'Language Locale Codes: Is BCP 47 being adopted now?

My curiosity is from the underscores vs hyphens (en-GB Vs en_GB) being used for the locale codes.

  • Is BCP 47 the standard widely considered this?
  • I see underscores being used more often. However, I do see a shift towards hyphens.
    • Java 7 uses underscores.
    • However, Java 8 uses hyphens.
    • iOS and Android use underscores. Should we expect a shift to hyphens in iOS and Android in the future? Maybe the answer is 'yes' for Android as it's tied to Java.
javaandroidioslocalizationlocale


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