如果只指定From日期，时间范围从指定的日期开始，一直延续到当前日期。

When only specifying a From date, the time range will begin on the date specified and continue to the current date.

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一个数据库选项，用来指定日期维度表在初次启动被创建时预填充的天数(从当前日期开始)。

A database option that specifies the number of days (starting from the current date) to pre-populate in the date dimension table when it creates it on first startup.

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d选项还可以告诉您，相对于当前日期若干天的究竟是哪一天，从现在开始的若干天或若干星期以后，或者以前(过去)。

The -d option can also tell you what the date will be relative to the current date — either a number of days or weeks from now, or before now (ago).

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