How to convert timestamp to date

Timestamp

Timestamp to Date Converter

Date to Timestamp Converter

Current Unix Timestamp

Random Unix Timestamp

Answers to Questions (FAQ)

What is a timestamp? (Definition)

How to calculate a timestamp?

A is calculated from the initial date. By default, each second after this date increments the with 1 unit.

The most popular is January 1, 1970 for Unix operating systems, Java programming languages, PHP, C ++, etc.

is January 6, 1980 for GPS (first Sunday of the year 1980)

Example: January 1, 2000 corresponds to 946681200 seconds after January 1, 1970 ( Unix)

Some timestamps are more accurate than the second, each increment (called tick) can be of the order of milliseconds, microseconds or nanoseconds.

How to use a timestamp?

A allows comparison of two dates in an fast, exact and sure way. Indeed, with daylight saving time change, sometimes a 2h59 in the morning plus one minute, suddenly it is 2h00, the comparison of times is therefore difficult.

How to convert a timestamp?

dCode’s converter allows to convert automatically by calculating exact days, months, years, hours, minutes and seconds (depending on the time zone).

How to convert a Date into a Unix Timestamp in Excel?

The dates in Excel have their own (January 0, 1900), the trick is to remove the one from Unix.

Example: For a date in cell A1: =(A1-DATE(1970,1,1))*86400

How to convert a Unix Timestamp into a Date in Excel?

The converting trick is to add the date of Unix/Linux =A1/86400+DATE(1970,1,1)

Why Epoch Unix is 1970-01-01?

January 1st, 1970 00:00 UTC is the start of UNIX era.

Windows systems (32 and 64 bits) use January 1st, 1601

What is going to happen on the january 19th, 2038?

On the 19/01/2038 at 03:14:07, the number of seconds since Unix will be 2147483647 seconds: 2^31-1, this is the size limit for 32bits systems. There will be a bug on the next second when calculating dates on these systems and all future dates will be considered in the past by the system.

Source code

dCode retains ownership of the «Timestamp» source code. Except explicit open source licence (indicated Creative Commons / free), the «Timestamp» algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or the «Timestamp» functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and all data download, script, or API access for «Timestamp» are not public, same for offline use on PC, mobile, tablet, iPhone or Android app!
Reminder : dCode is free to use.

TimeStamp to Date in Java

Introduction to TimeStamp to Date in Java

In Java timestamp is defined as a sequence for providing formatted or encoded data whenever any event occurs such as displaying date and time of day where this timestamp class can be converted to date class in java using Java.util library which needs to be imported when dealing with a timestamp in Java. In general, the timestamp is converted to date using the date class of Java.util class for displaying the SQL timestamp that contains both date and time value and there are several ways to convert timestamp to date where this timestamp can be obtained by using java.util.Date which belongs to java.util library.

Syntax of TimeStamp to Date in Java

There are 3 different ways to convert timestamp to date in java. Let us see the syntax of these different methods separately.

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Timestamp t = new Timestamp();
Date d = t;

Timestamp t = new Timestamp();
Calendar c = Calendar.getInstance();
Calendar.getTime();

How to Convert Timestamp to Date in Java?

In Java, the timestamp is defined as the time and the date format that is displayed using timestamp class which is done using java.util class for using date and calendar class whereas there is java.sql package for using timestamp class in java to implement timestamp in the java program. The conversion of the timestamp to date would result in displaying both date and time in milliseconds which is usually a human-readable format. Therefore exact working of the timestamp to date conversion is done using 3 different ways and is done using timestamp class using java.util or java.sql package.

1. Using Constructor

In Java, there is java.util.Date class which is provided by the java.util package and we will be using the constructor of this class to convert timestamp to date. The working of this method of conversion is firstly it will obtain the value which is long value as a parameter from the Date class constructor where it results in timestamp object which will convert long value using getTime() method

Example

import java.sql.Timestamp;
import java.util.Date;
public class TimestampToDate
<
public static void main(String args[])
<
Timestamp t = new Timestamp(System.currentTimeMillis());
Date d = new Date(t.getTime());
System.out.println(» Demonstration of timestamp to date conversion using date constructor : «);
System.out.println(» \n «);
System.out.println( d );
>
>

Output:

In the above example, we can see that we have first imported java.sql, Timestamp package, and java.util.Date package for using date constructor we need Date class and to use timestamp we use Timestamp class. Therefore, firstly we define and declare a variable “t” which belongs to the Timestamp class and we define it using “new” and we pass the currentTimeMills() function to display the timestamp which is later converted to date. Then we declare the Date variable of the Date class “d” which is defined using “new” where we are passing the getTime() function to convert the above timestamp into date format. Then using println we will display the converted date from the obtained timestamp. The output of the above program is as shown in the above screenshot.

