Useful timestamps

Most of our APIs, including Server API, Webhooks and JavaScript agent, support useful timestamps related to a visitor in the response formats. All these timestamps are presented as ISO-8601 strings (UTC timezone, millisecond precision). The majority of popular programming languages support ISO-8601 time format in their standard libraries.

Format

That's what those timestamps look like in the responses of the corresponding APIs:

{
  // ...
  "firstSeenAt": {
    "global": "2022-03-16T11:26:45.362Z",
    "subscription": "2022-03-16T11:31:01.101Z"
  },
  "lastSeenAt": {
    "global": "2022-03-16T11:28:34.023Z",
    "subscription": null
  },
  // ...
}

Definitions

• firstSeenAt.subscription - time of the first visit of the visitor within the current subscription.
• firstSeenAt.global - time of the first visit of the visitor across all subscriptions.
• lastSeenAt.subscription - time of the previous visit of the visitor within the current subscription.
• lastSeenAt.global - time of the previous visit of the visitor across all subscriptions.

Those timestamps can be null. For instance in case a completely new visitor comes,
both lastSeenAt timestamps will be equal to null, because there is no previous visit before the first visit. In case a visitor comes for the first time within your subscription, but has been seen within another subscription, lastSeenAt.subscription will be null and lastSeenAt.global won't.