java - 如何获取字符串形式的时间差

Question

我试图获取字符串形式的时间之间的差异，但我得到的差异始终为 0，我正在黑莓上工作。

            long startTime = HttpDateParser.parse("01:00:00");
            System.out.println("start time is :" + startTime);
            long endTime = HttpDateParser.parse("02:00:00");
            System.out.println("end time is :" + endTime);
            long diff = endTime - startTime;
            long diffHours = diff / (60 * 60 * 1000);

Answer 1

如果您只想计算同一天两次之间的时间(格式为“HH:MM:SS”)，那么这非常简单

使用简单的 HttpDateParser 并获取具有正确格式的任何日期

例如“2012 年 3 月 27 日星期二 09:11:37 GMT”

这里我们仅替换时间，然后您将获得两次之间的时间(以米为单位)

String common="Tue, 27 Mar 2012 "; //09:11:37 GMT
            String time1="1:50:10";
            String time2="3:30:20";
             long startTime = HttpDateParser.parse(common+time1+" GMT");
             System.out.println("start time is :" + startTime);
             long endTime =  HttpDateParser.parse(common+time2+" GMT");
             System.out.println("end time is :" + endTime);
             long diff = endTime - startTime;
            long hours=diff/(60*60*1000);
         long minutes=(diff%(60*60*1000))/(60*1000);

         long sec=((diff%(60*60*1000))%(60*1000))/1000;
         String formateddate="";
         if(hours<10)
         {
             formateddate="0"+hours;
         }else{
             formateddate=""+hours;
         }
         if(minutes<10)
         {
             formateddate=formateddate+":0"+minutes;
         }else{
             formateddate=formateddate+":"+minutes;
         }
         if(sec<10)
         {
             formateddate=formateddate+":0"+sec;
         }else{
             formateddate=formateddate+":"+sec;
         }


         System.out.println("Difference in Houres:"+formateddate);

我得到的输出为

[0.0] start time is :1332813010000
[0.0] end time is :1332819020000
[0.0] Difference in Houres:01:40:10

注意:如果您想在两个不同的日期之间进行计算这里您需要传递的日期格式应该正确，例如:“YYYY-mm-dd hh:mm:ss”

这里我提供一些示例

import java.util.Calendar;

import net.rim.device.api.i18n.SimpleDateFormat;
import net.rim.device.api.io.http.HttpDateParser;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.FieldChangeListener;
import net.rim.device.api.ui.component.ButtonField;
import net.rim.device.api.ui.component.LabelField;
import net.rim.device.api.ui.container.MainScreen;
import net.rim.device.api.ui.picker.DateTimePicker;

public final class Screen1 extends MainScreen implements FieldChangeListener
{
    /**
     * Creates a new MyScreen object
     */
    ButtonField date1;
    ButtonField date2;
    ButtonField button;
    LabelField lbl;
    DateTimePicker picker;
    String str="";
    Calendar cal;   

    public Screen1()
    {   

        date1=new ButtonField("date1");
        date1.setChangeListener(this);
        add(date1);

        date2=new ButtonField("date2");
        date2.setChangeListener(this);
        add(date2);

        button = new ButtonField("Screen 1 ");
        button.setChangeListener(this);
        add(button);
        lbl=new LabelField();
        add(lbl);
    }
    public void fieldChanged(Field field, int context) {
        if(field==button){//Tue, 27 Mar 2012 09:11:37 GMT

            System.out.println(date1.getLabel().toString()+"   "+date2.getLabel().toString());
             long startTime = HttpDateParser.parse(date1.getLabel().toString());
             System.out.println("start time is :" + startTime);
             long endTime =  HttpDateParser.parse(date2.getLabel().toString());
             System.out.println("end time is :" + endTime);
             long diff = endTime - startTime;

             long hours=diff/(60*60*1000);
         long minutes=(diff%(60*60*1000))/(60*1000);

         long sec=((diff%(60*60*1000))%(60*1000))/1000;
         String formateddate="";
         if(hours<10)
         {
             formateddate="0"+hours;
         }else{
             formateddate=""+hours;
         }
         if(minutes<10)
         {
             formateddate=formateddate+":0"+minutes;
         }else{
             formateddate=formateddate+":"+minutes;
         }
         if(sec<10)
         {
             formateddate=formateddate+":0"+sec;
         }else{
             formateddate=formateddate+":"+sec;
         }


         System.out.println("Difference in Houres:"+formateddate);
         lbl.setText("Time Between above dates is :"+formateddate);
        }else if(field==date1)
        {
            date1.setLabel(getDateTimeFromPicker().toString());                                 

        }else if(field==date2)
        {
            date2.setLabel(getDateTimeFromPicker().toString());
        }

    }
    private String getDateTimeFromPicker()
    {
        picker = DateTimePicker.createInstance( Calendar.getInstance(), "yyyy-MM-dd", "HH:mm:ss");
        picker.doModal();
        cal=picker.getDateTime();
        str="";
        if((cal.get(Calendar.MONTH)+1)<10)
            str=str+cal.get(Calendar.YEAR)+"-"+"0"+(cal.get(Calendar.MONTH)+1);
        else
            str=str+cal.get(Calendar.YEAR)+"-"+(cal.get(Calendar.MONTH)+1);

        if(cal.get(Calendar.DATE)<10)
            str=str+"-"+"0"+cal.get(Calendar.DATE);
        else
            str=str+"-"+cal.get(Calendar.DATE);

        if(cal.get(Calendar.HOUR_OF_DAY)<10)
            str=str+" "+"0"+cal.get(Calendar.HOUR_OF_DAY);
        else
            str=str+" "+cal.get(Calendar.HOUR_OF_DAY);

        if(cal.get(Calendar.MINUTE)<10)
            str=str+":"+"0"+cal.get(Calendar.MINUTE);
        else
            str=str+":"+cal.get(Calendar.MINUTE);

        if(cal.get(Calendar.SECOND)<10)
            str=str+":"+"0"+cal.get(Calendar.SECOND);
        else
            str=str+":"+cal.get(Calendar.SECOND);
        return str;
    }
}

您可以在屏幕上看到以下输出