# OpcClient.ReadNodeHistoryAtTime Method

<dl class="api-definition">
<dt>Type</dt>
<dd><a href="./">OpcClient</a></dd>
<dt>Namespace</dt>
<dd><a href="../namespaces/opc.uafx.client">Opc.UaFx.Client</a></dd>
<dt>Assembly</dt>
<dd>Opc.UaFx.Advanced.dll</dd>
<dt>Package</dt>
<dd>Opc.UaFx.Advanced v2.59.0</dd>
<dt>Members</dt>
<dd><a href="./members">OpcClient Members</a></dd>
<dt>Also in</dt>
<dd>Opc.UaFx.Client</dd>
</dl>

<span class="api-meta">18 overloads</span>

| Overload | Description |
|---|---|
| [ReadNodeHistoryAtTime(DateTime, OpcNodeId)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnodehistoryattime#readnodehistoryattime-system-datetime-opc-uafx-opcnodeid) |  |
| [ReadNodeHistoryAtTime(DateTime\[\], OpcNodeId)](#readnodehistoryattime-system-datetime-array-opc-uafx-opcnodeid) |  |
| [ReadNodeHistoryAtTime(IEnumerable&lt;DateTime&gt;, OpcNodeId)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnodehistoryattime#readnodehistoryattime-system-collections-generic-ienumerable-of-system-datetime-opc-uafx-opcnodeid) |  |
| [ReadNodeHistoryAtTime(DateTime, string)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnodehistoryattime#readnodehistoryattime-system-datetime-system-string) |  |
| [ReadNodeHistoryAtTime(DateTime\[\], string)](#readnodehistoryattime-system-datetime-array-system-string) |  |
| [ReadNodeHistoryAtTime(IEnumerable&lt;DateTime&gt;, string)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnodehistoryattime#readnodehistoryattime-system-collections-generic-ienumerable-of-system-datetime-system-string) |  |
| [ReadNodeHistoryAtTime(DateTime, int)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnodehistoryattime#readnodehistoryattime-system-datetime-system-int32) |  |
| [ReadNodeHistoryAtTime(DateTime\[\], int)](#readnodehistoryattime-system-datetime-array-system-int32) |  |
| [ReadNodeHistoryAtTime(IEnumerable&lt;DateTime&gt;, int)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnodehistoryattime#readnodehistoryattime-system-collections-generic-ienumerable-of-system-datetime-system-int32) |  |
| [ReadNodeHistoryAtTime(DateTime, string, int)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnodehistoryattime#readnodehistoryattime-system-datetime-system-string-system-int32) |  |
| [ReadNodeHistoryAtTime(DateTime\[\], string, int)](#readnodehistoryattime-system-datetime-array-system-string-system-int32) |  |
| [ReadNodeHistoryAtTime(IEnumerable&lt;DateTime&gt;, string, int)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnodehistoryattime#readnodehistoryattime-system-collections-generic-ienumerable-of-system-datetime-system-string-system-int32) |  |
| [ReadNodeHistoryAtTime(DateTime, int, int)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnodehistoryattime#readnodehistoryattime-system-datetime-system-int32-system-int32) |  |
| [ReadNodeHistoryAtTime(DateTime\[\], int, int)](#readnodehistoryattime-system-datetime-array-system-int32-system-int32) |  |
| [ReadNodeHistoryAtTime(IEnumerable&lt;DateTime&gt;, int, int)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnodehistoryattime#readnodehistoryattime-system-collections-generic-ienumerable-of-system-datetime-system-int32-system-int32) |  |
| [ReadNodeHistoryAtTime(DateTime, OpcReadNodeHistory)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnodehistoryattime#readnodehistoryattime-system-datetime-opc-uafx-client-opcreadnodehistory) |  |
| [ReadNodeHistoryAtTime(DateTime\[\], OpcReadNodeHistory)](#readnodehistoryattime-system-datetime-array-opc-uafx-client-opcreadnodehistory) |  |
| [ReadNodeHistoryAtTime(IEnumerable&lt;DateTime&gt;, OpcReadNodeHistory)](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcclient/readnodehistoryattime#readnodehistoryattime-system-collections-generic-ienumerable-of-system-datetime-opc-uafx-client-opcreadnodehistory) |  |

