关于Cron表达式中的周一至周五正确的配置

前言：最近有个业务需求，需要做一个任务调度，其核心之一就是Cron表达式。

需求：做一个计划，由计划内容生成任务，要求在周一至周五08:00点生成任务。

表达式：0 0 8 ? * 1,2,3,4,5 *  （错误的）

错误现象：明明设置的是周一至周五生成，但是却在周天生成了，而周五却没有生成。

翻找源码发现：标准时间前后差一天。

正确表达式：0 0 8 ? * 2,3,4,5,6 *

/**
     * Value of the {@link #DAY_OF_WEEK} field indicating
     * Sunday.
     */
    public final static int SUNDAY = 1;


    /**
     * Value of the {@link #DAY_OF_WEEK} field indicating
     * Monday.
     */
    public final static int MONDAY = 2;


    /**
     * Value of the {@link #DAY_OF_WEEK} field indicating
     * Tuesday.
     */
    public final static int TUESDAY = 3;


    /**
     * Value of the {@link #DAY_OF_WEEK} field indicating
     * Wednesday.
     */
    public final static int WEDNESDAY = 4;


    /**
     * Value of the {@link #DAY_OF_WEEK} field indicating
     * Thursday.
     */
    public final static int THURSDAY = 5;


    /**
     * Value of the {@link #DAY_OF_WEEK} field indicating
     * Friday.
     */
    public final static int FRIDAY = 6;


    /**
     * Value of the {@link #DAY_OF_WEEK} field indicating
     * Saturday.
     */
    public final static int SATURDAY = 7;