The implementation in LibC did a timestamp->day-of-week conversion
which looks like a valuable thing to have. But we only need it in
time_to_tm, where we already computed year/month/day -- so let's
consolidate on the day_of_week function in DateTime (which is
getting extracted to AK).
The JS tests pointed out that the implementation in DateTime
had an off-by-one in the month when doing the leap year check,
so this change fixes that bug.
Set member variables after calling mktime(), which canonicalizes
out-of-range values.
With this, DateTime::create(2020, 13, ...) will return a DateTime
on Jan 2021 (assuming the other parameters are in range).
This is just to have a pleasant way to print the current time for now:
dbg() << Core::DateTime::now();
Or if you want it as a string:
Core::DateTime::now().to_string();