**Exceptions (all overloads)**

| Exception | Condition |
|---|---|
| [ArgumentNullException](https://learn.microsoft.com/dotnet/api/system.argumentnullexception) |  |
| [InvalidOperationException](https://learn.microsoft.com/dotnet/api/system.invalidoperationexception) |  |
| [OpcException](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcexception/) |  |
| [ObjectDisposedException](https://learn.microsoft.com/dotnet/api/system.objectdisposedexception) |  |

## ReadNodeHistoryAtTime(DateTime, OpcNodeId)

<div class="api-signature" data-lang="csharp">

```csharp
public OpcHistoryValue ReadNodeHistoryAtTime(DateTime time, OpcNodeId nodeId)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNodeHistoryAtTime(
    time As Date,
    nodeId As OpcNodeId) As OpcHistoryValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `time` | [DateTime](https://learn.microsoft.com/dotnet/api/system.datetime) |  |
| `nodeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) |  |

**Returns**

[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) |  |

## ReadNodeHistoryAtTime(DateTime\[\], OpcNodeId)

<div class="api-signature" data-lang="csharp">

```csharp
public IEnumerable<OpcHistoryValue> ReadNodeHistoryAtTime(
    DateTime[] times,
    OpcNodeId nodeId)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNodeHistoryAtTime(
    times As Date(),
    nodeId As OpcNodeId) As IEnumerable(Of OpcHistoryValue)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `times` | [DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)[] |  |
| `nodeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) |  |

**Returns**

[IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)&gt;

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) |  |

## ReadNodeHistoryAtTime(IEnumerable&lt;DateTime&gt;, OpcNodeId)

<div class="api-signature" data-lang="csharp">

```csharp
public IEnumerable<OpcHistoryValue> ReadNodeHistoryAtTime(
    IEnumerable<DateTime> times,
    OpcNodeId nodeId)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNodeHistoryAtTime(
    times As IEnumerable(Of Date),
    nodeId As OpcNodeId) As IEnumerable(Of OpcHistoryValue)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `times` | [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)&gt; |  |
| `nodeId` | [OpcNodeId](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opcnodeid/) |  |

**Returns**

[IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)&gt;

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) |  |

## ReadNodeHistoryAtTime(DateTime, string)

<div class="api-signature" data-lang="csharp">

```csharp
public OpcHistoryValue ReadNodeHistoryAtTime(DateTime time, string nodeId)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNodeHistoryAtTime(
    time As Date,
    nodeId As String) As OpcHistoryValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `time` | [DateTime](https://learn.microsoft.com/dotnet/api/system.datetime) |  |
| `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) |  |

**Returns**

[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) |  |

## ReadNodeHistoryAtTime(DateTime\[\], string)

<div class="api-signature" data-lang="csharp">

```csharp
public IEnumerable<OpcHistoryValue> ReadNodeHistoryAtTime(
    DateTime[] times,
    string nodeId)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNodeHistoryAtTime(
    times As Date(),
    nodeId As String) As IEnumerable(Of OpcHistoryValue)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `times` | [DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)[] |  |
| `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) |  |

**Returns**

[IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)&gt;

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) |  |

## ReadNodeHistoryAtTime(IEnumerable&lt;DateTime&gt;, string)

<div class="api-signature" data-lang="csharp">

```csharp
public IEnumerable<OpcHistoryValue> ReadNodeHistoryAtTime(
    IEnumerable<DateTime> times,
    string nodeId)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNodeHistoryAtTime(
    times As IEnumerable(Of Date),
    nodeId As String) As IEnumerable(Of OpcHistoryValue)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `times` | [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)&gt; |  |
| `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) |  |

