Harmonic Calendar support

Email jquuub@gmail.com for help or feedback. Harmonic Calendar is developed by Jakub Stanio.

For a bug report, include your device, operating system, app version and steps to reproduce the issue. A screenshot can help; leave out sensitive personal information.

Getting started

Use H/G to compare the same day in Harmonic and Gregorian. Open the calendar-grid button to browse months and years, select a day, or return to Today. The information button opens About, privacy and licenses.

Harmonic has 13 months of 28 days, with Sol between June and July and a Leap Week after December in selected years. It is an International Fixed Calendar variant with its own leap rules. The calendar guide explains the differences.

Widgets

Run the app once, then add Harmonic Date from the iPhone or iPad Home Screen widget gallery, or the Mac desktop widget gallery. The small widget’s H/G switch changes its calendar independently of the main window. Copies on the same device share that widget preference.

The operating system controls widget refresh timing. If a date looks stale, open the app, check the device’s date and time settings, and allow the widget to refresh. If the issue continues, contact support.

Mac menu bar

The menu bar shows today’s Harmonic date. Click it for the date card, Open Calendar and Quit. Closing the main window keeps the menu bar running; Quit exits the app.

Dates and calendar accounts

Both calendars follow your device’s local time zone. Harmonic month and year boundaries can differ from Gregorian ones. Use Gregorian dates for appointments and official dates.

The app displays dates; it does not create events or reminders, sync with Apple Calendar or Google Calendar, or change the system calendar.

Price and requirements

The first release is free, with no advertisements, subscriptions or In-App Purchases. Viewing dates works offline and needs no account. It requires iOS/iPadOS 26.4 or later, or macOS 26.4 or later. App Store availability will be linked from the project page once the app is released.

For information about local preferences and support email, read the privacy policy.