Im also a different asker. I live in sweden and today/yesterday our maghrib was 21:22 and fajr 02:16. Maybe i am counting wrong but it seems to me that the time to pray isha ends before isha even begins? Our isha was at 23:18. I read that isha ends after half the night, not one third. Is this wrong?
Locations above 48° to 66° have a boundary equation to measure their Isha time, as per the Fiqh consortium ruling. You pray with the people. If they combine prayers, you're allowed to combine with them, as long as it doesn't become the standard form of prayer, because it was legislated as a temporary exception.