java 如何检查日期是否超过 7 天
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How to check if date exceeds more than seven days
提问by CodeNotFound
I would like to check if two date exceeds a week, like, check if two dates have seven days,
我想检查两个日期是否超过一周，例如检查两个日期是否有 7 天，
at point the data range should be within a week only(7 Days).
此时数据范围应仅在一周内（7 天）。
i have tried something like this,
我试过这样的事情，
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
public class IsDateRangeExceedsWeek
{
public static void main( String[] args )
{
try{
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date fromDate = sdf.parse("2015-05-01");
Date toDate = sdf.parse("2015-05-07");
System.out.println(sdf.format(fromDate));
System.out.println(sdf.format(toDate));
if(fromDate.compareTo(toDate)>0){
System.out.println("From Date should be less than To Date");
} else if(fromDate.compareTo(toDate)==0){
System.out.println("From Date is equal to To Date");
}
}catch(ParseException ex){
ex.printStackTrace();
}
}
}
Could some one help ?
有人可以帮忙吗？
回答by Veselin Davidov
The easiest way is to use Jodatimeand use
最简单的方法是使用Jodatime并使用
Days.daysBetween(start, end).getDays()
Another solution is to use Calendar, add 7 days and compare again.
另一种解决方案是使用日历，添加 7 天并再次比较。
Calendar c=Calendar.getInstance();
c.setTime(fromDate);
c.add(Calendar.DATE,7);
if(c.getTime().compareTo(toDate)<0){
It's more than 7 days.
}
回答by Misha
Using the java.timeclasses built into Java 8 and later:
使用Java 8 及更高版本中内置的java.time类：
LocalDate from = LocalDate.parse("2015-05-01");
LocalDate to = LocalDate.parse("2015-05-07");
long days = ChronoUnit.DAYS.between(from, to); // 6 days
long weeks = ChronoUnit.WEEKS.between(from, to); // 0 weeks
