findAndroidTimezoneID

Find the best matching Android (= available in system and Java timezone registry) time zone ID for a given arbitrary time zone ID:

Use a case-insensitive match ("EUROPE/VIENNA" will return "Europe/Vienna", assuming "Europe/Vienna") is available in Android.
Find partial matches (case-sensitive) in both directions, so both "Vienna" and "MyClient: Europe/Vienna" will return "Europe/Vienna". This shouln't be case-insensitive, because that would for instance return "EST" for "Westeuropäische Sommerzeit".
If nothing can be found or tzID is null, return the system default time zone.

best matching Android time zone ID

tzID

time zone ID to be converted into Android time zone ID