ItsNineThere for ChatGPT

com.itsninethere/clock

World clock, time conversions, DST dates and meeting times. Free, no login.

client:ChatGPT transport:streamable-http tools:4

Install ItsNineThere in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://itsninethere.com/mcp

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs