一个关于时间的java程序，里面有把时间转化成String类型，如 yyyy/mm/dd 等，里面还有许多函数，可以作为基础函数用，功能很强大。-A java program on time, which has the time into String type, such as ' yyyy/mm/dd'　and so on, which many functions can be used as the basis of function, use, powerful.