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# ResQ.Protocols.ProtocolExtensions.ToUnixMs(thisSystem.DateTimeOffset)

### [ResQ.Protocols](./ResQ.Protocols.md "ResQ.Protocols").[ProtocolExtensions](./ResQ.Protocols.ProtocolExtensions.md "ResQ.Protocols.ProtocolExtensions")

## ProtocolExtensions.ToUnixMs(this DateTimeOffset) Method

Converts a [System.DateTimeOffset](https://learn.microsoft.com/en-us/dotnet/api/system.datetimeoffset "System.DateTimeOffset") to a Unix timestamp in milliseconds.

```csharp theme={null}
public static long ToUnixMs(this System.DateTimeOffset dateTime);
```

#### Parameters

<a name="ResQ.Protocols.ProtocolExtensions.ToUnixMs(thisSystem.DateTimeOffset).dateTime" />

`dateTime` [System.DateTimeOffset](https://learn.microsoft.com/en-us/dotnet/api/system.datetimeoffset "System.DateTimeOffset")

The date and time to convert.

#### Returns

[System.Int64](https://learn.microsoft.com/en-us/dotnet/api/system.int64 "System.Int64")\
The Unix timestamp in milliseconds since January 1, 1970 UTC.

### Example

```csharp theme={null}
// Convert current time
var now = DateTimeOffset.UtcNow;
var timestamp = now.ToUnixMs();

// Set protobuf timestamp field
protoMessage.TimestampMs = timestamp;

// Convert specific time
var eventTime = new DateTimeOffset(2024, 1, 1, 0, 0, 0, TimeSpan.Zero);
var eventTimestamp = eventTime.ToUnixMs(); // 1704067200000
```

### Remarks

This method converts a [System.DateTimeOffset](https://learn.microsoft.com/en-us/dotnet/api/system.datetimeoffset "System.DateTimeOffset") to Unix time in milliseconds,
which is commonly used in protobuf messages, JSON APIs, and JavaScript interop.
The conversion accounts for the offset and returns the UTC-based timestamp.