iCalendar
Version: 1.0.0 | License: Microsoft Store (standard / Pro)
Microsoft Store: You typically get a standard edition with limited functionality and can unlock Pro in the Store. Exact limits and offline rules appear in the Store listing and in the app and may change. This web documentation does not state fixed trial days or start counts.
What is iCalendar?
iCalendar is a local calendar with iCloud/CalDAV synchronization, recurring appointments, and German holidays. Developed with PySide6.
Features
- Month, Week, and Day View: Different calendar views
- iCloud/CalDAV Synchronization: Two-way sync with iCloud
- Recurring Appointments (RRULE): Daily, weekly, monthly, yearly
- German Holidays: Automatic calculation based on Easter date
- Categories with Colors: Important, To-Do, Private, Family, Shift, Holiday
- Birthdays from Contacts: Display of birthdays
- Appointment Search: Search all appointments by title
- Print with Preview: Monthly and yearly overviews
- Local Cache: Offline access to all appointments
- License / offline: If the app shows offline rules, those prompts apply (not fixed in this doc).
- Dark/Light Theme: Dark and light design
- Multilingual: German and English
Requirements & Limitations:
- Standard vs. Pro scope: see the Microsoft Store and in-app prompts.
- No Google Calendar support
- No Outlook.com support
- Only iCloud and CalDAV-compatible servers
- Offline use: only as permitted by your installed build (see app messages).
- Windows only
System Requirements
| Component | Requirement |
|---|
| Operating System | Windows 10/11 (64-bit) |
| RAM | 4 GB minimum, 8 GB recommended |
| Storage | 100 MB + calendar data |
| Internet | Required for synchronization and license check |
| .NET Runtime | .NET 6.0 or higher |
Installation
1 Download iCalendar.
2 Run the setup.
3 Start iCalendar.
4 Follow the license or Store prompts shown by your installed build.
Set Up iCloud
1 Open Settings.
2 Select "iCloud" as provider.
3 Enter your Apple ID.
4 Create an app-specific password at appleid.apple.com.
5 Enter the app password (not your normal password).
6 Select the calendar to synchronize.
Create Appointment
1 Double-click on a day in the month view.
2 Or click the "New Appointment" button.
3 Enter title, start and end time.
4 Select a category (Important, To-Do, Private, etc.).
5 Optionally add notes and location.
6 Save the appointment.
Recurring Appointments
1 Create a new appointment.
2 Enable "Repeat".
3 Select frequency: Daily, Weekly, Monthly, or Yearly.
4 Optionally enter an end date.
5 Save - all occurrences will be created.
German Holidays
1 Holidays are calculated automatically.
2 Based on the Easter date.
3 Includes: New Year, Good Friday, Easter Monday, Labor Day, Ascension Day, Pentecost Monday, German Unity Day, Christmas Days.
Printing
1 Click the printer icon in the toolbar.
2 Select view: Month or Year.
3 A preview is displayed.
4 Click "Print".
Troubleshooting
| Problem | Solution |
|---|
| "No active license" |
Check the Microsoft Store for a Pro unlock and follow the messages shown in the app. |
| Synchronization failed |
Check Apple ID and app password. Make sure CalDAV is enabled in iCloud. |
| Offline / license prompt from the app |
Follow the guidance for your installed build; you may need internet for Store validation. |
| Appointments not displayed |
Check category filters. Make sure the correct calendar is selected. |
Keyboard Shortcuts
| Key Combination | Function |
|---|
| Ctrl + N | New appointment |
| Ctrl + F | Appointment search |
| Ctrl + P | Print |
| Ctrl + S | Synchronize |
| Del | Delete appointment |
| F2 | Edit appointment |
License
- iCalendar: Microsoft Store (standard / Pro)
- PySide6: LGPL License
- dateutil: Apache 2.0 License