**Returns**

[IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)&gt;

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) |  |

## ReadNodeHistoryAtTime(DateTime, int)

<div class="api-signature" data-lang="csharp">

```csharp
public OpcHistoryValue ReadNodeHistoryAtTime(DateTime time, int nodeId)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNodeHistoryAtTime(
    time As Date,
    nodeId As Integer) As OpcHistoryValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `time` | [DateTime](https://learn.microsoft.com/dotnet/api/system.datetime) |  |
| `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) |  |

**Returns**

[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) |  |

## ReadNodeHistoryAtTime(DateTime\[\], int)

<div class="api-signature" data-lang="csharp">

```csharp
public IEnumerable<OpcHistoryValue> ReadNodeHistoryAtTime(
    DateTime[] times,
    int nodeId)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNodeHistoryAtTime(
    times As Date(),
    nodeId As Integer) As IEnumerable(Of OpcHistoryValue)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `times` | [DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)[] |  |
| `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) |  |

**Returns**

[IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)&gt;

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) |  |

## ReadNodeHistoryAtTime(IEnumerable&lt;DateTime&gt;, int)

<div class="api-signature" data-lang="csharp">

```csharp
public IEnumerable<OpcHistoryValue> ReadNodeHistoryAtTime(
    IEnumerable<DateTime> times,
    int nodeId)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNodeHistoryAtTime(
    times As IEnumerable(Of Date),
    nodeId As Integer) As IEnumerable(Of OpcHistoryValue)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `times` | [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)&gt; |  |
| `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) |  |

**Returns**

[IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)&gt;

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) |  |

## ReadNodeHistoryAtTime(DateTime, string, int)

<div class="api-signature" data-lang="csharp">

```csharp
public OpcHistoryValue ReadNodeHistoryAtTime(
    DateTime time,
    string nodeId,
    int namespaceIndex)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNodeHistoryAtTime(
    time As Date,
    nodeId As String,
    namespaceIndex As Integer) As OpcHistoryValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `time` | [DateTime](https://learn.microsoft.com/dotnet/api/system.datetime) |  |
| `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) |  |
| `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) |  |

**Returns**

[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) |  |

## ReadNodeHistoryAtTime(DateTime\[\], string, int)

<div class="api-signature" data-lang="csharp">

```csharp
public IEnumerable<OpcHistoryValue> ReadNodeHistoryAtTime(
    DateTime[] times,
    string nodeId,
    int namespaceIndex)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNodeHistoryAtTime(
    times As Date(),
    nodeId As String,
    namespaceIndex As Integer) As IEnumerable(Of OpcHistoryValue)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `times` | [DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)[] |  |
| `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) |  |
| `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) |  |

**Returns**

[IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)&gt;

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) |  |

## ReadNodeHistoryAtTime(IEnumerable&lt;DateTime&gt;, string, int)

<div class="api-signature" data-lang="csharp">

```csharp
public IEnumerable<OpcHistoryValue> ReadNodeHistoryAtTime(
    IEnumerable<DateTime> times,
    string nodeId,
    int namespaceIndex)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNodeHistoryAtTime(
    times As IEnumerable(Of Date),
    nodeId As String,
    namespaceIndex As Integer) As IEnumerable(Of OpcHistoryValue)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `times` | [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)&gt; |  |
| `nodeId` | [String](https://learn.microsoft.com/dotnet/api/system.string) |  |
| `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) |  |

**Returns**

[IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)&gt;

