Unix Timestamp Converter: Epoch to Date & Date to Epoch
Translate computer time to human time. Convert Unix timestamps (seconds or milliseconds) to readable dates, or generate accurate epoch timestamps from any date. Essential for developers debugging database entries and API logs.
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Key Features
- Convert Unix timestamp to date
- Convert date to Unix timestamp
- Support for seconds and milliseconds
- Multiple date format outputs
- ISO 8601 and UTC formats
- dd-mm-yyyy date format
- No data sent to servers - complete privacy
- Free to use, no registration required
How to Use the Unix Timestamp Converter
- Convert Timestamp to Date: Enter a Unix timestamp and check "Milliseconds" if needed. The tool automatically converts it to date formats.
- Convert Date to Timestamp: Enter a date and time, or click "Now" for current time. The tool automatically converts it to Unix timestamp.
- View Results: Results show multiple date formats including local time, ISO 8601, UTC, and Unix timestamp.
Why Use This Unix Timestamp Converter?
Computers track time as a running total of seconds since January 1, 1970 (the "Unix Epoch"). While efficient for machines (e.g., 1738240000), it's meaningless to humans.
Our Unix Timestamp Converter bridges this gap. It handles both standard timestamps (seconds) and JavaScript timestamps (milliseconds). It also provides multiple output formats, including ISO 8601 (for JSON APIs) and UTC (for server logs), making it the perfect sidekick for backend development.
Frequently Asked Questions
What is a Unix timestamp?
A Unix timestamp (also called epoch time) is the number of seconds or milliseconds that have elapsed since January 1, 1970, 00:00:00 UTC. It's a standard way to represent time in computing.
Why does Unix time start in 1970?
The Unix operating system was born in 1969 at Bell Labs. Engineers chose January 1, 1970, as the "epoch" (starting point) because it was a recent, round number that simplified calculations. It has since become the universal standard.
What is the Y2K38 Problem?
On January 19, 2038, at 03:14:07 UTC, 32-bit systems will overflow (similar to Y2K). The maximum value a signed 32-bit integer can hold is 2,147,483,647 seconds. After this, it wraps to negative, causing dates to reset to 1901. Modern 64-bit systems are safe for billions of years, but legacy embedded systems (IoT devices, old servers) remain vulnerable.
How do I know if a timestamp is in seconds or milliseconds?
Check the number of digits. Timestamps in seconds have 10 digits (e.g., 1738240000). Timestamps in milliseconds have 13 digits (e.g., 1738240000000). JavaScript uses milliseconds, while most backend languages (Python, PHP, Go) use seconds.
Should I store timestamps or formatted dates in my database?
Always store timestamps (integers) in your database, not formatted strings like "2025-01-10". Timestamps are timezone-independent, sortable, and enable easy date math (e.g., "find records from last 7 days"). Format them to human-readable strings only in your application's presentation layer.
What do negative timestamps mean?
Negative timestamps represent dates before January 1, 1970. For example, -86400 is December 31, 1969. This is useful for historical data or birth dates of people born before 1970.
Why is my timestamp off by several hours?
This is a timezone issue. Unix timestamps are always in UTC (Coordinated Universal Time). When you convert them to local time, your browser or system applies your timezone offset. If you're in New York (UTC-5), a timestamp will display 5 hours earlier than the same timestamp viewed in London (UTC+0). Always store and transmit timestamps in UTC, then convert to local time only for display.
How do I debug "Invalid Date" errors?
Common causes: (1) Mixing seconds and milliseconds—multiply by 1000 if needed. (2) Passing a string instead of a number—useparseInt(). (3) Timestamp is too large for 32-bit systems. Use our converter to verify the timestamp produces a valid date before debugging further.
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