Calendar events

Calendar events are entries on the calendar -- not to be confused with "events", which track all activity in Basecamp. A calendar event can belong to a project or to a standalone calendar.

If a calendar event is an all day affair, its starts_at and ends_at values will be dates. For a timed calendar event, the starts_at and ends_at values are times with timezones.

Get calendar events

GET /projects/1/calendar_events.json will return upcoming calendar events for the project.
GET /calendars/1/calendar_events.json will return upcoming calendar events for the calendar.
GET /projects/1/calendar_events/past.json will return past calendar events for the project.
GET /calendars/1/calendar_events/past.json will return past calendar events for the calendar.

[
  {
    "id": 883432030,
    "summary": "something coming up",
    "description": "",
    "created_at": "2012-03-28T11:50:00-05:00",
    "updated_at": "2012-03-28T12:24:59-05:00",
    "all_day": false,
    "starts_at": "2012-03-28T07:00:00-05:00",
    "ends_at": "2012-03-28T07:00:00-05:00",
    "comments_count": 0,
    "private": false,
    "trashed": false,
    "creator": {
      "id": 149087659,
      "name": "Jason Fried",
      "avatar_url": "https://asset0.37img.com/global/4113d0a133a32931be8934e70b2ea21efeff72c1/avatar.96.gif?r=3",
      "fullsize_avatar_url": "https://asset0.37img.com/global/4113d0a133a32931be8934e70b2ea21efeff72c1/original.gif?r=3"
    },
    "url": "https://basecamp.com/999999999/api/v1/projects/605816632/calendar_events/883432030.json",
    "app_url": "https://basecamp.com/999999999/projects/605816632/calendar_events/883432030"
  },
  {
    "id": 883432031,
    "summary": "More stuff for later",
    "description": "Details will follow",
    "created_at": "2012-03-28T12:29:16-05:00",
    "updated_at": "2012-03-28T12:29:16-05:00",
    "all_day": true,
    "starts_at": "2012-03-28",
    "ends_at": "2012-03-28",
    "comments_count": 0,
    "private": false,
    "trashed": false,
    "creator": {
      "id": 149087659,
      "name": "Jason Fried",
      "avatar_url": "https://asset0.37img.com/global/4113d0a133a32931be8934e70b2ea21efeff72c1/avatar.96.gif?r=3",
      "fullsize_avatar_url": "https://asset0.37img.com/global/4113d0a133a32931be8934e70b2ea21efeff72c1/original.gif?r=3"
    },
    "url": "https://basecamp.com/999999999/api/v1/projects/605816632/calendar_events/883432031.json",
    "app_url": "https://basecamp.com/999999999/projects/605816632/calendar_events/883432031"
  },
  {
    "id": 1030049109,
    "summary": "Weekly meeting",
    "description": "To discuss business",
    "created_at": "2014-07-09T09:40:33.000-05:00",
    "updated_at": "2014-07-09T09:40:33.000-05:00",
    "all_day": true,
    "starts_at": "2014-07-10",
    "ends_at": "2014-07-10",
    "comments_count": 0,
    "private": false,
    "trashed": false,
    "creator": {
      "id": 149087659,
      "name": "Jason Fried",
      "avatar_url": "https://asset0.37img.com/global/4113d0a133a32931be8934e70b2ea21efeff72c1/avatar.96.gif?r=3",
      "fullsize_avatar_url": "https://asset0.37img.com/global/4113d0a133a32931be8934e70b2ea21efeff72c1/original.gif?r=3"
    },
    "recurring": {
      "frequency": "weekly",
      "count": null,
      "until": null,
      "excluding": [2, 3]
    },
    "url": "https://basecamp.com/999999999/api/v1/projects/605816632/calendar_events/1030049109.json",
    "app_url": "https://basecamp.com/999999999/projects/605816632/calendar_events/1030049109"
  }
]

GET /calendar_events.json?start_date=2014-07-10 will return six weeks of calendar events after the start date for the account, including recurrences.
GET /projects/1/calendar_events.json?start_date=2014-07-10 will return six weeks of calendar events after the start date for the project, including recurrences.
GET /calendars/1/calendar_events.json?start_date=2014-07-10 will return six weeks of calendar events after the start date for the calendar, including recurrences.
GET /calendar_events.json?start_date=2014-07-10&end_date=2014-07-12 will return calendar events between the start and end date for the account, including recurrences. The start and end date can be up to six weeks apart.
GET /projects/1/calendar_events.json?start_date=2014-07-10&end_date=2014-07-12 will return calendar events between the start and end date for the project, including recurrences. The start and end date can be up to six weeks apart.
GET /calendars/1/calendar_events.json?start_date=2014-07-10&end_date=2014-07-12 will return calendar events between the start and end date for the calendar, including recurrences. The start and end date can be up to six weeks apart.

