Unix Timestamp Converter
Convert Unix (epoch) timestamps to human-readable dates and vice versa. All processing is client-side.
Frequently Asked Questions
Date.now() returns milliseconds (13-digit number). This tool auto-detects whether your input is in seconds or milliseconds based on its magnitude.How Timestamp Conversion Works
Unix epoch is the universal, timezone-independent way to represent a moment in time. Converting it to a human-readable date is a two-step operation.
Detect & Normalize
The input is checked for magnitude — values over 10¹¹ are treated as milliseconds (JavaScript-style). The value is then wrapped in new Date(ms) for cross-platform handling.
Multi-Timezone Formatting
The Intl.DateTimeFormat API formats the same moment in multiple IANA timezones. The result shows UTC, ISO 8601, RFC 2822, and common regional times from one input.
Reverse Conversion
A datetime-local input provides a local date/time string which is parsed by new Date(string). The getTime() method returns the Unix millisecond value, which is divided by 1000 for seconds.
Common Use Cases
API Response Debugging
APIs often return created_at, updated_at, or expires_at as Unix timestamps. Paste the value to instantly see the human-readable date without writing code.
Database Epoch Columns
MySQL's UNIX_TIMESTAMP(), PostgreSQL's EXTRACT(EPOCH FROM ...), and SQLite's integer dates all return seconds-based timestamps. Convert them here for quick inspection.
Log File Analysis
Server, application, and security logs often stamp events as Unix time. Converting log timestamps reveals whether incidents happened during business hours, maintenance windows, or other relevant periods.
JWT Claim Verification
JWT tokens include exp (expiry) and iat (issued at) as Unix timestamps. Convert them here to understand when a token was issued and when it expires without any library.
Scheduled Job Planning
When writing cron jobs or scheduled tasks, convert the target run time to a Unix timestamp to verify it aligns with your server's UTC clock, especially when deploying across timezones.
Global Team Coordination
The multi-timezone output shows the same moment in New York, London, Berlin, Mumbai, Tokyo, and Sydney simultaneously — invaluable for scheduling meetings or deployments across distributed teams.
