If you ever fought, this might help.
Here’s a DEV write-up on a public world time API that needs no sign-ups or keys, and it’s CORS-enabled.
Highlights:
- Offsets + dst flag included
- IP-based timezone https://deannawkis438684.tokka-blog.com/40008920/no-signup-world-time-api-no-api-keys-cors-ready