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5 changes: 4 additions & 1 deletion src/connections/spec/common.md
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Expand Up @@ -304,6 +304,9 @@ Every API call has four timestamps, `originalTimestamp`, `timestamp`, `sentAt` a

**All timestamps are [ISO-8601](http://en.wikipedia.org/wiki/ISO_8601) date strings.**

> note ""
> **NOTE:** ISO-8601 date strings with timezones included are required when using timestamps with [Personas](/docs/personas/). Sending custom traits without a timezone included in the timestamp will result in the value not being saved.

### Timestamp Overview

<table>
Expand Down Expand Up @@ -343,7 +346,7 @@ Every API call has four timestamps, `originalTimestamp`, `timestamp`, `sentAt` a
</tr>
<tr>
<td>`receivedAt`</td>
<td>time on Segment server clock when call was received</td>
<td>Time on Segment server clock when call was received</td>
<td>
Used by Segment to calculate `timestamp`, and used as sort key in Warehouses.
<br><br>
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3 changes: 3 additions & 0 deletions src/connections/storage/warehouses/schema.md
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Expand Up @@ -336,6 +336,9 @@ All four timestamps pass through to your Warehouse for every ETL'd event. In mos

`received_at` does not ensure chronology of events. For queries based on event chronology, `timestamp` should be used.

> note ""
> **NOTE:** ISO-8601 date strings with timezones included are required when using timestamps with [Personas](/docs/personas/). Sending custom traits without a timezone included in the timestamp will result in the value not being saved.

To learn more about timestamps in Segment, [read our timestamps overview](/docs/connections/spec/common/#timestamps) in the Segment Spec.

## id
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