[
  {
    "id": 1030049109,
    "summary": "Weekly meeting",
    "description": "To discuss business",
    "created_at": "2014-07-10T09:40:33.000-05:00",
    "updated_at": "2014-07-10T09:40:33.000-05:00",
    "all_day": true,
    "starts_at": "2014-07-10",
    "ends_at": "2014-07-10",
    "comments_count": 0,
    "private": false,
    "trashed": false,
    "creator": {
      "id": 149087659,
      "name": "Jason Fried",
      "avatar_url": "https://asset0.37img.com/global/4113d0a133a32931be8934e70b2ea21efeff72c1/avatar.96.gif?r=3",
      "fullsize_avatar_url": "https://asset0.37img.com/global/4113d0a133a32931be8934e70b2ea21efeff72c1/original.gif?r=3"
    },
    "recurring": {
      "frequency": "weekly",
      "count": 5,
      "until": null,
      "excluding": [2, 3]
    },
    "url": "https://basecamp.com/999999999/api/v1/projects/605816632/calendar_events/1030049109.json",
    "app_url": "https://basecamp.com/999999999/projects/605816632/calendar_events/1030049109"
  },
  {
    "summary": "Weekly meeting",
    "description": "To discuss business",
    "all_day": true,
    "starts_at": "2014-07-10",
    "ends_at": "2014-07-10",
    "private": false,
    "trashed": false,
    "creator": {
      "id": 149087659,
      "name": "Jason Fried",
      "avatar_url": "https://asset0.37img.com/global/4113d0a133a32931be8934e70b2ea21efeff72c1/avatar.96.gif?r=3",
      "fullsize_avatar_url": "https://asset0.37img.com/global/4113d0a133a32931be8934e70b2ea21efeff72c1/original.gif?r=3"
    },
    "recurrence": {
      "number": 1,
      "master": {
        "id": 1030049109,
        "url": "https://basecamp.com/999999999/api/v1/projects/605816632/calendar_events/1030049109.json",
        "app_url": "https://basecamp.com/999999999/projects/605816632/calendar_events/1030049109"
      }
    }
  },
  {
    "summary": "Weekly meeting",
    "description": "To discuss business",
    "all_day": true,
    "starts_at": "2014-07-10",
    "ends_at": "2014-07-10",
    "comments_count": 0,
    "private": false,
    "trashed": false,
    "creator": {
      "id": 149087659,
      "name": "Jason Fried",
      "avatar_url": "https://asset0.37img.com/global/4113d0a133a32931be8934e70b2ea21efeff72c1/avatar.96.gif?r=3",
      "fullsize_avatar_url": "https://asset0.37img.com/global/4113d0a133a32931be8934e70b2ea21efeff72c1/original.gif?r=3"
    },
    "recurrence": {
      "number": 4,
      "master": {
        "id": 1030049109,
        "url": "https://basecamp.com/999999999/api/v1/projects/605816632/calendar_events/1030049109.json",
        "app_url": "https://basecamp.com/999999999/projects/605816632/calendar_events/1030049109"
      }
    }
  }
]

See Recurring calendar events for more information.

Endpoints that include recurrences are paginated within the specified window and return 50 calendar events per page. It is your responsibility to check if the next page contains more calendar events. You do this by specifying a page parameter -- /calendar_events.json?start_date=2014-07-10&page=2, /calendar_events.json?start_date=2014-07-10&page=3, and so on.

Get calendar event

GET /projects/1/calendar_events/1.json will return the specified calendar event.
GET /calendars/1/calendar_events/1.json will return the specified calendar event.

