Unix Timestamp Converter
Convert Unix timestamps to human-readable dates or dates to Unix timestamps with our free unix timestamp converter. Auto-detects seconds vs. milliseconds, supports 15+ timezones, and outputs ISO 8601, RFC 2822, locale string, and more — all with a live clock and copy buttons. No signup required.
Convert Unix timestamps (seconds or milliseconds) to human-readable dates, or convert any date string to a Unix timestamp. Supports multiple timezones and output formats. All processing runs locally in your browser.
- Unix epoch — January 1, 1970 00:00:00 UTC = timestamp 0
- Seconds vs milliseconds — 10-digit timestamps are seconds; 13-digit are milliseconds
- ISO 8601 — the recommended format:
2024-01-15T10:30:00Z - Negative timestamps — dates before Jan 1, 1970 have negative Unix timestamps
- Year 2038 problem — 32-bit signed integers overflow at Unix timestamp 2,147,483,647 (Jan 19, 2038)
Why Use Our Unix Timestamp Converter?
Fast, accurate, and comprehensive Unix timestamp conversion online
Instant Unix Timestamp Conversion
Convert Unix timestamps to human-readable dates or dates to Unix timestamps instantly in your browser. Our unix timestamp converter auto-detects seconds vs. milliseconds and processes any input in milliseconds.
Secure Unix Timestamp Converter Online
All Unix timestamp conversions happen locally in your browser. Your timestamps and dates never leave your device, ensuring 100% privacy every time you use our unix timestamp converter online.
Unix Timestamp Converter - No Installation
Use our unix timestamp converter directly in any browser with no downloads, plugins, or software required. Convert timestamps from any device — desktop, tablet, or mobile — instantly.
Multiple Timezones and Output Formats
Convert timestamps across 15+ timezones including UTC, US, European, and Asian zones. Output in ISO 8601, locale string, RFC 2822, date-only, time-only, or raw Unix seconds and milliseconds.
Common Use Cases for Unix Timestamp Converter
Practical applications for Unix timestamp conversion online
API Response Debugging
REST APIs and databases commonly return Unix timestamps in responses. Use our unix timestamp converter to instantly decode timestamps from API responses, logs, and JSON payloads into readable dates for debugging.
Database Timestamp Inspection
Database columns storing Unix timestamps are unreadable without conversion. Paste any timestamp from your database query results into our unix timestamp converter to see the exact date and time instantly.
Log File Analysis
Server logs, application logs, and event streams often use Unix timestamps for precision. Our unix timestamp converter helps you quickly decode log timestamps to understand when events occurred relative to each other.
JWT Token Expiry Checking
JWT tokens contain Unix timestamps in their exp, iat, and nbf claims. Use our unix timestamp converter to decode these values and verify whether a token is expired, when it was issued, and when it becomes valid.
Scheduled Task and Cron Verification
When setting up scheduled tasks, webhooks, or cron jobs with Unix timestamp triggers, use our converter to verify that your timestamps correspond to the correct dates and times in the target timezone.
Cross-Timezone Date Coordination
Unix timestamps are timezone-agnostic, making them ideal for coordinating events across timezones. Convert a timestamp to multiple timezones using our unix timestamp converter to verify meeting times and deadlines.
Understanding Unix Timestamps
Learn what Unix timestamps are and how to convert them accurately
What is a Unix Timestamp?
A Unix timestamp (also called epoch time or POSIX time) is a system for describing a point in time as the number of seconds that have elapsed since the Unix epoch — January 1, 1970, 00:00:00 UTC. Unix timestamps are timezone-agnostic: the same timestamp represents the same moment in time regardless of where in the world you are. Our unix timestamp converter supports both second-precision timestamps (10 digits, e.g., 1705312200) and millisecond-precision timestamps (13 digits, e.g., 1705312200000), auto-detecting which format you have entered. Negative timestamps represent dates before January 1, 1970.
