Convert timestamp to date linux command line

Timestamp To Date Converter

Convert timestamp to date or date to timestamp easily

Convert timestamp to date

Convert date to timestamp

How It Works

Timestamp Online is timestamp converver between unix timestamp and human readable form date. If you want to convert timestamp, it is sufficient to either enter your timestamp into input area, or you can construct URL with your timestamp — http://timestamp.online/timestamp/ .

Timestamp Online also supports countdown, so you can see, how much time remains to particular timestamp. URLs for countdowns have following form — http://timestamp.online/countdown/ .

Current Timestamp Examples

These examples are showing how to get current unix timestamp in seconds. These examples are returning timestamp in seconds, although some of the languages are returning timestamp in milliseconds.

Current Date and Time Examples

These examples are showing how to get current date and time that could be presented to the end-user.

Timestamp to Date Examples

These examples are showing how to convert timestamp — either in milliseconds or seconds to human readable form.

Parse Date to Timestamp Examples

These examples are showing how to parse date in human readable form to unix timestamp in either milliseconds or seconds.

Unix Time

Unix time (also known as POSIX time or Epoch time) is a system for describing instants in time, defined as the number of seconds that have elapsed since 00:00:00 Coordinated Universal Time (UTC), Thursday, 1 January 1970, not counting leap seconds. It is used widely in Unix-like and many other operating systems and file formats. Because it does not handle leap seconds, it is neither a linear representation of time nor a true representation of UTC.

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Convert a Unix timestamp to a date

The Epoch

In Unix and Linux, dates are always represented internally as the number of seconds since January 1, 1970 at 00:00 Greenwich Mean Time (GMT, nowadays UTC, or Coordinated Universal Time ). This original date is sometimes called ʻThe Epoch’. In some situations in shell scripts you have to convert the Unix time into a normal date and vice versa.

Converting dates

A conversion can go in either direction with the date command. With the option -d you specify the date to be displayed (otherwise date will display the current time). An epoch time is simply written as a decimal number preceeded by an @. For example, the 1234567890 th second since the epoch occurred in February 2009:

Conversely, you can convert a date into a Unix timestamp by using a +%s as the format specification for date . Thus you will get the current time, for example:

To convert a particular time, you need to specify it again with -d . Different representations are allowed. For the conversion of 18.12.2008 at 12:34 you specify:

Don’t forget that the time stamp is always calculated in UTC – as opposed to the written date, which is to be understood relative to your time zone. That is why you get -3600 seconds in Germany when you convert the 1.1.1970 into seconds:

Why? When it was 00:00 on 1.1.1970 in Germany, it was 23:00 the day before in the UK (at Greenwich, in London).

Linux knowledge

These articles were written by the founder of Checkmk many years ago.
They are still valid though and thus we keep them on our website.
Mathias has since then developed a monitoring software called Checkmk

Join thousands of sysadmins and receive free professional tips and tricks to help you monitor your IT-infrastructure.

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Epoch & Unix Timestamp Conversion Tools

The Current Epoch Unix Timestamp

The current epoch translates to

Time	Time Format
10/10/2021 @ 11:58pm	UTC
2021-10-10T23:58:09+00:00	ATOM
Sunday, 10-Oct-2021 23:58:09 GMT	COOKIE
2021-10-10T23:58:09+0000	ISO8601
Sun, 10 Oct 21 23:58:09 +0000	RFC822
Sunday, 10-Oct-21 23:58:09 GMT	RFC850
Sun, 10 Oct 21 23:58:09 +0000	RFC1036
Sun, 10 Oct 2021 23:58:09 +0000	RFC1123
Sun, 10 Oct 2021 23:58:09 GMT	RFC7231
Sun, 10 Oct 2021 23:58:09 +0000	RFC2822
2021-10-10T23:58:09+00:00	RFC3339
2021-10-10T23:58:09.000+00:00	RFC3339_EXTENDED
Sun, 10 Oct 2021 23:58:09 +0000	RSS
2021-10-10T23:58:09+00:00	W3C

What is the unix Timestamp?

