code: public static String getChangeDateMinutePrior(String changeDateISO, int priorMinutes) {
  		return DateUtil.toISODateRealTimeFormat(DateUtil.getDatePriorToMinutes(
  				DateUtil.fromISODateTimeFormat(changeDateISO), priorMinutes));
  	}
docs: Generates and retrieves the change date that occurs a minute prior to the
  specified change date in ISO format.
  
  @param changeDateISO
  A given change date in ISO format
  @return The ISO-formatted date/time stamp for a minute prior to the given
  change date