AIAZHHow To Use
- Enter Timestamp or Date — Paste a Unix timestamp (seconds or milliseconds) in the top field, or type a date string in the bottom field. No server upload — all conversion runs locally in your browser.
- Auto-Detect Format — The tool automatically detects whether your timestamp is seconds (10 digits) or milliseconds (13 digits), or you can toggle manually.
- View Results — See the converted date in UTC, local time, ISO 8601, RFC 2822, and relative formats. Individual components (year, month, day, day of week) are also shown.
- Convert Date to Timestamp — Enter any date string (ISO 8601, US format, or natural language) to get its Unix timestamp in both seconds and milliseconds.
- Keep It Private — Your timestamps and dates never leave your browser. No data is ever sent to any server. Close the tab and it's gone.
Frequently Asked Questions
What is a timestamp converter online free?
A timestamp converter online free is a browser-based tool that converts Unix timestamps (seconds or milliseconds since epoch) to human-readable dates and vice versa. This free timestamp converter supports IANA timezones, multiple output formats (ISO 8601, RFC 2822, relative), and auto-detects seconds vs milliseconds — all processed locally without any server upload.
What timezones are supported?
The converter shows timestamps in UTC and your local timezone using IANA timezone data. It also displays ISO 8601 format, RFC 2822, and relative time (e.g., "3 hours ago").
What date formats are accepted?
The date-to-timestamp converter accepts ISO 8601, US date formats, and natural language strings parseable by JavaScript's Date constructor.
Is my data kept private?
Yes. All conversion happens locally in your browser using JavaScript's Date object. No timestamp or date data is sent to any server.
Does it support milliseconds?
Yes. The tool auto-detects whether your timestamp is seconds (10 digits) or milliseconds (13 digits). You can also toggle the milliseconds checkbox manually.
Free Timestamp Converter Online — Unix to Date and Back
A Unix timestamp represents the number of seconds (or milliseconds) that have elapsed since January 1, 1970, 00:00:00 UTC (the Unix epoch). This timestamp converter online free supports both directions: converting a numeric Unix timestamp to a human-readable date (showing UTC, local timezone, ISO 8601, RFC 2822, relative time, and individual date components), and converting a date string back to its timestamp in both seconds and milliseconds. The epoch converter auto-detects whether your input is seconds (10 digits) or milliseconds (13 digits) using IANA timezone data for accurate local time. The "Now" buttons insert the current moment for quick reference. All processing happens locally in your browser using JavaScript's built-in Date object — no date or timestamp data is sent to any server.
How Timestamp Conversion Works Across Programming Languages
Most programming languages and databases use Unix timestamps for date/time storage. JavaScript's Date.now() returns milliseconds since epoch. Python's time.time() returns seconds as a float. MySQL's UNIX_TIMESTAMP() returns seconds. PostgreSQL's EXTRACT(EPOCH FROM ...) returns seconds as a float. This date to timestamp converter handles both conventions automatically. The date-to-timestamp direction accepts any string parseable by JavaScript's Date constructor, including ISO 8601, US date formats, and natural language strings. Whether you're debugging API responses, migrating databases, or verifying log timestamps, this free timestamp converter gives you instant, private conversions without any server upload.