Unix time (also known as Epoch time, POSIX time,seconds since the Epoch,or UNIX Epoch time) is a system for describing a point in time. It is the number of seconds that have elapsed since the Unix epoch, minus leap seconds; the Unix epoch is 00:00:00 UTC on 1 January 1970 (an arbitrary date); leap seconds are ignored,with a leap second having the same Unix time as the second before it, and every day is treated as if it contains exactly 86400 seconds. Due to this treatment Unix time is not a true representation of UTC.

Human Readable Time	Seconds
1 Hour	3600 Seconds
1 Day	86400 Seconds
1 Week	604800 Seconds
1 Month (30.44 days)	2629743 Seconds
1 Year (365.24 days)	31556926 Seconds

What happens on January 19, 2038?

The Year 2038 problem (also called Y2038, Epochalypse, Y2k38, or Unix Y2K) relates to representing time in many digital systems as the number of seconds passed since 00:00:00 UTC on 1 January 1970 and storing it as a signed 32-bit integer. Such implementations cannot encode times after 03:14:07 UTC on 19 January 2038. Similar to the Y2K problem, the Year 2038 problem is caused by insufficient capacity used to represent time.

The latest time since 1 January 1970 that can be stored using a signed 32-bit integer is 03:14:07 on Tuesday, 19 January 2038 (231-1 = 2,147,483,647 seconds after 1 January 1970). Programs that attempt to increment the time beyond this date will cause the value to be stored internally as a negative number, which these systems will interpret as having occurred at 20:45:52 on Friday, 13 December 1901 (2,147,483,648 seconds before 1 January 1970) rather than 19 January 2038. This is caused by integer overflow, during which the counter runs out of usable digit bits, and flips the sign bit instead. This reports a maximally negative number, and continues to count up, towards zero, and then up through the positive integers again. Resulting erroneous calculations on such systems are likely to cause problems for users and other reliant parties.

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How to convert Unix timestamps to human readable date format in Bash?

I recently got asked how to convert Unix timestamps to human readable date format in Bash.

Here is an example of how to generate a Unix timestamp using the date command:

This will output a long string of numbers like this:

This number represents the seconds since 00:00:00 UTC on 1 January 1970.

So here’s how to convert Unix timestamps to human readable date format in Bash!

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These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.

In order to convert a Unix timestamp to a human-readable date format, you can use the date command with a -d flag followed by the timestamp with a @ prefix.

So if we run the command from above to generate a new timestamp:

Then copy the output and run the date -d @ time_stamp command to decode it:

You will get an output with the date in the following format:

Also, in order to get the exact Unix time starting point, you could run the above command with a 0 :

I hope that this helps!
Regards,
Bobby

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Convert a Unix Timestamp to a Date in Vanilla JavaScript

How do you convert a Unix timestamp value into a human-readable date using vanilla JavaScript?

You can convert the Unix timestamp to a date string by following these three steps:

1. Convert the unix timestamp into milliseconds by multiplying it by 1000
2. Use the newly created milliseconds value to create a date object with the new Date() constructor method
3. Use the .toLocaleString() function to convert the date object into human-friendly date strings

In this article, we’ll walk you through each of those steps.

Let’s get started!

Table of Contents

Convert the Unix Timestamp to Milliseconds

Since the new Date() function needs to be supplied with a milliseconds value, we need to first convert our given Unix timestamp to milliseconds. We can do this by simply multiplying the Unix timestamp by 1000 .

Unix time is the number of seconds that have elapsed since the Unix epoch, which is the time 00:00:00 UTC on 1 January 1970 . It’s most commonly used to create a running total of seconds when interacting with computers.

Therefore, a Unix timestamp is simply the number of seconds between a specific date and the original Unix Epoch date.

Measuring time using Unix timestamps is particularly useful because it is the same for everyone around the globe at all times since they don’t observe timezones. This can be very useful for dealing with dated information on both the server and client-side of applications.

So, let’s write some code to convert a Unix timestamp to milliseconds:

Feel free to substitute your own Unix timestamp in the code above.

In the next section, we’ll put to use that milliseconds value we just created.

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