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) |  |

## ReadNodeHistoryAtTime(DateTime, int, int)

<div class="api-signature" data-lang="csharp">

```csharp
public OpcHistoryValue ReadNodeHistoryAtTime(
    DateTime time,
    int nodeId,
    int namespaceIndex)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNodeHistoryAtTime(
    time As Date,
    nodeId As Integer,
    namespaceIndex As Integer) As OpcHistoryValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `time` | [DateTime](https://learn.microsoft.com/dotnet/api/system.datetime) |  |
| `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) |  |
| `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) |  |

**Returns**

[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) |  |

## ReadNodeHistoryAtTime(DateTime\[\], int, int)

<div class="api-signature" data-lang="csharp">

```csharp
public IEnumerable<OpcHistoryValue> ReadNodeHistoryAtTime(
    DateTime[] times,
    int nodeId,
    int namespaceIndex)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNodeHistoryAtTime(
    times As Date(),
    nodeId As Integer,
    namespaceIndex As Integer) As IEnumerable(Of OpcHistoryValue)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `times` | [DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)[] |  |
| `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) |  |
| `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) |  |

**Returns**

[IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)&gt;

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) |  |

## ReadNodeHistoryAtTime(IEnumerable&lt;DateTime&gt;, int, int)

<div class="api-signature" data-lang="csharp">

```csharp
public IEnumerable<OpcHistoryValue> ReadNodeHistoryAtTime(
    IEnumerable<DateTime> times,
    int nodeId,
    int namespaceIndex)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNodeHistoryAtTime(
    times As IEnumerable(Of Date),
    nodeId As Integer,
    namespaceIndex As Integer) As IEnumerable(Of OpcHistoryValue)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `times` | [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)&gt; |  |
| `nodeId` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) |  |
| `namespaceIndex` | [Int32](https://learn.microsoft.com/dotnet/api/system.int32) |  |

**Returns**

[IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)&gt;

**Exceptions**

| Exception | Condition |
|---|---|
| [ArgumentException](https://learn.microsoft.com/dotnet/api/system.argumentexception) |  |

## ReadNodeHistoryAtTime(DateTime, OpcReadNodeHistory)

<div class="api-signature" data-lang="csharp">

```csharp
public OpcHistoryValue ReadNodeHistoryAtTime(
    DateTime time,
    OpcReadNodeHistory command)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNodeHistoryAtTime(
    time As Date,
    command As OpcReadNodeHistory) As OpcHistoryValue
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `time` | [DateTime](https://learn.microsoft.com/dotnet/api/system.datetime) |  |
| `command` | [OpcReadNodeHistory](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcreadnodehistory/) |  |

**Returns**

[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)

## ReadNodeHistoryAtTime(DateTime\[\], OpcReadNodeHistory)

<div class="api-signature" data-lang="csharp">

```csharp
public IEnumerable<OpcHistoryValue> ReadNodeHistoryAtTime(
    DateTime[] times,
    OpcReadNodeHistory command)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNodeHistoryAtTime(
    times As Date(),
    command As OpcReadNodeHistory) As IEnumerable(Of OpcHistoryValue)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `times` | [DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)[] |  |
| `command` | [OpcReadNodeHistory](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcreadnodehistory/) |  |

**Returns**

[IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)&gt;

## ReadNodeHistoryAtTime(IEnumerable&lt;DateTime&gt;, OpcReadNodeHistory)

<div class="api-signature" data-lang="csharp">

```csharp
public IEnumerable<OpcHistoryValue> ReadNodeHistoryAtTime(
    IEnumerable<DateTime> times,
    OpcReadNodeHistory command)
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Function ReadNodeHistoryAtTime(
    times As IEnumerable(Of Date),
    command As OpcReadNodeHistory) As IEnumerable(Of OpcHistoryValue)
```

</div>

**Parameters**

| Name | Type | Description |
|---|---|---|
| `times` | [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[DateTime](https://learn.microsoft.com/dotnet/api/system.datetime)&gt; |  |
| `command` | [OpcReadNodeHistory](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.client.opcreadnodehistory/) |  |

**Returns**

[IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1)&lt;[OpcHistoryValue](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opchistoryvalue/)&gt;