Do you know that Java developer Google for even simplest of things? Yes, that's true and I can say it because even I do that:-). The current timestamp value is one of them. In UNIX you can just use the date command to get the current date and time but how do you get that in your Java program? Well, you can get the current timestamp in Java by using Date and Timestamp class of JDK. Note, there is 's' instead of 'S' in. Since Date in Java contains both date and time, it can be used as Timestamp value as well but when you print Date, it shows time in the.
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If you need just the timestamp, then you need to convert the java.util.Date to java.sql.Timestamp. You can convert a Date to Timestamp by using the getTime method which returns the number of millisecond from the Epoch.You should also remember that Timestamp is a subclass of java.util.Date but doesn't honor Liskov substitution principle, which means you cannot pass a Timestamp when Date is expected. Because it also includes additional nanosecond value which is fitted there to confirm database DATETIME value, which supports nanosecond precision. You can also read my post in Java for more details.Btw, In Java 8, you can also use the LocalDateTime class to get the current timestamp in Java.
In this article, I'll show you a couple of ways to get the current timestamp value. If you are interested to learn more about new features of Java SE 8 including Date and Time API, lambda expressions, streams, and other small enhancement e.g.
Joining String using String.join methods, please see By Cay S. Horstmann.Current Timestamp in JavaHere is a sample code snippet you can use to retrieve the current timestamp value using java.util.Date class and java.sql.Timestamp in Java. Remember the java.util.Date class is named Date, but.
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It contains both date and time value, unlike class of Java 8, which only contains Date information without any time details. There is a separate class LocalTime for representing time without date and to represent date with time.On the other hand, java.sql.Timestamp is a subclass of Date but has additional nanosecond value for more precision and be compatible with DATETIME type of many relational database e.g.
SQL Server, MySQL, and Oracle.Anyway, here is our code prior to Java 8 world:Date now = new java.util. Date;Timestamp current = new java.sql.Timestamp(now. GetTime);System.out.println( 'current timestamp: ' + current);System.out.println( 'current date: ' + now);Outputcurrent timestamp: 2016 -06 -16 17:33:14.53current date: Thu Jun 16 17:33:14 SGT 2016If you run this program, it will print the current date and time value, just try that before you read further. Btw, if you want your current timestamp into a different String format e.g. 'yyyy.MM.dd.HH.mm.ss' then you need to use the class to format the timestamp as shown below:String timeStamp = new SimpleDateFormat( 'yyyy.MM.dd.HH.mm.ss'). Format(current);System.out.println( 'current timestamp as yyyy.MM.dd.HH.mm.ss ' + timeStamp);Outputcurrent timestamp as yyyy.MM.dd.HH.mm.ss 2016.06.16.17.41.19You can format the date to any way you want, just be aware of the syntax used for formatting dates in Java as shown. Btw, these are not the only way to get the current timestamp value, for example, if you just need long milliseconds from the 1st January 1970 then you can use the System.currentTimeMillis which return millisecond from Epoch and System.nanoTime which return the current timestamp value in nanoseconds.You can also read a good Java book e.g.
Horstmann to learn more about fundamentals of Java e.g. Date, time, and calendar class in Java.
It even covers Java SE 8 new Date and Time API, which is just a bonus.
Is a programming language and computing platform first released by Sun Microsystems in 1995. There are lots of applications and websites that will not work unless you have installed, and more are created every day.was developed by Sun microsystem as an Object oriented language for general purpose business applications. The target of is to write a program once and then run this program on multiple operating systems.The first publicly available version of ( 1.0) was released in ‘95. Sun Microsystems was acquired by the Oracle Corporation in 2k10. Oracle has now the steermanship for. In 2k06 Sun started to make accessible under the GNU General Public License (GPL). Oracle continued this plan called Open JDK.Over time new improved versions of have been released.
Get Timestamp Of A File In Java Free![]() How To Get Last Modified File Name In Java
The present version of is 1.9 which is also known as 9.is defined by a specification and consists of a programming language, a compiler, core libraries and a runtime ( virtual machine) The runtime permit software developers to write program code in other languages than the programming language which still runs on the virtual machine. The platform is usually associated with the virtual machine and the core libraries.The syntax is similar to C. Is case-sensitive, e.g., variables called myValue andmyvalue are treated as different variables.Basic topics Covered in java isINDEX:.
JavaScript works with the number of milliseconds since the epoch whereas most other languages work with the seconds. You could work with milliseconds but as soon as you pass a value to say PHP, the PHP native functions will probably fail. So to be sure I always use the seconds, not milliseconds.This will give you a Unix timestamp (in seconds): var unix = Math.round(+new Date/1000);This will give you the milliseconds since the epoch (not Unix timestamp): var milliseconds = new Date.getTime. While microtime is present, most time related functions in php expect the timestamp to be in seconds and not milliseconds. What's more is that microtime returns a float (if you pass true) where the decimal part is the fractions of a second (accurate to the microsecond), while newDate.getTime returns an int where it just counts milliseconds since the epoch. For example (php) if you were to call floor(microtime(true)) this would be effectively the same as calling time which is in seconds and not micro or milliseconds. Dividing by 1000 as above is the easiest solution to this.–May 2 '12 at 21:32.
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I am trying to append a file name with time stamp so that every file will have a unique file name. I tried as below:String outFileName = outDir + ' + (new java.sql.Date(today.getTime)) + '.txt';This works fine as the file name gets appended with 2008-04-07.txt Now I want to add timestamp with it to make it unique.
I tried as below:new java.sql.Timestamp(System.currentTimeMillis); It is throwing error.When I try to print the above piece of code, it prints as below:2008-04-07 10:45:19.942 But it is not allowing me to write a file as with that name filename2008-04-07 10:48:05.083.txt (The parameter is incorrect) Is it due to the gap between date and time stamp. How do I overcome this?
Originally posted by John Todd:Yes but Timestamp class contains the nano second part which java.util.Date doesn't handle it.When I'm trying to display the converted Date object (according to my previous posted code), I got:date info. 00:00:00.Obviously, I lost the time.When you convert from timestamp to date, time will not be lost. The problem might be when you get date from database it might truncate time.see the below eg:the long value of timestamp, util.date, sql.date will be same. Only when it is printed it will be printed in different way. But you are converting into util.date so will not loose time only nano sec.
Will not comeTimestamp st = new Timestamp(System.currentTimeMillis);java.util.Date date1 = new java.util.Date(st.getTime);java.sql.Date date2 = new java.sql.Date(st.getTime);System.out.println(st); print date,Time, nano secSystem.out.println(date1); print date, timeSystem.out.println(date2); print date.
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