获取或设置上次访问当前文件或目录的时间，其格式为协调通用时间(utc)。

Gets or sets the time, in coordinated universal time (UTC), that the current file or directory was last accessed.

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此信息建立在自从协调通用时间(utc)(以前称为格林尼治标准时间)1970年1月1日00：00：00 . 000以来的毫秒数的基础上。

This information is based on the number of milliseconds since January 1, 1970, 00:00:00.000 Coordinated Universal Time (UTC), formerly known as Greenwich Mean Time.

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