Had to be appcelerators titanium (weirdly I think this app was built with it).

I used it in the early days, before they had the foresight to add a date-time picker for Android.

It was a horrible unforgiving place, bugs on top of bugs, horrible documentation, incorrect instructions, and hacky workarounds posted as official installation instructions.

I'm not sure if it's gotten any better now, but I did give it a go again 2 years to update an app for someone. They made so many breaking changes, which is fine, but the new outcome offered less features and required more boilerplate code. I then spent (literally) 3 hours trying to get the Android simulator to run the app. Titanium just kept timing out and throwing incomprehensible errors. I eventually gave up and told my friend I updated it, it compiles but I can't test it.

Will never touch it again, and will never be used in any team I work for. Just awful.