Update Saudi Arabia calendar: Founding Day and Eid Al-Adha through 2029

[PureSaber]

Summary

• Add Founding Day (22 Feb from 2022; 23 Feb 2025 per exchange calendar).
• Extend Eid Al-Adha Gregorian anchor dates through 2029 using the existing Eid-1..Eid+4 window convention.
• Include <vector> and refresh header docs (weekend change in 2013, Founding Day, exchange URL).

Source: Saudi Exchange holiday calendar.

Test plan

• CI calendar suite
• Spot-check Founding Day 2024-02-22 and 2026-02-22 are holidays; sample Eid Al-Adha 2026 window days are holidays.

Made with Cursor

[CLAassistant]

All committers have signed the CLA.

[coveralls]

coverage: 74.896% (-0.002%) from 74.898% — PureSaber:fix/saudiarabia-founding-day-eid-adha into lballabio:master

[lballabio]

Instead of using an approximation, we could change the code here so that the dates are correct. I'd suggest something like

static std::vector<std::pair<Date,Date>> EidAlAdha = {
    {Date(6, April, 1998),Date(11, April, 1998)},
    {Date(26, March, 1999),Date(31, March, 1999)},
    ...
};
return std::any_of(EidAlAdha.begin(), EidAlAdha.end(),
                               [=](auto p) { return d >= p.first && d <= p.second; });

What do you think?

[lballabio]

If the rule is that the holiday rolls on the next Sunday when it falls on a Friday or a Saturday, you can write it as a generic rule instead of maintaining the present and future exceptions such as 2025:

            || ((d == 22 || ((d == 23 || d == 24) && w == Sunday)) && m == February && y >= 2022)

You'll have to add Weekday w = date.weekday(); at the beginning of the method.

I would also add a short test case for this.