Timezone updates happen on almost a monthly basis, your computer has a file called the Timezone database which is maintained by a few volunteers. All timezone u

Timezone updates happen on almost a monthly basis, your computer has a file called the Timezone database which is maintained by a few volunteers. All timezone updates go through there and unless the application you wrote is written by someone who thinks they can do better than everyone involved in time-handling code so far, your application will stop using DST once the EU decides to stop using DST.