upd

sync_time_hik/Program.cs

@@ -0,0 +1,46 @@
+using System.Net;
+using System.Text;
+
+namespace sync_time_hik
+{
+    internal class Program
+    {
+        static async Task Main(string[] args)
+        {
+#if DEBUG
+            args = new string[1];
+            args[0] = "172.16.50.13";
+#endif
+            string baseUrlU = $"http://{args[0]}";
+            var credCacheU = new CredentialCache();
+            credCacheU.Add(new Uri(baseUrlU), "Digest", new NetworkCredential("admin", "4NUDZhJ7"));
+            using (var handler = new HttpClientHandler
+            {
+                Credentials = credCacheU,
+                ServerCertificateCustomValidationCallback = (sender, cert, chain, sslPolicyErrors) => true
+            })
+            using (var httpClient = new HttpClient(handler))
+            {
+                string requestUrl = $"{baseUrlU}/ISAPI/System/time";
+
+                string xmlBody = $@"<?xml version=""1.0"" encoding=""UTF-8""?><Time><timeMode>manual</timeMode><localTime>{DateTime.Now:yyyy-MM-ddTHH:mm:ss}</localTime><timeZone>CST-3:00:00</timeZone></Time>";
+
+                // Создаем контент для PUT запроса
+                var content = new StringContent(xmlBody, Encoding.UTF8, "application/xml");
+
+                // Выполняем PUT запрос
+                var response = await httpClient.PutAsync(requestUrl, content);
+                response.EnsureSuccessStatusCode();
+                var r = response.ReasonPhrase;
+                if (r.StartsWith("OK"))
+                {
+                    Console.WriteLine("0");
+                }
+                else Console.WriteLine("1");
+            }
+#if DEBUG
+           Console.ReadKey();
+#endif
+        }
+    }
+}

sync_time_hik/sync_time_hik.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>