If you ever fought, this is a handy reference.
Here’s a DEV write-up on a public world time API that needs no sign-ups or keys, and it’s more info frontend-friendly via CORS.
Highlights:
- DST + offsets included
- Geo-IP endpoint to detect the user timezone
- Simple GET requests
Full post: https://dev.to/time-now-api/i-built-a-free-open-world-time-api-no-api-keys-cors-enabled-5en
If you work on apps that need a trusted time source. Hope it helps.