🕐 Unix Timestamp Converter

The Unix Timestamp Converter translates between Unix timestamps (seconds since 1970-01-01 UTC) and human-readable dates. Timestamps appear everywhere developers work: log files, database columns, JWT expiry fields, cache headers, HTTP dates, cron schedules. Being able to translate 1735689600 into "January 1, 2025 00:00 UTC" (and back) without opening a script is the kind of small convenience that saves hundreds of context switches over a career.

How to Use This Tool

Enter a Unix timestamp in seconds and press Convert to see the equivalent date in both UTC and your browser's local timezone. Or enter a date/time and press the other direction button to get back the Unix timestamp. The tool accepts both 10-digit (seconds) and 13-digit (milliseconds) timestamps and picks the right unit automatically.

SEO Best Practices

Store timestamps as UTC seconds (or milliseconds) in your database — never as local-time strings. Convert to a user's timezone only at display time in the frontend, using the user's browser locale rather than a server-side guess. When logging events, include a UTC timestamp with subsecond precision so you can correlate log lines across systems that live in different timezones.

Example

The timestamp 1704067200 converts to Monday, January 1, 2024 00:00:00 UTC. Entering the same date in your local timezone converts back to the same timestamp minus your timezone offset in seconds — a useful sanity check when debugging timezone bugs.

Common Mistakes to Avoid

Don't confuse seconds with milliseconds: 1704067200000 is January 2024, but if you feed it to a "seconds" parser you get the year 55963. Don't assume Unix timestamps are always UTC in log files — some (older) systems record them in local time, which is a footgun. Don't store dates as strings in application-specific formats ("Jan 1, 24") when a timestamp or ISO 8601 string works everywhere.