On Jooble, the filter of job sorting by date works, based on two algorithms.
Vacancy's date of publication on our website and date of publication on the original source.
By changing the publication date, the number of vacancies will change, but the job display algorithms will still refer to two dates.
The filter in the settings sorts the vacancies by the time when the job appeared on the Jooble website.
But the job description shows the date of appearance of vacancies on the site-source.

date filter works