Be wary of the default locale
Tuesday, August 21, 2012, Modified: Refs
Note that there are many convenience methods that automatically use the default locale, but using them may lead to subtle bugs.

The default locale is appropriate for tasks that involve presenting data to the user. In this case, you want to use the user's date/time formats, number formats, rules for conversion to lowercase, and so on. In this case, it's safe to use the convenience methods.

The default locale is not appropriate for machine-readable output. The best choice there is usually Locale.US – this locale is guaranteed to be available on all devices, and the fact that it has no surprising special cases and is frequently used (especially for computer-computer communication) means that it tends to be the most efficient choice too.

... https://developer.android.com/reference/java/util/Locale.html#default_locale

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