Unlike GMT which is based on solar time and originally calculated a second as a fraction of the time it takes for the Earth to make a full rotation around its axis, UTC calculates a second as “the duration of 9192631770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom”.

UTC essentially appeared in 1960, GMT being the ‘main thing’ until then. How does this converter work? It compiles your kotlin code to java bytecode, next it uses jar fernflower to decompile bytecode to java.Literature and history are a bit ambiguous. If you have another reason, you can indicate it in a comment!

Another reason can be the case where we don't understand a piece of kotlin code, and we hope to understand it in java. We can also consider the fact that we want to remove Kotlin to keep only Java source code. For exemplet to integrate some feature in Java (instead of Kotlin), or to investigate a performance issue. Why convert Kotlin to Java? There can be different reasons for doing this conversion. The currently released version is 1.6.10 (published on December 14, 2021).

Is Kotlin hard? It is not a complicated language, it is inspired by existing languages such as C#, Groovy, Java, JavaScript and Scala. Native ? Kotlin/Native is a technology for compiling Kotlin code to native binaries which can run without a virtual machine! It is still in beta. When to use kotlin? Kotlin can be used for any kind of development, be it client-side (With JavaScript), server-side (JVM), Android, embedded systems (With Kotlin/Native), mobile applications. It has been developed under the Apache 2.0 license and perfected for more than 5 years by the company JetBrains. It is designed to interoperate fully with Java, but it also targets Android, JavaScript and Native.

This language is intended to be concise (Rough estimates indicate approximately a 40% cut in the number of lines of code) and 100% interoperable with the Java programming language. Kotlin is a general-purpose programming language with type inference.

Convert java to kotlin online