Java 从日期对象中获取时间
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Getting time from a Date Object
提问by theJava
I have an date object from which i need to getTime(). The issue is it always shows 00:00:00.
我有一个我需要的日期对象getTime()。问题是它总是显示00:00:00.
SimpleDateFormat localDateFormat = new SimpleDateFormat("HH:mm:ss");
long date = Utils.getDateObject(DateObject).getTime();
String time = localDateFormat.format(date);
Why is the time always '00:00:00'. Should i append Time to my Date Object
为什么时间总是'00:00:00'。我应该追加Time to my Date Object
采纳答案by T.J. Crowder
You should pass the actual Dateobject into format, not a long:
您应该将实际Date对象传递给format，而不是传递给long：
SimpleDateFormat localDateFormat = new SimpleDateFormat("HH:mm:ss");
String time = localDateFormat.format(Utils.getDateObject(DateObject));
Assuming that whatever Utils.getDateObject(DateObject)is actually returns a Date(which is impliedby your question but not actually stated), that should work fine.
假设Utils.getDateObject(DateObject)实际上返回的是 a Date（这是您的问题所暗示的，但实际上并未说明），那应该可以正常工作。
For example, this works perfectly:
例如，这完美地工作：
import java.util.Date;
import java.text.SimpleDateFormat;
public class SDF {
public static final void main(String[] args) {
SimpleDateFormat localDateFormat = new SimpleDateFormat("HH:mm:ss");
String time = localDateFormat.format(new Date());
System.out.println(time);
}
}
Re your comment below:
在下面回复您的评论：
Thanks TJ, but actually i am still getting 00:00:00 as time.
谢谢 TJ，但实际上我仍然在 00:00:00 作为时间。
That means your Dateobject has zeroes for hours, minutes, and seconds, like so:
这意味着您的Date对象的小时、分钟和秒都为零，如下所示：
import java.util.Date;
import java.text.SimpleDateFormat;
public class SDF {
public static final void main(String[] args) {
SimpleDateFormat localDateFormat = new SimpleDateFormat("HH:mm:ss");
String time = localDateFormat.format(new Date(2013, 4, 17)); // <== Only changed line (and using a deprecated API)
System.out.println(time);
}
}
回答by M Sach
Apart from above solution , you can also use calendar class if you don't have specific requirement
除了上述解决方案，如果您没有特定要求，您还可以使用日历类
Calendar cal1 =new GregorianCalendar() or Calendar.getInstance();
SimpleDateFormat date_format = new SimpleDateFormat("HH:mm:ss");
System.out.println(date_format.format(cal1.getTime()));
回答by dmvstar
For example, you can use next code:
例如，您可以使用下一个代码：
public static int getNotesIndexByTime(Date aDate){
int ret = 0;
SimpleDateFormat localDateFormat = new SimpleDateFormat("HH");
String sTime = localDateFormat.format(aDate);
int iTime = Integer.parseInt(sTime);
return iTime;// count of hours 0-23
}
