Timestamp Converter
SeriousCode Timestamp Converter converts between Unix timestamps (seconds and milliseconds), ISO 8601, UTC, and local time formats. It auto-detects input format, shows relative time, provides date breakdowns (day of week, week number), and includes quick presets and a live clock — all free in your browser.
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2026-03-02T06:12:08.124Z
Quick Presets
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What is a Timestamp Converter?
A timestamp converter translates between machine-readable Unix timestamps (the number of seconds since January 1, 1970 UTC) and human-readable date formats. Developers frequently work with timestamps in APIs, databases, and log files. Our converter auto-detects whether your input is in seconds, milliseconds, or a date string, and instantly shows the equivalent in all common formats including ISO 8601, UTC, local time, and relative time.
How to Use the Timestamp Converter
- Enter a Unix timestamp (seconds or milliseconds), a date string, or an ISO 8601 formatted date
- The converter auto-detects the input format and shows all conversions instantly
- View results in Unix seconds, milliseconds, ISO 8601, UTC, local time, and relative time
- Check the date breakdown for day of week, day of year, and ISO week number
- Use quick presets like Now, Start of Day, or Unix Epoch for common values
- Click the copy button next to any format to copy it to your clipboard
Frequently Asked Questions
What input formats are supported?
The converter auto-detects Unix timestamps in seconds (10 digits) and milliseconds (13 digits), ISO 8601 date strings (e.g., 2026-01-15T10:30:00Z), and most standard date formats. Just paste or type any timestamp or date and it will be recognized.
What is the Unix epoch?
The Unix epoch is January 1, 1970 at 00:00:00 UTC. Unix timestamps count the number of seconds (or milliseconds) that have elapsed since this reference point. It's the standard time representation used in most programming languages and operating systems.
What is the difference between seconds and milliseconds timestamps?
A Unix timestamp in seconds is a 10-digit number (e.g., 1705312245), while milliseconds is a 13-digit number (e.g., 1705312245000). JavaScript's Date.now() returns milliseconds, while many APIs and databases use seconds. The converter handles both automatically.
Does the converter account for time zones?
Yes! Unix timestamps are always in UTC. The converter shows both the UTC time and your local time zone equivalent. The relative time display (e.g., 3 hours ago) is also calculated from your current local time.
Is there a live clock?
Yes! The current Unix timestamp is displayed at the top and updates in real time. You can click it to instantly use the current time as your input.