If you ever fought, this might help.
Here’s a DEV write-up on a public world time API that needs no accounts or keys, and it’s frontend-friendly via CORS.
What I liked:
- Timezone + DST handled
- IP-based https://murraykygf375039.worldblogged.com/45922451/no-signup-world-time-api-no-api-keys-for-frontend