Calendar.getTime（）返回不同的日期对象

Question

我有一些代码女巫使用日历将Joda-DateTime转换为java.util.Date。

Calendar cal = Calendar.getInstance(zone.toTimeZone()); 
DateTime zonedDT = internal.toDateTime(zone); 
// Due to JDK and Joda-Time both have time zone implementations and these differ in accuracy. 
// Joda-Time's implementation is generally more up to date and thus more accurate - for example JDK1.3 has no historical data. 
// The effect of this is that the field values of the Calendar may differ from those of this object, even though the millisecond value is the same. 
// Most of the time this just means that the JDK field values are wrong, as our time zone information is more up to date 
// That's why we should manually set date,year, time to calendar 
cal.set(zonedDT.getYear(), zonedDT.getMonthOfYear() - 1, zonedDT.getDayOfMonth(), zonedDT.getHourOfDay(), zonedDT.getMinuteOfHour(), zonedDT.getSecondOfMinute()); 
return cal.getTime(); 

问题在于以这种方式创建的Date实例与毫秒之间的差异。

我一直在使用代码framgent评价这段代码

Calendar cal = Calendar.getInstance(); 
cal.set(2014,3,18,14,44,32); 
cal.getTime() 

在IntelliJ IDEA的tryed，并返回不同的日期。差异以毫秒为单位。
我的操作系统是Windwos。
JDK 1.7.0_25

Answer 1

添加如下一行：

cal.set(Calendar.MILLISECOND, 0); 

将设置毫秒值。该API文档指定字段如下：

public final void set(int year, int month, int date, int hourOfDay, int minute, int second) 

所以它不提供粒度设置millisconds。

旁注：

如果您使用的是Java日期库签Jodatime：http://www.joda.org/joda-time/它的好多了！