This program has a command line and also a GUI version to determine on which day a specific date was (will be). Until now, the Gregorian calendar is implemented but I will also include other calendars.
For the sake of modularity, the command line and the GUI is fully detached from the algorithms which determine the day of the week. Moreover, these algorithms are written in C, so no C++ runtime environment is required. The GUI was written in Qt therefore it is cross-platform.
Coming soon...
After installation, open the application. A language selector welcomes you.
After selecting your language, the main window appears:
The usage is then straightforward, but in case you get stuck, hover the mouse over an entry to get a concise help or click on the Help button for more a detailed guide.
//: # (Zeller's congruence is a method to determine the day the week for Gregorian or Julian calendar date.)