app center；增加發送ping的秒

Assets/AppCenter/Plugins/Android/Utility/JavaDateHelper.cs

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+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license.
+
+#if UNITY_ANDROID
+using System;
+using System.Globalization;
+using UnityEngine;
+
+namespace Microsoft.AppCenter.Unity.Internal.Utility
+{
+    public class JavaDateHelper
+    {
+        private const string DotNetDateFormat = "yyyy-MM-dd'T'HH:mm:ss.fffK";
+
+        private static AndroidJavaObject _javaDateFormatter;
+        private static AndroidJavaObject JavaDateFormatter
+        {
+            get
+            {
+                if (_javaDateFormatter == null)
+                {
+                    _javaDateFormatter = new AndroidJavaObject("java.text.SimpleDateFormat", "yyyy-MM-dd'T'HH:mm:ss.SSSZ");
+                }
+                return _javaDateFormatter;
+            }
+        }
+
+        public static AndroidJavaObject DateTimeConvert(DateTime date)
+        {
+            // 'DotNetDateFormat' contains timezone info with time separator. 
+            // 'javaDateFormatter' uses date format with timezone info without time separator.
+            // Time separator should be removed from date string before 'parse' call.
+            var dateString = date.ToString(DotNetDateFormat);
+            int separatorIndex = dateString.LastIndexOf(CultureInfo.CurrentCulture.DateTimeFormat.TimeSeparator);
+            dateString = dateString.Remove(separatorIndex, 1);
+            return JavaDateFormatter.Call<AndroidJavaObject>("parse", dateString);
+        }
+
+        public static DateTimeOffset DateTimeConvert(AndroidJavaObject date)
+        {
+            // Unable to use DateTimeOffset.ParseExact(dateString, DotNetDateFormat, CultureInfo.InvariantCulture) here
+            // because it throws "Invalid format string" exception
+            var dateString = JavaDateFormatter.Call<string>("format", date);
+            var dateTime = DateTime.ParseExact(dateString, DotNetDateFormat, CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal);
+            return new DateTimeOffset(dateTime);
+        }
+    }
+}
+#endif