Async and await in webapi

public async void RegenerateServerDate()
{
    DateTime dateTime = new DateTime();
    
    using (var client = new HttpClient())
    {
        client.BaseAddress = new Uri("https://localhost:8080");
        client.DefaultRequestHeaders.Accept.Clear();
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

        //error message here
        HttpResponseMessage response = await client.GetAsync("api/servertime");
        if (response.IsSuccessStatusCode)
        {
            //error message here
            string result = await response.Content.ReadAsStringAsync();
            result = Regex.Replace(result, @"[A-Za-z\]""", "");
            dateTime = DateTime.Parse(result);
        }
    }

}