Date-Time Converter with Timezone Support
Free online date-time converter to convert dates and times across timezones. Supports ISO 8601, RFC 2822, Unix timestamps, and relative time — powered by native Intl APIs.
Input Date-Time
Converted Results
ISO 8601
2026-03-30T01:19:25
RFC 2822
Mon, Mar 30, 2026, 01:19:25 GMT-4
Unix Timestamp (s)
1774847965
Unix Timestamp (ms)
1774847965000
Locale Format
03/30/2026, 01:19:25 EDT
Relative
0s ago
What Is a Date-Time Converter?
A date-time converter translates a date and time from one timezone to another while presenting the result in multiple standard formats. This tool uses the browser's built-in Intl.DateTimeFormat API for accurate IANA timezone conversions — no external libraries required. Enter any date-time, choose a source and target timezone, and instantly see the converted result in ISO 8601, RFC 2822, Unix timestamps (seconds and milliseconds), locale format, and relative time.
How to Use the Date-Time Converter
- Enter a date-time string in the input field (e.g., '2024-06-15T14:30:00'), or click 'Now' to use the current time.
- Select the source timezone that the input date-time is expressed in.
- Select the target timezone you want to convert to.
- View the converted time in six formats: ISO 8601, RFC 2822, Unix seconds, Unix milliseconds, locale format, and relative time.
- Click the copy button next to any result row to copy it to your clipboard.
Common Use Cases
- Scheduling Across Timezones — Convert meeting times between offices in different timezones to avoid confusion when planning international calls or deployments.
- API & Log Timestamp Translation — Translate timestamps from server logs or API responses in UTC into your local timezone for faster debugging.
- Cron Job Verification — Verify that scheduled cron jobs configured in UTC will trigger at the intended local time.
- ISO 8601 & RFC 2822 Formatting — Generate correctly formatted date-time strings for HTTP headers, email Date fields, or API request bodies.
FAQ
Which timezones are supported?
The tool includes 13 of the most commonly used IANA timezones spanning UTC, the Americas, Europe, Asia, Australia, and the Pacific. It uses the browser's native Intl API, so conversions respect DST rules automatically.
Does this tool handle Daylight Saving Time?
Yes. Because it relies on the browser's Intl.DateTimeFormat with IANA timezone identifiers, DST transitions are applied automatically based on the date you enter.
What date-time formats can I enter?
Any format parseable by the JavaScript Date constructor works, including ISO 8601 (2024-06-15T14:30:00), date-only strings (2024-06-15), and common forms like 'Jun 15 2024 14:30'. The input is interpreted in the selected source timezone.
Why do the Unix timestamps not change when I switch the target timezone?
Unix timestamps represent an absolute moment in time (seconds since the Unix epoch in UTC). They are identical regardless of which timezone the date is displayed in — only the human-readable formats change.