public void setOccurrenceDays(java.util.Collection<Integer> occurrenceDays) {
        if (occurrenceDays == null) {
            this.occurrenceDays = null;
            return;
        }

        this.occurrenceDays = new com.amazonaws.internal.SdkInternalList<Integer>(occurrenceDays);
    }
<p>
The days. For a monthly schedule, this is one or more days of the month (1-31). For a weekly schedule, this is
one or more days of the week (1-7, where 1 is Sunday). You can't specify this value with a daily schedule. If the
occurrence is relative to the end of the month, you can specify only a single day.
</p>

@param occurrenceDays
       The days. For a monthly schedule, this is one or more days of the month (1-31). For a weekly schedule,
       this is one or more days of the week (1-7, where 1 is Sunday). You can't specify this value with a daily
       schedule. If the occurrence is relative to the end of the month, you can specify only a single day.
aws-java-sdk-ec2/src/main/java/com/amazonaws/services/ec2/model/ScheduledInstanceRecurrenceRequest.java