修改设备/变量 初始时间为unix

src/Directory.Build.props

@@ -5,7 +5,7 @@
 		<LangVersion>11.0</LangVersion>
 		<ImplicitUsings>enable</ImplicitUsings>
 		<Nullable>enable</Nullable>
-		<Version>5.0.3.1</Version>
+		<Version>5.0.3.2</Version>
 		<Authors>Diego</Authors>
 		<Company>Diego</Company>
 		<Product>Diego</Product>

src/ThingsGateway.Gateway.Application/Model/DeviceRunTime.cs

@@ -45,7 +45,7 @@ public class DeviceRunTime : Device
     /// 设备活跃时间
     /// </summary>
     [Description("活跃时间")]
-    public DateTime? ActiveTime { get; internal set; }
+    public DateTime? ActiveTime { get; internal set; } = DateTime.UnixEpoch.ToLocalTime();
 
     /// <summary>
     /// 设备状态

src/ThingsGateway.Gateway.Application/Model/VariableRunTime.cs

@@ -40,7 +40,7 @@ public class VariableRunTime : Variable, IVariable
     /// </summary>
     [Description("变化时间")]
     [DataTable(Order = 2, IsShow = true, Sortable = true)]
-    public DateTime? ChangeTime { get; private set; }
+    public DateTime? ChangeTime { get; private set; } = DateTime.UnixEpoch.ToLocalTime();
 
     /// <summary>
     /// 所在采集设备
@@ -72,7 +72,7 @@ public class VariableRunTime : Variable, IVariable
     /// </summary>
     [Description("采集时间")]
     [DataTable(Order = 2, IsShow = true, Sortable = true)]
-    public DateTime? CollectTime { get; private set; }
+    public DateTime? CollectTime { get; private set; } = DateTime.UnixEpoch.ToLocalTime();
 
     /// <summary>
     /// 设备名称