How Our Unix Timestamp Converter Works
- Enter Your Input: Paste a Unix timestamp (seconds or milliseconds) to convert to a date, or enter a date string in ISO 8601 or any standard format to convert to a Unix timestamp. Click Use Current Time to load the current moment instantly.
- Select Timezone and Convert: Choose your target timezone from the dropdown — UTC, local browser time, or any of 15+ named timezones. Click the convert button and the unix timestamp converter processes your input entirely in your browser. Your data never leaves your device.
- Copy Any Output Format: The results panel shows your timestamp in all formats simultaneously — ISO 8601, locale string, RFC 2822, date-only, time-only, Unix seconds, and Unix milliseconds. Each field has a Copy button for instant clipboard access.
What the Unix Timestamp Converter Shows
- Unix Seconds and Milliseconds: The raw timestamp in both second-precision (10 digits) and millisecond-precision (13 digits) formats for use in different programming contexts.
- ISO 8601: The international standard date format (2024-01-15T10:30:00.000Z) — the recommended format for APIs, databases, and data interchange.
- Locale and RFC 2822: Human-readable formats including a locale-formatted string (Jan 15, 2024, 10:30:00 AM UTC) and RFC 2822 format used in email headers and HTTP dates.
- Relative Time and Week Number: How long ago or in the future the timestamp is relative to now, plus the ISO week number and day of the week for calendar context.
Seconds vs. Milliseconds — How to Tell the Difference
Unix timestamps in seconds are typically 10 digits long (e.g., 1705312200 for January 2024). Unix timestamps in millisecondsare 13 digits long (e.g., 1705312200000). Our unix timestamp converter auto-detects which format you have entered based on the number of digits — 10 or fewer digits are treated as seconds, 11 or more digits are treated as milliseconds. JavaScript's Date.now() and new Date().getTime() return milliseconds, while most Unix system calls and many databases use seconds.
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Frequently Asked Questions About Unix Timestamp Converter
Common questions about Unix timestamps and epoch time conversion
A Unix timestamp converter is a tool that converts Unix timestamps (the number of seconds or milliseconds since January 1, 1970 UTC) to human-readable dates, and converts dates back to Unix timestamps. Our unix timestamp converter runs entirely in your browser with a live clock, multiple timezone support, and all output formats — no signup required.
Unix timestamps in seconds are typically 10 digits long (e.g., 1705312200). Timestamps in milliseconds are 13 digits long (e.g., 1705312200000). Our unix timestamp converter auto-detects the format based on digit count — 10 or fewer digits are treated as seconds, 11 or more as milliseconds.
Absolutely. All Unix timestamp conversions happen locally in your browser using JavaScript. Your timestamps and dates are never sent to any server, stored, or logged. Your data stays completely private on your device.
Yes — our Unix timestamp converter is 100% free with no signup, no account, and no usage limits. Convert timestamps as many times as you need, completely free forever.
The Unix epoch is the reference point for Unix timestamps: January 1, 1970, 00:00:00 UTC. A Unix timestamp of 0 represents this exact moment. Positive timestamps represent moments after the epoch; negative timestamps represent moments before it (dates in 1969 and earlier).
The Year 2038 problem (also called Y2K38) occurs because many systems store Unix timestamps as 32-bit signed integers, which can only represent values up to 2,147,483,647 — corresponding to January 19, 2038, 03:14:07 UTC. After this point, 32-bit systems will overflow. Modern systems use 64-bit integers, which can represent dates billions of years into the future.
In JavaScript, use new Date(timestamp * 1000) for second-precision timestamps (multiply by 1000 to convert to milliseconds), or new Date(timestamp) for millisecond-precision timestamps. To get the current Unix timestamp in seconds, use Math.floor(Date.now() / 1000). Our unix timestamp converter does all of this automatically.
Unix timestamps are always stored in UTC (Coordinated Universal Time) to avoid timezone ambiguity. When you convert a timestamp to a local time, the conversion happens at display time based on the timezone offset. This makes Unix timestamps ideal for storing and comparing times across different timezones without confusion.