{
  "id": 883432030,
  "summary": "something coming up",
  "description": "",
  "created_at": "2012-03-28T11:50:00-05:00",
  "updated_at": "2012-03-28T12:24:59-05:00",
  "all_day": false,
  "starts_at": "2012-03-28T07:00:00-05:00",
  "ends_at": "2012-03-28T07:00:00-05:00",
  "private": false,
  "trashed": false,
  "creator": {
    "id": 149087659,
    "name": "Jason Fried",
    "avatar_url": "https://asset0.37img.com/global/4113d0a133a32931be8934e70b2ea21efeff72c1/avatar.96.gif?r=3",
    "fullsize_avatar_url": "https://asset0.37img.com/global/4113d0a133a32931be8934e70b2ea21efeff72c1/original.gif?r=3"
  },
  "url": "https://basecamp.com/999999999/api/v1/projects/605816632/calendar_events/883432030.json",
  "app_url": "https://basecamp.com/999999999/projects/605816632/calendar_events/883432030",
  "comments": [
    {
      "id": 1028592772,
      "content": "let's get it taken care of?",
      "created_at": "2012-03-28T12:24:59-05:00",
      "updated_at": "2012-03-28T12:24:59-05:00",
      "attachments": [],
      "creator": {
        "id": 149087659,
        "name": "Jason Fried",
        "avatar_url": "https://asset0.37img.com/global/4113d0a133a32931be8934e70b2ea21efeff72c1/avatar.96.gif?r=3",
        "fullsize_avatar_url": "https://asset0.37img.com/global/4113d0a133a32931be8934e70b2ea21efeff72c1/original.gif?r=3"
      }
    }
  ],
  "subscribers": [
    {
      "id": 149087659,
      "name": "Jason Fried"
    },
    {
      "id": 1071630348,
      "name": "Jeremy Kemper"
    }
  ]
}

Create calendar event

POST /projects/1/calendar_events.json will create a new calendar event for a project.
POST /calendars/1/calendar_events.json will create a new calendar event for a calendar.

Examples:

{
  "summary": "My single, all-day event",
  "description": "Details to follow",
  "all_day": true,
  "starts_at": "2012-03-28"
}

{
  "summary": "My all-day event spanning two days",
  "description": "Details to follow",
  "all_day": true,
  "starts_at": "2012-03-28",
  "ends_at": "2012-03-30"
}

{
  "summary": "My single event for a specific time",
  "description": "Details to follow",
  "starts_at": "2012-03-28T11:50:00-05:00"
}

{
  "summary": "My timed event with a reminder",
  "description": "For an email reminder, set remind_at",
  "starts_at": "2012-03-28T11:50:00-05:00",
  "remind_at": "2012-03-28T11:20:00-05:00"
}

To subscribe specific people to a calendar event pass their person IDs with the create parameters.

{
  "summary": "My single event for a specific time",
  "description": "Details to follow",
  "starts_at": "2012-03-28T11:50:00-05:00",
  "subscribers": [
    149087659,
    1071630348
  ]
}

To subscribe all people on the project to a calendar event pass "all" with the create parameters.

{
  "summary": "My single event for a specific time",
  "description": "Details to follow",
  "starts_at": "2012-03-28T11:50:00-05:00",
  "subscribers": "all"
}

This will return 201 Created, with the URL of the new calendar_event in the Location header and a JSON representation of the event in the response body, if the creation was a success. If the dates are not in the proper format, you'll get a 400 Bad Request.

Basecamp will send a reminder email to all subscribers if remind_at is set. remind_at can't be more than three days before starts_at or any time after starts_at.

See Create a recurring event for examples of recurring events.

Update calendar event

PUT /projects/1/calendar_events/1.json will update the specific calendar event on a project.
PUT /calendars/1/calendar_events/1.json will update the specific calendar event on a calendar.

{
  "summary": "My all-day event spanning two days",
  "description": "Details to follow",
  "all_day": true,
  "starts_at": "2012-03-28",
  "ends_at": "2012-03-30"
}

To update the subscribers on an event pass their person IDs with the parameters. Note: This update will replace all subscribers, not add subscribers to the calendar event.

{
  "subscribers": [
    149087659,
    1071630348
  ]
}

To subscribe all people to a calendar event, pass "all" with the parameters.

{
  "subscribers": "all"
}

To remove all subscribers on an event pass an empty array with the parameters.

{
  "subscribers": []
}

This will return 200 OK if the creation was a success, with a JSON representation of the resource in the response body. If the dates are not in the proper format, you'll get a 400 Bad Request.

