Croatia is obligated to switch from its current currency, the kuna, and begin using the euro as a consequence of its membership in the European Union. It was initially expected that Croatia would transition in 2019. At that time several criteria for entering the eurozone were not yet met, so the expected entry date was pushed back.
When will Croatia adopt the euro?
This question will resolve as the date Croatia adopts the euro as its sole official currency. This information will be published by the European Union. It will also be reported in reputable media such as The Economist, Reuters, and Bloomberg. The question resolves ambiguously if Croatia is no longer a part of the EU or if the euro stops existing by that time.