Ecleti (www.ecleti.com) has updated Menu Calendar to version 1.4. The Mac tool makes a small calendar available under the menu bar in any running app.
Clicking Menu Calendar’s icon under the menu bar not only shows a small standard calendar that you can use to navigate inside any month, it also makes available a small area under the calendar for date calculation. You can add (or subtract) days, months, years and the app will instantly show the resulting day.
You can also optionally select from the menu to have Menu Calendar launched any time you log in to your Mac. Version 1.4 is optimized for macOS Mojave. The app requires Mac OS X 10.10 or higher and costs $1.99.