Automatically changing working hours on dates (fixed and variable)

Hi,
Several countries change official working hours several times a year: summer working hours (fixed start and end dates, account for 1/6 of the whole year working days), ramadan working hours (variable start and end dates (depends on lunar calendar), account for 1/12 of the whole year working days) and the rest of the year working hours (fixed and variable start and end dates, account for 75% of the whole year working days).
Is this already implemented in ProjeQtOr ? Or is there any workaround to implement it ? Or is it on the roadmap ?
Things get complicated, when team is split over two countries or more which don't share the same start and end dates for ramadan, or summer working hours.
TIA.