api-docs/docs/browser-tracker/markdown/browser-tracker.clientsession.firsteventtimestamp.md
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[Home](./index.md) > [@snowplow/browser-tracker](./browser-tracker.md) > [ClientSession](./browser-tracker.clientsession.md) > [firstEventTimestamp](./browser-tracker.clientsession.firsteventtimestamp.md)
## ClientSession.firstEventTimestamp property
Date-time timestamp of when the first event in the session was tracked
<b>Signature:</b>
```typescript
firstEventTimestamp: string | null;
```