---
title: "span_timestamp"
url: https://develop.sentry.dev/sdk/foundations/transport/event-payloads/properties/span_timestamp/
---

# undefined

* `timestamp`

  *Required*. A timestamp representing when the measuring finished. Theformat is either a string as defined in [RFC3339](https://tools.ietf.org/html/rfc3339) or a numeric (integer or float)value representing the number of seconds that have elapsed since the [Unixepoch](https://en.wikipedia.org/wiki/Unix_time).

```json
{
  "timestamp": "2011-05-02T17:41:36.955Z"
}
```

or:

```json
{
  "timestamp": 1304358096.955
}
```