2. Using Date References

This is another method of converting timestamp to date in Java using again the date class of java.util.date package. In this method, it just extends the date class where the timestamp instance is assigned to date directly and therefore the date object which results as output in the date format which was earlier in the timestamp. Let us see an example below for demonstrating such method in java:

Example

import java.sql.Timestamp;
import java.util.Date;
public class TimestampToDate
<
public static void main(String args[])
<
Timestamp t = new Timestamp(System.currentTimeMillis());
Date d = t;
System.out.println(» Demonstration of timestamp to date conversion using date reference : «);
System.out.println(» \n «);
System.out.println( d );
>
>

Output:

In the above example, we can see it similar to the previous example but the only difference in the above program and this program is that instead of defining the date class here it will directly assign the timestamp instance “t” to date object “d”, here we do not use getTime() function as we are directly assigning the date object to timestamp instance and therefore here the output will look similar to timestamp but it is date format with time also including milliseconds. This can be seen in the above screenshot.

3. Using Calendar Class

Another method of converting timestamp to date in java is using calendar class which is rarely used by any developers. We can obtain calendar class by the java.util.Calendar package where we use this calendar class along with which we have to use getInstance() function to get timestamp instance and getTime() to get the date along with time which will be converted from the timestamp. Let us see an example below:

Example

import java.sql.Timestamp;
import java.util.Date;
import java.util.Calendar;
public class TimestampToDate
<
public static void main(String args[])
<
Timestamp t = new Timestamp(System.currentTimeMillis());
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(t.getTime());
System.out.println(» Demonstration of timestamp to date conversion using Calendar class : «);
System.out.println(» \n «);
System.out.println(calendar.getTime());
>
>

Output:

In the above example, we can see we have imported Calendar class also from java.util.Calendar package and this example are similar to the first example where we used date class. In this example, we define the calendar instance by using the getInstance() function which will be in the timestamp format later by using getTime() the timestamp instance is converted to a date object which results as shown in the output in the above screenshot.

Conclusion

In this article, we conclude that the timestamp to date conversion in java is very simple. In Java, there is java.util package which provides different classes for supporting this conversion in various ways with different classes. It depends on the user on which method to use according to the user’s requirement and time accuracy which displays the result accurately as required.

Recommended Articles

This is a guide to TimeStamp to Date in Java. Here we also discuss the introduction and how to convert timestamp to date in java along with examples. You may also have a look at the following articles to learn more –

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Convert UNIX Time to normal Date Time format

Form for Unix timestamp conversion

Do you find this tool useful? Then share it with your friends or colleagues. This will help us to make our free web tools better.

This form allows you to Convert UNIX timestamp to Date Time:

Result of converting UNIX Time to Date Time

About converting Unix timestamp to DateTime

What is the unix time stamp?

The UNIX timestamp is a way to track time as a running total of seconds. This count starts at the Unix Epoch on January 1st, 1970 at UTC. Therefore, the unix time stamp is merely the number of seconds between a particular date and the Unix Epoch. It should also be pointed out that this point in time technically does not change no matter where you are located on the globe. This is very useful to computer systems for tracking and sorting dated information in dynamic and distributed applications both online and client side.

About this tool

Most databases store the date in Unix format so Convert Unix Timestamp To DateTime tool was created to help with converting time.

How it Works?

Just paste your Unix Time to the input above, select your format of Date/Time, select your time zone and click to the button «Convert» and you will get Date and time in your format with your time zone.

What is Format?

The following characters are recognized in the format parameter string:

Java Program to Convert TimeStamp to Date

Date Time class is used to display date and time and manipulate date and time in java and in addition to this it is also used for formatting date and time class in java across time zone associated data. So in order to import this class from a package called java.utils

Timestamp class can be converted to Date class in java using the Date class which is present in Java.Util package. The constructor of the Date class receives a long value as an argument. Since the constructor of the Date class requires a long value, we need to convert the Timestamp object into a long value using the getTime() method of the TimeStamp class(present in SQL package).

In order to import date class syntax is as follows: import java.util.Date ;

After importing this class one can create an object of the Date class in order to print the current date and time. Now in order to print the default date and time simply call the print command using toString() method to get the current date and time

Note: In order to print no of milliseconds till now simply use getTime() instead of to String() to get no of milliseconds till the program is being executed. Also, remember 01-01-1970 is the base reference also referred to as Epoch time.

