为什么date.gettime（）在Java中总是返回上一个日期，而不是今天的日期？

Question

I have following code, running on Unix server (WAS 5.1), it's a test environment in our company. When I try to execute the below code, I always get yesterday's date (ie if I execute today 9/27/2012 it returns date as 9/26/2012)

long userSelectedTimeLong = date.getTime()

Answer 1

Date returns time based on TimeZone of the machine. It is possible that your sever might be hosted some where else and TimeZone value is different. You need to compare value of date by having same TimeZone.

Once you do that next task is is date variable really contains current date. You can print a simple log using new Date().getTime()

Answer 2

我曾经遇到过类似的问题；-)检查是否在应用程序启动时实例化了本地日期变量，并且在应用程序运行时未刷新性能。

Answer 3

使用long userSelectedTimeLong = Calendar.getInstance().getTimeInMillis()会很好

Answer 4

Another possibility : does the server sync with some kind of time service ? (ntp, ...) Maybe it 's just the system date on the Unix machine that has been set wrong.