The "Time" marker simply represents a line between the LocalDate and LocalTime parts of the format. You would typically do this to show the result to the end user in string format, while performing operations on the LocalDateTime object beforehand.
Depending on the project you're working on you might need to handle different time zones when dealing with dates and time.
Sometimes, we could wish to use our own custom formatter, that accepts a string in the most varied ways and still not throw a DateTimeParseException. Check out our hands-on, practical guide to learning Git, with best-practices, industry-accepted standards, and included cheat sheet. Stop Googling Git commands and actually learn it! All weeks between the first and last weeks inclusive have the same week year value. Therefore, the first and last days of a week year may have different calendar year values.
Note: K and H differ the same way k and h differ. H and h refer to the and model respectively, while K and k refer to the and respectively.
If this still doesn't satisfy your need for a custom formatter, you can use DateTimeFormatterBuilder to build very specific and complex formatters. Amongst other things, DateTimeFormatter is built using this class. This is an older approach, which isn't used often today, but it's still worth covering since sometimes we still use the classes from these APIs:.
There are many patterns that we can pass into the constructor of SimpleDateFormat. You can combine pretty much any number of formats using the available patterns. It's not possible to set a timezone for a Date, because it simply doesn't contain such information. However, it's easy to format the date and add the timezone information to a String:. Reading this article, it's fair to raise the question - " What is the difference, and which one should I be using? It's thread-safe unlike its older counterpart and offers new functionality:.
It's clear to see the difference between these two. In the older way, a formatter is used to format and then parse the date. In the newer way, dates have their own format and parse methods and use a DateTimeFormatter simply for the pattern.
If you're using Java 8 and the new API, use DateTimeFormatter, whereas if you're still using an older version of Java, use SimpleDateFormat. Joda-Time was developed to counter the problems with the old Java time and date classes. As of Java 8, these problems have been corrected, and Joda-Time has served its purpose.
Even the authors of it advise migrating to official java. time to work with dates and time. In the case that this is impossible, and for those who still use a version of Java prior to Java 8, Joda-Time is still a great library to use.
A dependency for this library can easily be added with a Maven dependency:. For a full list of time zone IDs available for use, visit the official docs. Apache Commons is a useful library used in many projects.
Both of the implementations below accept an array of patterns. These methods will parse each pattern after another. If no pattern matches the input string, a ParseException is thrown. We've covered multiple ways to convert a simple String into Date and Date-Time classes in Java. Some of these approaches utilize third-party libraries which you might already have in your project, and some are done utilizing the APIs Java offers.
Get tutorials, guides, and dev jobs in your inbox. No spam ever. Unsubscribe at any time. 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.
These examples are showing how to get current date and time that could be presented to the end-user. These examples are showing how to convert timestamp - either in milliseconds or seconds to human readable form. These examples are showing how to parse date in human readable form to unix timestamp in either milliseconds or seconds. 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 Coordinated Universal Time UTC , Thursday, 1 January , not counting leap seconds.
Find centralized, trusted content and collaborate around the technologies you use most. Connect and share knowledge within a single location that is structured and easy to search. I have date like Tue Mar 19 GMT , how to convert it to ? Use two SimpleDateFormat objects with appropriate formats and use the first to parse the string into a date and the second to format the date into a string again. Then use that to format the resulting date object with another instance of SimpleDateFormat like this:.
See the javadoc of SimpleDateFormat here. Hope that helps. One major thing that the others have left out is dealing with the timezone TZ. Unless you only deal with date strings in the default timezone, you'll run into problems. Your input date is representing a date in GMT. Assuming that you also want the output to be formatted as GMT, you need to make sure to set the TZ on the SimpleDateFormat:.
Use SimpleDateFormat in this way:. If you do any calculations or parsing with dates please use JodaTime because the standard JAVA date support is really buggy. Stack Overflow for Teams — Start collaborating and sharing organizational knowledge. Create a free Team Why Teams? Learn more about Collectives. Learn more about Teams. Date converter in JAVA [duplicate] Ask Question. Asked 9 years, 6 months ago.
Modified 9 years, 6 months ago. Viewed 4k times. java date. Improve this question. edited Mar 19, at asked Mar 19, at Have you tried anything? You start by searching StackOverflow for one of the millionth posts about date conversions in Java. evening: Well why not fix the question so that the times are right?
You're asking for people's help here - the least you can do is make sure you ask a sensible question. evening: Okay, that's better. Now why would you expect a formatter with a format of "yyyy-MM-dd HH:mm:ss" to be able to parse a value of "Tue Mar 19 GMT "?
Show 3 more comments. Sorted by: Reset to default. Highest score default Trending recent votes count more Date modified newest first Date created oldest first.
Improve this answer. answered Mar 19, at Ridcully Ridcully Add a comment. As the first answer says. format from ; See the javadoc of SimpleDateFormat here. Sten Roger Sandvik Sten Roger Sandvik 2, 2 2 gold badges 19 19 silver badges 15 15 bronze badges. JUst one thing left, how to convert string to date? String to date is the first line. Just use parse on SimpleDateFormat. One of many reasons to use Joda instead sdf. setTimeZone TimeZone. applyPattern "yyyy-MM-dd HH:mm:ss" ; System. println sdf.
format date ; }. Blake Blake 3 3 silver badges 14 14 bronze badges. println formatter. format date ;. Igor Rodriguez Igor Rodriguez 1, 13 13 silver badges 16 16 bronze badges. How to convert formatter. format date to date? evening: with formatter. parse String , giving it a string in the same format. parse formatter. format date ; System. evening: Yes, they are inverse operations.
evening: Date class stores the date as a long value, but when you print it, it displays it in a readable format, that is: "Tue Mar 19 GMT ". You don't need to do anything with that format until you decide to display it to the user.
In that moment need to format that date to the way you would like to display it, and you do it with the SimpleDateFormat, that returns a String in the format you specified, in your case " " using the posted pattern. Show 2 more comments. emd emd 4 4 silver badges 12 12 bronze badges. Is an awful implementation, but I don't know those bugs. stenrs: JSR is still in development as i know and it will replace the data api in JAVA 8.
Stephen Colebourne created JodaTime and is developing JSR — emd. emd: Also, it's this one: github. stenrs - you're right — emd. Not the answer you're looking for? Browse other questions tagged java date or ask your own question. The Overflow Blog. Why the number input is the worst input. Hypergrowth headaches Ep. Planned maintenance scheduled for Wednesday, 21 September, UTC Recent Color Contrast Changes and Accessibility Updates.
The [option] tag is being burninated. Should I explain other people's code-only answers? Reviewer overboard! Or a request to improve the onboarding guidance for new Linked Related Hot Network Questions. Accept all cookies Customize settings.
sort in Java with Examples Initializing a List in Java Multithreading in Java Math pow method in Java with Example Polymorphism in Java PriorityQueue in Java How to determine length or size of an Array in Java? What's New. If you're using Java 8 and the new API, use DateTimeFormatter, whereas if you're still using an older version of Java, use SimpleDateFormat. Generic footer banner. Java Type Conversion Examples. ADVANCED DSA.Timestamp Online is timestamp converver between unix timestamp and human readable form date. Instant class in java. Reviewer overboard! LocalDateTime :. emd: Also, it's this one: github. Generic footer banner.