Timezone Converter & Meeting Planner
Convert a date and time from one timezone to multiple target zones, with correct daylight-saving handling and a synchronized 24-hour meeting planner grid. Runs entirely in your browser.
Features
- Smart Conversions: Convert a date and time from a source timezone to multiple target zones instantly.
- Visual Clocks: Displays cards for each target showing times, dates, current offsets, and DST status.
- Meeting Planner: Automatically generates a 24-hour synchronized grid classifying times as Business (9 AM - 5 PM), Leisure (6 AM - 9 AM, 5 PM - 10 PM), or Rest (10 PM - 6 AM).
- Interactive Tags: Search and select target zones via autocomplete datalists and manage them as dismissible pills.
- Offline & Private: The tool runs entirely in your browser using local WebAssembly. No data is sent to a server.
Timezone Reference
Select canonical IANA timezone names (e.g. Area/Location). The autocomplete fields suggest valid values as you type:
| Region | IANA Timezone | Standard/DST Offset |
|---|---|---|
| London | Europe/London | UTC+0 (GMT) / UTC+1 (BST) |
| New York | America/New_York | UTC-5 (EST) / UTC-4 (EDT) |
| Los Angeles | America/Los_Angeles | UTC-8 (PST) / UTC-7 (PDT) |
| Paris / Berlin | Europe/Paris | UTC+1 (CET) / UTC+2 (CEST) |
| Tokyo | Asia/Tokyo | UTC+9 (JST, no DST) |
| Mumbai | Asia/Kolkata | UTC+5:30 (IST, no DST) |
| Sydney | Australia/Sydney | UTC+10 (AEST) / UTC+11 (AEDT) |
| Universal Time | UTC | UTC+0 (no DST) |
Note: Half-hour and 45-minute zones (e.g. India's UTC+5:30 or Nepal's UTC+5:45) are fully supported.
FAQ
How does it handle Daylight Saving Time (DST)?
The tool bundles the complete IANA database, meaning historical, current, and future DST transitions are resolved accurately based on the date specified.
What happens on spring-forward gap times?
If a selected wall-clock time does not exist in the source zone due to a DST forward transition, the tool warns you that the time is non-existent instead of silently guessing a wrong value.
Is my data private?
Absolutely. All date, time, and timezone conversions run locally in your browser. No queries are transmitted to external servers.
Developer & Automation Access
Run it from the terminal
Same engine as this page, headless — via the gizza CLI:
gizza tool timezone-convert "2024-03-10 14:30" 'from=America/New_York' 'to=Asia/Tokyo'New to the CLI? Get gizza →
Open it by URL
Pre-fill and auto-run this tool with query parameters — the names match the API/CLI:
https://gizza.ai/tools/timezone-convert/?datetime=2024-03-10%2014%3A30&from=America%2FNew_York&to=Asia%2FTokyoMachine-readable descriptor: tool.json — title + parameters JSON Schema for agents.