> ## Documentation Index
> Fetch the complete documentation index at: https://docs.revyops.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Dates and Timezones

> Date and time formats used by the RevyOps API.

## Storage and output

All timestamps are stored and returned in UTC, in ISO 8601 format:

```
2026-09-20T14:03:11Z
```

Fields like `updated_time`, `first_campaign_email_sent`, `last_campaign_email_sent`, `last_reply_received`, and the LinkedIn activity timestamps (`first_linkedin_message_sent`, `last_linkedin_connection_accepted`, and so on) all follow this format. A field with no recorded value is returned as `null`.

## Sending dates

When you send a date or datetime value, for example a custom field of type date, use ISO 8601:

```
2026-09-20
2026-09-20T14:03:11Z
```

There is no separate timezone parameter or offset conversion on the API. If you send a timestamp without a UTC offset, treat it as UTC on the RevyOps side.

## Sorting

List endpoints that expose an implicit order (for example contacts) sort by `updated_time` descending, most recently updated first, with `id` as a tiebreaker.