add cst time util

Helpers/SimApiUtil.cs

@@ -1,6 +1,10 @@
-using System.Security.Cryptography;
+using System;
+using System.Security.Cryptography;
 using System.Text;
+using System.Text.Encodings.Web;
+using System.Text.Json;
 using System.Text.RegularExpressions;
+using System.Text.Unicode;
 
 namespace SimApi.Helpers
 {
@@ -36,5 +40,27 @@ namespace SimApi.Helpers
 
             return strbul.ToString();
         }
+
+        /// <summary>
+        /// 将对象序列化成JSON （控制台输出中文不会被编码）
+        /// </summary>
+        /// <param name="obj"></param>
+        /// <returns></returns>
+        public static string Json(object obj)
+        {
+            return JsonSerializer.Serialize(obj, new JsonSerializerOptions
+            {
+                Encoder = JavaScriptEncoder.Create(UnicodeRanges.All)
+            });
+        }
+
+        /// <summary>
+        /// 获取 CST 当前时间
+        /// </summary>
+        /// <returns></returns>
+        public static DateTime GetCstNow()
+        {
+            return DateTime.UtcNow.AddHours(8);
+        }
     }
 }