Its when the next UN general assembly meets:

The 80th session of the UN General Assembly (UNGA) opens on September 9, 2025. Two weeks later, High-Level General Debate kicks off Tuesday, September 23, 2025.

As the United Nations marks its 80th year, global leaders will convene in New York City to build consensus and confront complex global challenges. Eight decades after its establishment, the UN remains the only place on Earth where countries can gather to work through their differences and find common ground — shaping our shared future.

Spacing it to September is both a deadline and a stick for Israel. If acknowledged as a nation by enough countries, Palenstine gains rights it doesn’t currently have to redress/self governance/etc. Its largely symbolic, as enforcing them will be challenging, but it makes a lot of what Israel has done to Palenstinies harder.

Israel very, very much does not want this to happen. This is some countries like France saying “fuck it, we aren’t covering for you anymore now that the starving kids pictures are showing up” while countries like the UK are saying “fix the dying kids or else” and countries like Germany are saying “we committed genocide against you so we wont begrudge you your own because we consider letting you murder children some kind of weird german liberal guilt thing.”