Obtains an instance of {@code ZoneId} wrapping an offset.
!(p)
If the prefix is "GMT", "UTC", or "UT" a {@code ZoneId}
with the prefix and the non-zero offset is returned.
If the prefix is empty {@code ""} the {@code ZoneOffset} is returned.
@param prefix the time-zone ID, not null
@param offset the offset, not null
@return the zone ID, not null
@throws IllegalArgumentException if the prefix is not one of
"GMT", "UTC", or "UT", or ""
Obtains an instance of {@code ZoneId} wrapping an offset. !(p) If the prefix is "GMT", "UTC", or "UT" a {@code ZoneId} with the prefix and the non-zero offset is returned. If the prefix is empty {@code ""} the {@code ZoneOffset} is returned.
@param prefix the time-zone ID, not null @param offset the offset, not null @return the zone ID, not null @throws IllegalArgumentException if the prefix is not one of "GMT", "UTC", or "UT", or ""