How does the Coptic calendar work with Christian one too?
My dad is in communion with the Malankara Diocese and during Eastern Holy Week I had to keep reminding him that their are others churches that are still yet to celebrate Pascha. He didn't understand the concept of Resurrection after Passover. As Easter in South India is celebrated within the Western Calender with the far-less fanfare that most jurisdictions would find as important. It is unlikely that they will ever change the calendar as it is more complicated to reorganize the work days after Easter or other Feast Days that other non-Christians in Kerala, India tolerate.