String类型日期转换成date类型日期,再提取间隔

Question

DateUtil??
自己写的类？

Answer 1

用StringTokenizer分析，把结果放在Calendar里面处理，

Answer 2

String stTime="2007-5-3";
String endTime="2007-6-3";
try
{
Date startdatetime=simpleDateFormat.parse(stTime);
Date enddatetime=simpleDateFormat.parse(endTime);
long between;
if(startdatetime.compareTo(enddatetime) >= 0)
between = (startdatetime.getTime()-enddatetime.getTime())/(24*60*60*1000);
else
between = (enddatetime.getTime()-startdatetime.getTime())/(24*60*60*1000);
System.out.println("Between " + stTime + " to " + endTime + ":" + between + " days!");
} catch (ParseException e)
{
e.printStackTrace();
}

Answer 3

SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");

Answer 4

import java.util.*
import java.text.*String stTime="2007-5-3";
String endTime="2007-6-3";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date startdatetime=sdf.parse(stTime);          //格式化
Date enddatetime=sdf.parse(endTime);           //格式化Calendar calendar = Calendar.getInstance();
calendar.setTime(startdatetime);
long timestart = calendar.getTimeInMillis();
calendar.setTime(enddatetime);
long timeend = calendar.getTimeInMillis();
long theday = (timeend - timestart) / (1000 * 60 * 60 * 24);   //时间间隔
System.out.print(theday);

Answer 5

public class  Test
{
public static void main(String[] args) 
{
System.out.println(compare("2007-03-01","2007-02-02")/(1000*60*60*24));
}
public static Long compare(String first,String second)
{
java.text.DateFormat formatter=new java.text.SimpleDateFormat("yyyy-MM-dd");//规定的日期的格式，必需为2007-01-01这样的格式
java.util.Calendar firstCal=java.util.Calendar.getInstance();
java.util.Calendar secondCal=java.util.Calendar.getInstance();
try
{
firstCal.setTime(formatter.parse(first));
firstCal.set(java.util.Calendar.HOUR_OF_DAY,0);
firstCal.set(java.util.Calendar.MINUTE,0);
firstCal.set(java.util.Calendar.SECOND,0);
firstCal.set(java.util.Calendar.MILLISECOND,0);
secondCal.setTime(formatter.parse(second));
secondCal.set(java.util.Calendar.HOUR_OF_DAY,0);
secondCal.set(java.util.Calendar.MINUTE,0);
secondCal.set(java.util.Calendar.SECOND,0);
secondCal.set(java.util.Calendar.MILLISECOND,0);
return new Long(secondCal.getTimeInMillis()-firstCal.getTimeInMillis());//返回second所代表的日期和first所代表的日期之间相差的毫秒数，如果你想转换成天数，那就把这个结果除以(1000*60*60*24)，转化成小时、分、秒等依此类推
}
catch (java.text.ParseException e)
{
System.out.println("输入的参数格式不符合要求，需要是2007-01-01这样的格式");
return null;
}
}
}