If the time and timezone are known, this method changes the timezone to the specified UTC offset, altering minutes, hours, day, month, and year as necessary to ensure that the actual described moment in time is the same.
It is an error to operate on instances without a time or timezone, or with a partially specified date.
@param tzSign the timezone offset sign, either +1, 0, or -1
@param tzHour the timezone offset hour
@param tzMinute the timezone offset minute
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