系统通常只意识到当前的日期和时间，所以让计算机从当前日期中提取出出生日期来获得年龄值是一件微不足道的事。
The system is always aware of the current date and time, so it's a trivial thing for the computer to subtract a birth date from the current date to get an age value.
检查系统时钟；更重要的是，要检查编译树中文件的日期、系统中其他文件的日期以及系统的时钟。
Check your clock; more importantly, look at the dates of files in your build tree, and other files on your system, and your clock.
传统的基于数据的移植关注日期对象，在移植发生前与系统日期相比较。
The traditional date-based migration looks at the date objects, comparing to system date before a migration will take place.
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