ASP.Net: Get users time zone without any API on Page Load

Apart from using an API to get a user's TimeZone, is there any other way to get user's TimeZone, maybe like using JavaScript to get a user's TimeZone?

Apart from the below code, can any other means that can be used to get a user's TimeZone?

Namespaces

using System.Linq;
using System.Net;
using System.Web.Script.Serialization;

 C#

protected void Page_Load(object sender, EventArgs e)
{
    LoginDateTime();
}
 
private Location GetLocation()
{
    string ipAddress = Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
    if (string.IsNullOrEmpty(ipAddress))
    {
        ipAddress = Request.ServerVariables["REMOTE_ADDR"];
    }
    string APIKey = "API_Key";
    string url = string.Format("https://api.ip2location.io/?key={0}&ip={1}&format=json", APIKey, ipAddress);
    ServicePointManager.Expect100Continue = true;
    ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;
    using (WebClient client = new WebClient())
    {
        string json = client.DownloadString(url);
        Location location = new JavaScriptSerializer().Deserialize<Location>(json);
        return location;
    }
}
 
private void LoginDateTime()
{
    DateTime time1 = Convert.ToDateTime("2023/06/19 22:25");
    TimeZoneInfo serverTimeZone = TimeZoneInfo.FindSystemTimeZoneById("GMT Standard Time");
    TimeZoneInfo userTimeZone = TimeZoneInfo.FindSystemTimeZoneById(GetTimeZoneNameByOffsetTime(this.GetLocation().time_zone.Replace("+", "")));
    DateTime userLocalTime = TimeZoneInfo.ConvertTime(time1, serverTimeZone, userTimeZone);
    Timelbl.Text = userLocalTime.ToString("dddd, MMMM d, yyyy h:mm tt");
}
 
public string GetTimeZoneNameByOffsetTime(string offset)
{
    return TimeZoneInfo.GetSystemTimeZones().FirstOrDefault(x => x.BaseUtcOffset == TimeSpan.Parse(offset)).StandardName;
}
 
public class Location
{
    public string ip { get; set; }
    public string country_code { get; set; }
    public string country_name { get; set; }
    public string region_name { get; set; }
    public string city_name { get; set; }
    public double latitude { get; set; }
    public double longitude { get; set; }
    public string zip_code { get; set; }
    public string time_zone { get; set; }
    public string asn { get; set; }
    public string @as { get; set; }
    public bool is_proxy { get; set; }
}