Tempus Calendar is an efficient calendar program for Windows. Linux and macOS support coming later.

It supports 3 main calendars (Gregorian, Julian, and Jewish), with more (e.g. Hijri) coming soon.

Tempus Calendar will also calculate sunrise, sunset, dawn, and dusk times based on a given location. This is all done locally - no internet connection is made. Simply put in your longitude and latitude, and the program will do all the calculations itself.

Finally, it will calculate Jewish Zmanim, Islamic Salah, and Christian prayer times.

The project is still in heavy development, and therefore in an alpha state, but it is functional enough to be useful.

You can buy the software, along with all future updates, here at itch.io.

• Gregorian, Julian, and Jewish Calendars can be used as the main calendar display
• Dates for each supported calendar, listed under each day on the month page.
• Sunrise, Sunset, Dawn, and Dusk calculations
• Jewish, Islamic, and Christian prayer times, listed on the Today page.
• HiDPI support
• Zooming interface in/out with Ctrl+ and Ctrl-
• Basic animated interface
• Sundial Time (experimental)
• Time display setting ("24:00" or "12:00pm")
• Holidays
• Creation of events
  • Start date and time
  • Weekly recurring events
  • Name and description
  • Editing events
  • Monthly, Weekly, and Today views

To run the program, download the zip file and unzip/extract it to a folder. Then, from that newly unzipped location, double click "TempusCalendar.exe".

On first launch, a screen will popup asking for your longitude and latitude. This is used to locally calculate sunrise and sunset times, as well as prayer times.

• Text Input improvements
  • Multiline textbox
• Hijri Calendar
• Linux and macOS support
• Import/Export Functionality
  • iCal and DevCal support
• More options for recurring events
  • annually, every n days, and day n of month
• Habit tracking and Tasks
• Prayer time settings for greater control
• More Holidays, and settings to choose which you want to be displayed
• Interface improvements
  • Date and Time selectors
  • Tooltips
  • Dropdown boxes

Note: Upgrades to new versions will be free for those who have already paid for a previous version.