What if I paste "2026-06-15 09:00" — what timezone is that?

A naive datetime (no Z, no ±offset) is interpreted in the SOURCE zone you picked. Default source is UTC. To enter a Jakarta wall-clock time, set From = Asia/Jakarta first.

What input formats are accepted?

ISO 8601 with offset (`2026-06-15T12:00:00Z` or `+07:00`), naive `YYYY-MM-DD HH:mm[:ss]` (interpreted in From zone), the literal word "now", or empty (also "now").

Why use IANA zones, not abbreviations like EST or WIB?

Abbreviations are ambiguous: "IST" can mean India, Ireland, or Israel; "CST" can mean US Central, China, or Cuba. IANA zones (`Asia/Jakarta`, `America/New_York`) are unambiguous, DST-aware, and the only correct identifiers for software.

Are my entered datetimes sent to a server?

No. Conversion runs entirely in your browser using built-in `Intl` APIs. No network call, no logging.

Timezone Converter — Convert a datetime across multiple IANA timezones at once. Handles DST, ISO 8601, and naive timestamps.

How to use Timezone Converter

Paste your input on the left, choose the options you want, and the output appears instantly on the right. Everything runs in your browser — none of your data is sent to a server.

Paste or type your input in the INPUT panel
The output regenerates automatically as you type
Use Copy to put the result in your clipboard
Click Sample to load a working example

What is Timezone Converter?

Timezone Converter takes a single moment in time and shows it in many IANA zones at once — perfect for cross-team scheduling, meeting planning, log forensics, and verifying server-vs-client timestamp drift. Accepts ISO 8601 with offset (`2026-06-15T12:00:00Z`), naive datetimes interpreted in the source zone (`2026-06-15 09:00` in Asia/Jakarta), or blank for "now". DST transitions are handled automatically via the browser's `Intl.DateTimeFormat`. Default targets: UTC, Asia/Jakarta, America/New_York, Europe/London — override with any subset of the 400+ IANA zones your browser supports. Three output styles: ISO 8601 with explicit offset, locale-formatted, and an aligned table. This tool is part of santekno's developer toolbox — a curated collection of utilities built for engineers who care about speed, privacy, and simplicity.

Common use cases

Debugging API payloads and integration issues
Inspecting tokens, hashes, or encoded strings during development
Generating fixtures and sample data for tests
Sharing readable output with teammates in code reviews

FAQ

It uses `Intl.DateTimeFormat`, which the browser backs with the IANA tzdb (the same database `pytz`, Go's `time/tzdata`, and Linux `/usr/share/zoneinfo` use). DST rules including historical changes are baked in.