'Whats wrong with my date/timezone using this DateUtil?

I never seem to have the value that I am expecting. I want to pass in a timezone and get the correct time back and it never seems quite right. What am I doing wrong here?

 long timezoneOffset = DateUtil.getTimeZoneOffset(aTimezone);   
        Calendar rangeStart = DateUtil.getCalendarByMillisInTimezone(event.getStartDate().getTimeInMillis() -timezoneOffset , timezone);

Calendar rangeEnd = DateUtil.getCalendarByMillisInTimezone(event.getEndDate().getTimeInMillis()-timezoneOffset,  timezone);
javadatetimeoffset


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