多层系统开发，如何保持客户端与数据库或应用服务器时间同步是一个必须解决的问题 ，我发现许多系统取得是客户端的本地时间，造成多个客户端同时操作却时间不一样。而许多人采用频繁从数据库中取值的形式，增加服务器负载压力。当然有人说，数据保存的时候应该取数据库中时间 ，不错，但是涉及到本地数据之间的校验这类的操作，你该不会频繁地去数据库中得时间吧。鉴于此，本文利用windows系统的一个Api函数进行时间同步(Multilayer system development, how to maintain the client and database or application server time synchronization is a problem that must be solved, I found a lot of system is the local time of the client, resulting in multiple clients at the same time the operation is not the same time. And many people use frequent form of data from the database to increase server load pressure. Of course, some people say that when you save data, you should take the time in the database, good, but it involves the local data between the checksum of such operations, you will not go to the database frequently time?. In view of this, this paper uses a Api function of windows system to synchronize time)