My Timezone

Introduction

My Timezone is a convenient timezone detection and lookup tool. Open the page and it instantly detects your browser/system timezone info: timezone name, IANA identifier, UTC offset, current time (updated every second), and Daylight Saving Time (DST) status.

Beyond auto-detection, you can also search for the timezone of major cities worldwide. The built-in database covers 80+ cities across Europe, Asia, the Americas, Oceania, and Africa. Enter a city name in English to quickly look up its timezone. Results are displayed in a table showing timezone name, IANA identifier, UTC offset, DST status, and current local time.

This tool is perfect for remote team collaboration, quick timezone lookups, and developers debugging internationalization features.

Technical Principles

This tool is fully client-side. Auto-detection uses JavaScript's Intl.DateTimeFormat().resolvedOptions().timeZone API to retrieve the user's system IANA timezone identifier (e.g., Asia/Shanghai). UTC offset is obtained via timeZoneName: 'longOffset' (e.g., GMT+08:00), and the human-readable timezone name via timeZoneName: 'long'.

DST detection compares January and July UTC offsets for a given timezone. If they differ and the current offset matches the larger one, DST is active. The city search uses a built-in mapping of 80+ cities to IANA timezone identifiers, supporting both exact and fuzzy matching.

Use Cases

• Check your own timezone: Open the page to instantly see your current timezone info — no input needed
• Look up overseas city timezones: Enter a city name (e.g., London, Tokyo, New York) to see its timezone, offset, and current time
• Remote team coordination: Team members can quickly confirm their timezones to schedule meetings effectively
• i18n app debugging: Developers can quickly check timezone offsets and DST status for different regions
• Travel planning: Check destination timezones before traveling to understand time differences and DST
• Server timezone config: Use IANA identifiers as reference for server timezone configuration

Frequently Asked Questions

Q: Why can't I find results when searching for a city?

A: The timezone database covers 80+ major cities worldwide. Use English city names (e.g., London, Tokyo, Paris). Fuzzy search is supported — entering part of a city name works. If still not found, try searching for another major city in the same country.

Q: How is Daylight Saving Time (DST) detected?

A: The tool compares the UTC offset in January (winter) and July (summer) for the timezone. If they differ and the current offset matches the larger value, DST is active. This detection is based on the IANA Time Zone Database and is highly accurate.

Q: Is the auto-detected timezone accurate?

A: Yes, auto-detection is based on your browser/operating system timezone settings. As long as your system timezone is set correctly, the result is accurate. VPN or proxy usage does not affect local timezone detection.

Typical Usage

View your timezone:

Open the page to instantly see your timezone name (e.g., China Standard Time), IANA identifier (Asia/Shanghai), UTC offset (GMT+08:00), current time, and DST status.

Search city timezones:

Type Tokyo in the search box and click Search to see: Japan Standard Time, Asia/Tokyo, GMT+09:00, and Tokyo's current local time. Type New York to see Eastern Time with DST status.

Related Tools

This tool belongs to the same timezone category as World Time: My Timezone shows your own timezone, while World Time lets you compare times across all time zones. To check your current IP location, use My IP Address. For timestamp conversion, Timestamp Converter turns timestamps into readable dates.