DayOfMonth: (how) does LW work?

[Tiscan76]

I was messing with PHP 7.4.3 and v3.3.3 of the library and I'm not entirely sure if i'm doing something wrong or if the calculation is broken.

If i use the cron-expression 0 5 LW * * to calculate 5:00 at the last weekday of the month and then execute getNextRunDate('2023-10-01 00:00:00') I would expect this function to return 2023-10-31 05:00:00 but it returns 2023-10-02 05:00:00.

If i change it to getNextRunDate('2023-10-03 00:00:00') the result changes to 2023-12-30 05:00:00.

Is this a bug or did I misunderstand how LW is supposed to work?

[mabar]

From

cron-expression/src/Cron/DayOfWeekField.php

Lines 16 to 17 in 102b869

	* 'L' stands for "last". It allows you to specify constructs such as
	* "the last Friday" of a given month.

I guess it means last wednesday and not last weekday as in Quartz Scheduler (in which I found this feature, is it also somewhere else?)
Even with that in mind, it looks like a bug, because it does not match last wednesday. Also it is not a standard cron syntax and it's better to not use it.