Equinoxes in many places are festival days. But astronomically speaking, an equinox happens at a specific time. The September 2020 equinox occurred when the Sun crossed the celestial equator from north to south. This happened yesterday (September 22) at 13:30 UTC (Coordinated Universal Time), which is essentially GMT (Greenwich Mean Time).
The time the equinox occurred in your location depends on your time zone. For people in Britain, this was 14:30 BST (British Summer Time) - 2:30 pm. In western Europe, it was 15:30, in New York, 9:30 am, and in California 6:30 am.
In Melbourne, Australia the time of the equinox was 11:30 pm and in New Zealand it was 1:30 am on September 23. And in the whole southern hemisphere it was the spring equinox.