Timezone Converter
Convert any instant between 400+ IANA time zones in your browser. Paste ISO 8601 or unix timestamp to see UTC offset and local time. Free, no upload, no account.
Runs locally in your browser. Your input is not uploaded to DevToolMate servers.
Global IANA coverage
Input must be an instant (ISO 8601 with Z or offset, or Unix time), not a wall-clock time in the source zone. Search any IANA zone (400+ regions).
Developer Quick Tips
- Paste an ISO 8601 instant (with Z or offset) or unix timestamp to convert between any IANA zones instantly in the browser.
- Search 400+ IANA zones by name or region; defaults are your device zone and UTC. Explicit zone names avoid DST ambiguity.
- Unix timestamp auto-detects seconds (10 digits) vs milliseconds (13 digits); shows UTC instant plus source and target zone offsets.
- ISO 8601 input must include Z or offset (e.g., 2026-09-12T14:30:00Z) to represent a single point in time, not a naive wall-clock.
- All timezone math runs locally using your browser's Intl API; no upload, no account, no persistence after tab close.
Frequently asked questions
How do I convert between time zones?
Paste an instant (unix timestamp or ISO 8601 with Z or offset) into the input field. Select your source and target IANA zones. The tool displays the same instant in both zones with UTC offset and DST rules applied by your browser.
What is ISO 8601 format?
ISO 8601 is a standard instant format: YYYY-MM-DDTHH:mm:ss with Z for UTC or ±HH:mm for offset (e.g., 2026-09-12T14:30:00Z or 2026-09-12T10:30:00-04:00). Paste any ISO 8601 instant to convert it across IANA zones.
How do I convert a unix timestamp to a date in a specific timezone?
Paste your unix timestamp (seconds or milliseconds since Jan 1, 1970 UTC). The tool auto-detects the format and displays the instant in UTC. Select any IANA zone to see the same moment in that region with the correct offset and DST rules.
Can I convert a wall-clock time without a time zone?
No. This tool requires an instant, a specific point in time. Provide a unix timestamp, ISO 8601 with Z or offset, or specify an explicit IANA zone. A bare time like '14:30' is ambiguous without knowing which zone it belongs to.
What is the difference between UTC and my local time zone?
UTC is the Coordinated Universal Time standard. Your local time zone is offset from UTC by a fixed amount (e.g., -05:00 for EST) plus DST adjustments. This tool shows both the UTC instant and the local time in any IANA zone you select.
Does this timezone converter upload my input?
No. All timezone conversion and instant math runs locally in your browser using the Intl API. Your input is never uploaded to DevToolMate servers.
Is this timezone converter free and do I need an account?
Yes, Timezone Converter is completely free with no account required. Processing stays on your device for the current session.
Related tools
- Timestamp Converter: Convert Unix timestamp to date online in your browser. Free tool outputs seconds, milliseconds, ISO 8601 UTC, and local time. No upload, no account, no server processing.
- ISO 8601 Converter: ISO 8601 converter: transform Unix timestamps and dates to UTC format online. Browser-local, no upload, no account. Handles seconds, milliseconds, RFC 3339.