Most timezone APIs look simple on the surface — until you're handling millions of requests across 400+ timezones and your edge cases start stacking up.

Here's what breaks in production:

• DST transitions — half the APIs out there return stale offsets during spring-forward/fall-back windows

• Historical timezone changes — countries change their UTC offset more often than you'd think (looking at you, Morocco)

• Sub-second latency — if your scheduling app adds 200ms per timezone lookup, your UX is cooked

We built World Time API specifically for backend teams who can't afford any of that. Every response comes from pre-computed, validated data with sub-50ms p99 latency.

If you're building anything that touches time across regions — scheduling, fintech, IoT, automation — this is what you've been looking for.