Last year Twitter introduced a"night mode" where users are given an option to manually replace a big white background to a big dark background to make extended reading at night without hurting their eyes.
And now in a major update, the app itself has the ability to turn on the feature accordingly. The latest version of the Android Twitter app, 7.2, automatically turns "night mode" on after dark.
But users can still set this feature on and off by manual toggle, but when it is set to automatic mode, the app will turn "night mode" on at sunset and off at sunrise. And it seems like the dark theme for the app has been ditched for this update. The feature is live on Android as of the Twitter app's version 7.2, released today, but that feature hasn't reached iOS yet.