Delete calendar event

DELETE /projects/1/calendar_events/1.json will delete the calendar event specified and return 204 No Content if that was successful. (The same for /calendars/)

Recurring calendar events

For recurring events:

The frequency value may be "daily", "weekly", "monthly", or "yearly".
The count value describes how many times the event occurs.
The until value specifies the date of the last recurrence.
The count and until values are exclusive -- no event has both.
If count and until are both null for an event, it recurs infinitely.
The excluding value identifies which recurrences, indexed from 1, are skipped.

Here's a sample recurring event:

{
  "id": 1030049109,
  "summary": "Weekly meeting",
  "description": "To discuss business",
  "created_at": "2014-07-10T09:40:33.000-05:00",
  "updated_at": "2014-07-10T09:40:33.000-05:00",
  "all_day": true,
  "starts_at": "2014-07-10",
  "ends_at": "2014-07-10",
  "private": false,
  "trashed": false,
  "creator": {
    "id": 149087659,
    "name": "Jason Fried",
    "avatar_url": "https://asset0.37img.com/global/4113d0a133a32931be8934e70b2ea21efeff72c1/avatar.96.gif?r=3",
    "fullsize_avatar_url": "https://asset0.37img.com/global/4113d0a133a32931be8934e70b2ea21efeff72c1/original.gif?r=3"
  },
  "recurring": {
    "frequency": "weekly",
    "count": 5,
    "until": null,
    "excluding": [2, 3]
  },
  "url": "https://basecamp.com/999999999/api/v1/projects/605816632/calendar_events/1030049109.json",
  "app_url": "https://basecamp.com/999999999/projects/605816632/calendar_events/1030049109"
}

For recurrences of an original event, the number value specifies which recurrence is represented. Recurrences are numbered starting from 1. The first recurrence of an event is numbered 1, the second is 2, and so forth. A recurrence includes details about its originating event, such as its ID and API URL. Recurrences do not have their own IDs or URLs.

Here's a sample recurrence:

{
  "summary": "Weekly meeting",
  "description": "To discuss business",
  "all_day": true,
  "starts_at": "2014-07-10",
  "ends_at": "2014-07-10",
  "private": false,
  "trashed": false,
  "creator": {
    "id": 149087659,
    "name": "Jason Fried",
    "avatar_url": "https://asset0.37img.com/global/4113d0a133a32931be8934e70b2ea21efeff72c1/avatar.96.gif?r=3",
    "fullsize_avatar_url": "https://asset0.37img.com/global/4113d0a133a32931be8934e70b2ea21efeff72c1/original.gif?r=3"
  },
  "recurrence": {
    "number": 1,
    "master": {
      "id": 1030049109,
      "url": "https://basecamp.com/999999999/api/v1/projects/605816632/calendar_events/1030049109.json",
      "app_url": "https://basecamp.com/999999999/projects/605816632/calendar_events/1030049109"
    }
  }
}

Create a recurring event

POST /projects/1/calendar_events.json will create a new calendar event for a project.
POST /calendars/1/calendar_events.json will create a new calendar event for a calendar.

Examples:

Use count:

{
  "summary": "My weekly all-day event",
  "description": "Details to follow",
  "all_day": true,
  "recurring": {
    "starts_at": "2012-03-28",
    "frequency": "weekly",
    "count": 4
  }
}

or until:

{
  "summary": "My daily all-day event",
  "description": "Details to follow",
  "all_day": true,
  "recurring": {
    "starts_at": "2012-03-28",
    "frequency": "daily",
    "until": "2012-04-10",
    "excluding": [2,3]
  }
}

or neither for an infinitely recurring event:

{
  "summary": "Happy birthday Basecamp!",
  "description": "Another year older",
  "all_day": true,
  "recurring": {
    "starts_at": "2004-02-04",
    "frequency": "yearly"
  }
}

Private calendar events

To hide a calendar event on a project from clients, set its private attribute to true.

{
  "summary": "My timed event with a reminder",
  "description": "For an email reminder, set remind_at",
  "starts_at": "2012-03-28T11:50:00-05:00",
  "remind_at": "2012-03-28T11:20:00-05:00",
  "private": true
}

Calendars can't have clients, so you can't make events on calendars private. Attempting to do so will result in an error and a 422 Unprocessable Entity response status.

To reveal a calendar event to clients, set its private attribute to false.

Comments on a calendar event inherit its privacy. If a calendar event is made public or private, so are all of its comments.

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