🌍 Time Zone Converter
9:00 in New York is what time in Kathmandu? Pick a time and two zones — DST rules applied automatically from the browser's own timezone database.
New York (Eastern)
Sat, Jul 18, 2026, 09:00 AM
GMT-04:00
Kathmandu
Sat, Jul 18, 2026, 06:45 PM
GMT+05:45
DST applied automatically from the browser's IANA timezone database — works offline.
How the time zone converter works
The browser ships the full IANA time zone database — the canonical registry of every zone's UTC offset and daylight-saving rules, past and future. The converter resolves your chosen wall-clock time in the source zone to an absolute instant, then renders that instant in the target zone. DST transitions, half-hour offsets (India, +5:30) and 45-minute offsets (Nepal, +5:45) are all handled by the same database your OS clock uses.
The classic scheduling failure is converting the offset instead of the moment: "New York is UTC−5" is only true in winter — it's UTC−4 under daylight saving. Because two regions change DST on different dates, the gap between them shifts twice a year; always convert a specific date's time, never a remembered offset.
Frequently asked questions
Does this handle daylight saving time?
Yes — automatically. The browser's IANA database knows each zone's DST rules and transition dates, so converting a July time and a January time between the same two zones can correctly give different gaps.
Why do some zones differ by 30 or 45 minutes?
Not all offsets are whole hours: India is UTC+5:30, Iran +3:30, and Nepal +5:45. The IANA database encodes these exactly, and the converter shows the resolved offsets so you can verify.
What is the IANA time zone database?
The open registry (also called tz or zoneinfo) of the world's time zone rules, maintained under IANA and used by every major operating system and programming language. Zones are named Region/City, like Asia/Kolkata.
Which zone should I store times in?
The engineering convention: store instants in UTC, convert to local zones only for display. That way a stored time never shifts meaning when DST rules change.
Is anything sent to a server?
No — the timezone database ships inside your browser, so conversion is entirely local and even works offline.