---
title: Other calendars in Day and Week
summary: Subscribe to a Google, Outlook, Apple, Fastmail or Nextcloud calendar so its events appear next to your tasks: the steps per app, refreshing, what you see, and the limits.
audience: user
section: Guides
specs: [calendar-feeds]
screens: []
order: 64
---
# Other calendars in Day and Week

<picture><source srcset="images/week-dark.webp" media="(prefers-color-scheme: dark)"><img src="images/week-light.webp" alt="The Week calendar with timed tasks as blocks, where events from subscribed calendars are shown beside them."></picture>

With [calendar feeds](calendar-feeds.md) turned on by the server owner, you can subscribe to up to ten of your other calendars. Their events are read-only in OpenTodo and count toward a day's planned total only in the Plan; they're there so you can see your real free time while you plan.

Calendars of an account connected through [calendar sync](calendar-sync.md) refresh within minutes.

## Subscribe to another calendar

1. Copy the calendar's iCal address from its app:
   - **Google Calendar**: Settings → the calendar → *Integrate calendar* → **Secret address in iCal format**.
   - **Outlook**: Settings → Calendar → Shared calendars → *Publish a calendar* → the **ICS** link.
   - **Apple iCloud**: Calendar → the calendar's share button → **Public Calendar**, then copy the `webcal://` link.
   - **Fastmail and Nextcloud**: the calendar's *Share* or *Export* menu offers an iCal or `.ics` address.
2. In OpenTodo open **Settings → Integrations → Calendar feeds** and choose **Add calendar**.
3. Paste the address, and optionally give the calendar a name and a colour. `webcal://` addresses work too.

The server fetches the calendar straight away and then on its own schedule: as often as the calendar asks (between every 30 minutes and once a day), and every hour by default. **Refresh now** in a calendar's menu fetches it at once.

Each calendar's row shows when it was last refreshed. When fetches fail, the row shows the error and the time of the last successful refresh. A calendar that keeps failing is retried less and less often, up to every six hours. **Disable** stops fetching it and hides its events. **Delete** removes it and its events from every device.

### What you see in Day and Week

- Timed events are drawn as blocks in the calendar's colour, next to your task blocks. When a task and an event overlap, both get the overlap marker.
- All-day and multi-day events appear as chips above each day's unscheduled lane.
- Events marked as *free* in their calendar are drawn as an outline only, so the slot still reads as free.
- Events never count toward the day's planned total here; only the [Plan](calendar-views.md#plan-the-next-two-weeks) counts busy ones, overlaps once.
- Events can't be dragged, resized or completed. Tab onto an event and press Enter, or click it, to see its time, location and calendar.

The **Calendars** button in the toolbar hides or shows events on this device. Today can list them too: [Calendar events in Today](calendar-events-in-today.md).

Events are cached on each device, so Day and Week still show them offline, as of the last refresh. The toolbar then says **Calendars as of** and the time. Weeks your device has not loaded yet show no events while you're offline.

### Limits

- Up to 10 calendars per person.
- A calendar may be up to 2 MB. Events from 30 days ago to a year ahead are kept, up to 5,000 per calendar.
- Repeating events are expanded on the server. A repeat rule OpenTodo doesn't understand shows its first occurrence only, and the calendar's row gets a warning. A calendar whose events repeat so much that expanding them would take more than a few seconds keeps the occurrences found so far, with a warning that some events are left out.
- **Refresh now**, adding a calendar and changing its address count toward 12 fetches per person per hour.
- Calendars on a private network (your NAS, a home server) are refused unless the server owner allows private network targets for [webhooks](webhooks.md#private-network-protection). The same switch applies to both.