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Under the Tests folder are some test functions that were written for a previous Date class (not based on the C++20 date namespace) and day counts.

You should first update the Catch.hpp file; this contains all the test functions in Catch2, implemented as template functions. See https://github.com/catchorg/Catch2/blob/master/README.md for more information. You will only need to download the Catch.hpp file, but there is a tutorial and more information on their GitHub site.

Next, you can use the old tests, in the DateTests folder of this repository, and modify them if you like, to write new tests with the same coverage. With the day count tests, however, you will need to check against the specifications of each day count convention, and not vs Excel, for the 30/360 tests. Act/360 and Act/365 should match with Excel. We will also need to add new tests for each new piece of functionality.

The two 30/360 conventions are:
a) ISDA 30/360
b) EUR 30/360

The definitions are given in the links provided in the comments inside the source code.

See function implementation.

In the XLDate class implementation, implement the weekday() function. It has already been declared in the .h file.

It should return a bool true if the date is on a weekday, and false otherwise. You can use the dayOfWeek() function to check the day of week, and condition the state on its result.

Should be valid out to 2199.12.31 per Excel standard.

In the XLDate class implementation, implement the dayOfWeek() function. It is already declared in the header file. It should return an integer value, either 0 through 6, or 1 through 7, representing the day of the week (eg Tues). It is not clear which index applies; you will need to look through the date.h file (C++20) to try to figure this out.