Methods: There are 3 ways to do so as listed below:

Implementation: Describing approaches with the help of java program individually:

Method 1: Timestamp to Date Using Date constructor

Timestamp to Date in SQL

Introduction to Timestamp to Date in SQL

In SQL, timestamp is a function which is used to retrieve the current date and time of the SQL server without the database timezone offset. In SQL, CURRENT_TIMESTAMP is used to extract the current date and time. It takes no argument and returns the datetime value. However, there is a need to retrieve, store, compare the 2 date and time values in practical situations and make decisions accordingly. So, it is important to convert the obtained timestamp in the format according to the requirements. There are various functions provided in the SQL languages which allow the user to handle the above situation.

How to Convert Timestamp to Date in SQL with Syntax

In SQL, a timestamp data type also exists, which has nothing to do with the date and time values. Instead, it exposes the uniquely generated binary numbers in the database whose value keeps on changing on any update/ insert in the database. Data type timestamp has been deprecated now. Instead, the row version is used nowadays to deal with such things.

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But, here, the CURRENT_TIMESTAMP function which retrieves the current date and time values. And to convert this timestamp in the required formats of date and time values. In addition, SQL provides CONVERT and CAST functions that the programmer can use to perform the desired conversion task.

1. CONVERT

CONVERT() function in SQL is used to convert any value of any data type into the required data types (as mentioned by the user in the query). To convert the current timestamp in the desired date and time values, required datatype, expression, and ‘code’ (used to define the required format of date and time to be obtained) is taken as a parameter.

Some of the codes are given below to give you an overview of the formats provided by them:

As seen above, in order to retrieve the current timestamp of the SQL server function which is used is:

CURRENT_TIMESTAMP;
(takes no arguments)

Syntax of the CONVERT function of the SQL server to convert the above timestamp:

convert(data_type(length), expr, code) ;

2. CAST

CAST() function performs the same way as CONVERT(), i.e. it too converts the value of any data type in the desired data type. Thus, we can make use of this function to convert the retrieved current timestamp in the date and time values. Both the CONVERT and CAST function performs the same task, the only difference being that CAST() is a part of ANSI- SQL, whereas CONVERT() is not. But one advantage with the CONVERT() function is that it takes an extra parameter of ‘code’ in which we can style the date and time in ‘n’ number of formats simply by passing the style code as a parameter.

Syntax of the CAST function to convert the above timestamp value in the required date and time format:

cast (expr AS data_type(length);

Examples of Timestamp to Date in SQL

Given below are some of the examples showing the conversion of a timestamp to date and time in SQL along with their outputs:

Some examples of SQL queries showing conversion using the CONVERT function with different ‘code’ parameters:

Example #1

Code:

SELECT convert(varchar, CURRENT_TIMESTAMP,127) ;

Output:

Example #2

Code:

SELECT convert(varchar, CURRENT_TIMESTAMP,100) ;

Output:

Example #3

Code:

SELECT convert(varchar, CURRENT_TIMESTAMP,9) ;

Output:

Example #4

Code:

SELECT convert(varchar, CURRENT_TIMESTAMP,13) ;

Output:

Example #5

Code:

SELECT convert(varchar, CURRENT_TIMESTAMP,21) ;

Output:

Some examples of SQL queries showing the conversion using CAST function with different Time and Date data types of the SQL server:

Example #6

Code:

SELECT CAST(CURRENT_TIMESTAMP AS DATE);

Output:

Example #7

Code:

SELECT CAST(CURRENT_TIMESTAMP AS datetime2);

Output:

Example #8

Code:

SELECT CAST(CURRENT_TIMESTAMP AS DateTime);

Output:

Example #9

Code:

SELECT CAST(CURRENT_TIMESTAMP AS DateTimeOffset);

Output:

Example #10

Code:

SELECT CAST(CURRENT_TIMESTAMP AS Time);

Output:

Example #11

Code:

SELECT CAST(CURRENT_TIMESTAMP AS SmallDateTime);

Output:

Conclusion

The above description clearly explains how the timestamp function works in SQL and the practical implementation of the conversion of a timestamp to Date. Although for a DBA working on the SQL queries, there arise various scenarios when we want the data of date and time in the desired format, we cannot change the table schema every time to satisfy each requirement, so it is important to understand the conversion clearly in order to proceed further easily.

Recommended Articles

This is a guide to Timestamp to Date in SQL. Here we discuss the introduction, how to convert timestamp to date in SQL with syntax and examples. You may also have a look at the following articles to learn more –

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