A DESCRIPTION OF THE PROBLEM :
java.util.TimeZone and java.time.ZonedDateTime use old time zone abbreviations no longer available in the tzdata latest releases. IANA has switched to numeric abbreviations for some time zones in 2017a release ex:
Atlantic/Azores was changed from AZOST to +00
America/Sao_Paulo changed from BRT to -03

When using java.util.TimeZone.getDisplayName(false, TimeZone.SHORT) and ZonedDateTime.ofInstant(beginInstant, timeZone.toZoneId()) returns AZOST and BRT respectively instead of returning +00 and -03.


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Can be reproduced by using
TimeZone.getTimeZone("Atlantic/Azores").getDisplayName(false, TimeZone.SHORT);
ZonedDateTime.ofInstant(beginInstant, "Atlantic/Azores")

ACTUAL -
AZOST

FREQUENCY : always