如果这两个值都没有指定，则采用数据库服务器的默认日期格式。
When neither of them are specified, the database server's default date format is assumed.
Create date列是创建数据库的日期，采用YYYY - MM - dd格式。
The create date column specifies the date when the database was created, with YYYY-MM-DD being the format.
默认情况下，数据库只跟踪最近修改文档的日期，但是通过选择Maintain LastAccessed property选项，数据库也可以跟踪最近读取文档的时间。
By default, databases only track when a document was last modified, but by selecting the Maintain LastAccessed property option, the database can also track when a document was last read.
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