Epoch & Unix Timestamp Converter

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The bug appears whenever we try to convert an XMLGregorianCalendar instance to a java. Current Unix epoch time. It's more than this solution.

When constructing a value by its constituent fields, the factory is called of; when converting from another type, the factory is called from. JAXB allows Java developers to map to XML representations. You can change the timezone so it is undefined.

Epoch & Unix Timestamp Converter

Java SE 8 Date and Time by Ben Evans and Richard Warburton Why do we need a new date and time library? A long-standing bugbear of Java developers has been the inadequate support for the date and time use cases of ordinary developers. For example, the existing classes such as java. Some of the date and time classes also exhibit quite poor API design. For example, years in java. Date start at 1900, months start at 1, and days start at 0—not very intuitive. These issues, and several others, have led to the popularity of third-party date and time libraries, such as Joda-Time. In order to address these problems and provide better support in the JDK core, a new date and time API, which is free of these problems, has been designed for Java SE 8. The project has been led jointly by the author of Joda-Time Stephen Colebourne and Oracle, under JSR 310, and will appear in the new Java SE 8 package java. This puts the burden on developers to use them in a thread-safe manner and to think about concurrency problems in their day-to-day development of date-handling code. The new API avoids this issue by ensuring that all its core classes are immutable and represent well-defined values. The new API models its domain very precisely with classes that represent different use cases for Date and Time closely. This differs from previous Java libraries that were quite poor in that regard. Date represents an instant on the timeline—a wrapper around the number of milli-seconds since the UNIX epoch—but if you call toString , the result suggests that it has a time zone, causing confusion among developers. It does so without imposing additional burden on the majority of developers, who need to work only with the standard chronology. LocalDate and LocalTime The first classes you will probably encounter when using the new API are LocalDate and LocalTime. They are local in the sense that they represent date and time from the context of the observer, such as a calendar on a desk or a clock on your wall. There is also a composite class called LocalDateTime, which is a pairing of LocalDate and LocalTime. A desktop JavaFX application might be one of those times. These classes can even be used for representing time on a distributed system that has consistent time zones. Creating Objects All the core classes in the new API are constructed by fluent factory methods. When constructing a value by its constituent fields, the factory is called of; when converting from another type, the factory is called from. There are also parse methods that take strings as parameters. Because all core classes are immutable in the new API, these methods are called with and return new objects, rather than using setters see Listing 3. There are also methods for calculations based on the different fields. WEEKS ; Listing 3 The new API also has the concept of an adjuster—a block of code that can be used to wrap up common processing logic. You can either write a WithAdjuster, which is used to set one or more fields, or a PlusAdjuster, which is used to add or subtract some fields. Value classes can also act as adjusters, in which case they update the values of the fields they represent. Built-in adjusters are defined by the new API, but you can write your own adjusters if you have specific business logic that you wish to reuse. The truncatedTo method exists to support such use cases, and it allows you to truncate a value to a field, as shown in Listing 5. SECONDS ; Listing 5 Time Zones The local classes that we looked at previously abstract away the complexity introduced by time zones. A time zone is a set of rules, corresponding to a region in which the standard time is the same. There are about 40 of them. Time zones are defined by their offset from Coordinated Universal Time UTC. They move roughly in sync, but by a specified difference. Each ZoneId corresponds to some rules that define the time zone for that location. This can be resolved for a specific ZoneId at a specific moment in time, as shown in Listing 7. This can resolve an offset at any point in time. The rule of thumb is that if you want to represent a date and time without relying on the context of a specific server, you should use ZonedDateTime. This is useful for serializing data into a database and also should be used as the serialization format for logging time stamps if you have servers in different time zones. DAYS ; Listing 10 Java SE 8 will ship with a new date and time API in java. The new API models the domain well, with a good selection of classes for modeling a wide variety of developer use cases. Durations A Duration is a distance on the timeline measured in terms of time, and it fulfills a similar purpose to Period, but with different precision, as shown in Listing 11. Chronologies In order to support the needs of developers using non-ISO calendaring systems, Java SE 8 introduces the concept of a Chronology, which represents a calendaring system and acts as a factory for time points within the calendaring system. Learn More The Rest of the API Java SE 8 also has classes for some other common use cases. There is the MonthDay class, which contains a pair of Month and Day and is useful for representing birthdays. The YearMonth class covers the credit card start date and expiration date use cases and scenarios in which people have a date with no specified day. JDBC in Java SE 8 will support these new types, but there will be no public JDBC API changes. The existing generic setObject and getObject methods will be sufficient. These types can be mapped to vendor-specific database types or ANSI SQL types; for example, the ANSI mapping looks like Table 1. ANSI SQL Java SE 8 DATE LocalDate TIME LocalTime TIMESTAMP LocalDateTime TIME WITH TIMEZONE OffsetTime TIMESTAMP WITH TIMEZONE OffsetDateTime Table 1 Conclusion Java SE 8 will ship with a new date and time API in java. The new API models the domain well, with a good selection of classes for modeling a wide variety of developer use cases. Richard Warburton is an empirical technologist and solver of deep-dive technical problems. Most recently, he has been working on data analytics for high-performance computing at jClarity.

They move roughly in sync, but by a specified difference. I need to do this because I jesus to compare dates in my code. Move Your Career Forward with certification training in the latest technologies. Create a new instance of GregorianCalendar and just set the corresponding fields with values from XMLGregorianCalendar instance. Hi, I also encountered this problem, and this is what I have found: 1. LocalDate and LocalTime The first custodes you will probably encounter when using the new API are LocalDate and LocalTime.