Unix Timestamp Converter
Convert Unix epoch timestamps to human readable dates and back, for developers and debugging. No signup. Ideal for logs, APIs, databases and working with time data.
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This Unix timestamp converter turns epoch timestamps into human readable dates and back again, directly in your browser. Enter a Unix timestamp to see the date and time it represents, or a date to get its timestamp. No account, no install, so developers working with logs, APIs, databases and time data can convert on any device in seconds.
How to Convert a Unix Timestamp Step by Step
- Enter the timestamp or date. Type the Unix timestamp you want to convert to a date, or the date you want to convert to a timestamp, into the input.
- Choose the direction. Select whether you are converting a timestamp to a human readable date, or a date to a Unix timestamp, depending on what you have.
- Convert. The tool converts the value, turning the timestamp into the date and time it represents, or the date into the corresponding timestamp number.
- Check the time zone. Note whether the result is in your local time or in coordinated universal time, since a timestamp is an absolute moment that displays differently by time zone.
- Use the result. Apply the converted value to your debugging, log analysis, code, or data work, having translated between the machine and human representations of time.
What a Unix Timestamp Is and Why It Exists
A Unix timestamp, also called epoch time, is a way of representing a moment in time as a single number: the count of seconds that have elapsed since a fixed reference point, the first of January nineteen seventy, in coordinated universal time. This reference moment is called the Unix epoch. So a timestamp is simply how many seconds have passed since that instant, which uniquely identifies any moment as one number.
The reason this representation exists is that a single number is far easier for computers to store, compare and calculate with than a human date made of years, months, days, hours, minutes and seconds. Comparing two timestamps is just comparing two numbers, and finding the time between them is a subtraction. This simplicity is why Unix time is used pervasively in programming, in logs, databases, APIs and file systems, as the machine friendly way to record when something happened.
The trade off is that a Unix timestamp is not human readable: the number means nothing to a person at a glance. This is where conversion comes in. Developers constantly need to translate between the timestamp that a system records and the human date that a person can understand. Reading a log entry, debugging a time related issue, or displaying a stored time to a user all require converting the timestamp into a readable date, and sometimes the reverse.
Time zones are an important subtlety with timestamps. A Unix timestamp represents an absolute moment, the same instant everywhere, defined in coordinated universal time. But when displayed as a human date, that same moment appears as different local times in different time zones. So when converting a timestamp to a date, the time zone matters for what date and time is shown, even though the underlying timestamp is a single, absolute, universal number.
Unix Time Versus Human Readable Dates
| Aspect | Unix timestamp | Human date |
|---|---|---|
| Form | A single number of seconds | Year, month, day, time |
| Reference | Seconds since 1 January 1970 UTC | Calendar and clock |
| Good for | Computers storing and comparing | People reading |
| Time zone | Absolute, universal | Shown in a local zone |
Who Uses a Unix Timestamp Converter
Pro Tips for Working With Unix Time
Common Unix Timestamp Mistakes to Avoid
Related Tools You May Need Next
For durations between dates, our Date Difference Calculator helps, and the Time Duration Calculator measures hours and minutes. To convert the timestamp number between bases, the Base Converter is available.
Frequently Asked Questions
How do I convert a Unix timestamp to a date?
Enter the Unix timestamp and choose to convert it to a date, and the tool translates the number into the human readable date and time it represents. A Unix timestamp is the count of seconds since the first of January nineteen seventy in universal time, so the converter works out which moment that many seconds corresponds to. Note the time zone of the result, since the same absolute timestamp displays as different local times in different time zones.
What is a Unix timestamp?
A Unix timestamp, also called epoch time, represents a moment in time as a single number: the count of seconds elapsed since a fixed reference point, the first of January nineteen seventy, in coordinated universal time, known as the Unix epoch. So the timestamp is simply how many seconds have passed since that instant, which uniquely identifies any moment as one number. It is used pervasively in programming because a single number is easy for computers to store, compare and calculate with.
Why do computers use Unix timestamps?
Because a single number is far easier for computers to store, compare and calculate with than a human date made of years, months, days, hours, minutes and seconds. Comparing two timestamps is just comparing two numbers, and finding the time between them is a simple subtraction. This makes Unix time the machine friendly way to record when something happened, which is why it appears throughout programming, in logs, databases, APIs and file systems, even though the number is not human readable at a glance.
Why does the time zone matter for a timestamp?
Because a Unix timestamp represents an absolute moment, the same instant everywhere, defined in coordinated universal time, but when displayed as a human date, that same moment appears as different local times in different time zones. So when you convert a timestamp to a date, the time zone determines what date and time is shown, even though the underlying timestamp is a single, universal number. This is why it matters to know whether a converted date is in your local time or universal time.
What is the difference between seconds and milliseconds timestamps?
Unix timestamps are usually measured in seconds since the epoch, but some systems use milliseconds, which are a thousand times larger, giving finer precision. This matters when converting: if you treat a milliseconds timestamp as if it were in seconds, the resulting date will be wildly wrong, far in the future, and vice versa. If a converted date looks far off, check whether the timestamp is in seconds or milliseconds, and use the matching interpretation to get the correct moment.
Can a Unix timestamp be negative?
Yes. A negative Unix timestamp represents a moment before the epoch reference point of the first of January nineteen seventy, counting seconds backward from that instant. So negative timestamps are perfectly valid and simply point to earlier dates. If you encounter a negative timestamp, it is not necessarily an error; it indicates a pre epoch moment. The converter handles these, translating a negative number into the corresponding date before nineteen seventy, just as it does positive timestamps for later moments.
How do I convert a date to a Unix timestamp?
Enter the human date and choose to convert it to a timestamp, and the tool calculates how many seconds have elapsed from the epoch reference of the first of January nineteen seventy to that date, giving the Unix timestamp. This is useful when you need to query or filter by time in a system that stores times as Unix timestamps, since you convert your readable date into the timestamp format the system uses. Be mindful of the time zone when specifying the date.
Is the Unix timestamp converter free?
Yes, it is completely free with no account and no usage limit. You can convert as many Unix timestamps to dates and dates to timestamps as you like, as often as you like, at no cost. It runs entirely in your browser on any device, so there is nothing to download or install, and the converted date or timestamp appears instantly whenever you enter a value and choose the direction of conversion.