fix：时区显示

src/TrackCenter.Application/Services/TrackOrders/TrackOrderService.cs

@@ -231,7 +231,7 @@ public class TrackOrderService : ApplicationServiceBase
                 IsHighlight = false,
                 IsShowHover = true,
                 Remark = item.Remarks == null || item.Remarks == "--" ? "" : item.Remarks,
-                TrackTimeZone = $"GMT{(item.TrackTimeZone >= 0 ? "+" : "-")}{GetTimeZoneStr(item.TrackTimeZone)}",
+                TrackTimeZone = DateTimeHelper.ConvertFloatToTimeZone(item.TrackTimeZone),
                 TrackTime = timeTick,
                 TrackPlace = item.TrackPlace,
                 EnContent = item.TrackEnContent,
@@ -269,19 +269,6 @@ public class TrackOrderService : ApplicationServiceBase
         return (long) (time - sTime).TotalMilliseconds;
     }
 
-    private static string GetTimeZoneStr(float timeZone)
-    {
-        var time = timeZone.ToString().Split('.');
-        if (time.Length > 1 && time[1] != "0") //如果时区有小数点
-        {
-            return time[0] + ":30";
-        }
-        else
-        {
-            return time[0] + ":00";
-        }
-    }
-
     /// <summary>
     /// 根据轨迹id删除单条轨迹
     /// </summary>