiryDate.toUTCString();
    
    // Set the cookie with expiry date
    document.cookie = cookieName + "=" + cookieValue + "; expires=" + expiryDateString;
}

// Usage example
setCookieWithExpiry("myCookie", "example value", 7); </script>