Timestamp Converter

How Unix Timestamp Conversion Works

A Unix timestamp is the number of seconds (or milliseconds) elapsed since 1970-01-01T00:00:00Z, the Unix epoch. Toolkiya takes either a numeric timestamp or a human-readable date and converts between them using the browser's native Date object and Intl APIs.

When you enter a timestamp, the tool detects whether it is seconds (10 digits), milliseconds (13 digits), microseconds, or nanoseconds, then renders it in UTC, your local timezone, and a list of common zones (America/New_York, Europe/London, Asia/Kolkata, Asia/Tokyo). When you enter a date string, the tool parses it with Date.parse and shows the corresponding timestamp in seconds and milliseconds. ISO 8601, RFC 2822, and most common date formats are recognized.

When to Convert Timestamps

Debugging an API response that returns Unix timestamps instead of ISO dates. Translating a log line's epoch field into a readable date during incident response. Checking when a JWT was issued or when it expires. Converting a database 'created_at' integer into a human-friendly time. Verifying that a scheduled task fires at the right moment across multiple timezones.

Why Convert Timestamps in Toolkiya

Timestamps from production logs and JWTs often reveal internal infrastructure details — server clock drift, deployment windows, user activity. Toolkiya runs the conversion entirely in your browser using built-in date APIs, so the values you paste never reach a third-party server.

There is no signup, no rate limit, and no daily quota. The conversion is instant and works offline once the page is loaded, which is handy when you are debugging on a flaky network or a flight.

Tips for Timestamp Work

When in doubt about seconds vs milliseconds, check the digit count: 10 digits is seconds and 13 is milliseconds for any date in the current era. Always store timestamps in UTC and convert to local time only at the display layer. Watch for the year 2038 problem if you are working with signed 32-bit Unix timestamps in legacy systems.