如何在Java中比较日期?
例子:
日期为22-02-2010 日期2是今天07-04-2010 Date3是25-12-2010
Date3总是大于date1，而date2总是今天。如何验证今天的日期是否在日期1和日期3之间?
当前回答
试试这个
public static boolean compareDates(String psDate1, String psDate2) throws ParseException{
SimpleDateFormat dateFormat = new SimpleDateFormat ("dd/MM/yyyy");
Date date1 = dateFormat.parse(psDate1);
Date date2 = dateFormat.parse(psDate2);
if(date2.after(date1)) {
return true;
} else {
return false;
}
}
其他回答
这段代码确定今天是在一段时间内。基于韩国地区
Calendar cstart = Calendar.getInstance(Locale.KOREA);
cstart.clear();
cstart.set(startyear, startmonth, startday);
Calendar cend = Calendar.getInstance(Locale.KOREA);
cend.clear();
cend.set(endyear, endmonth, endday);
Calendar c = Calendar.getInstance(Locale.KOREA);
if(c.after(cstart) && c.before(cend)) {
// today is in startyear/startmonth/startday ~ endyear/endmonth/endday
}
Date有前后两种方法，它们之间的比较如下:
if(todayDate.after(historyDate) && todayDate.before(futureDate)) {
// In between
}
要进行包容性比较:
if(!historyDate.after(todayDate) && !futureDate.before(todayDate)) {
/* historyDate <= todayDate <= futureDate */
}
你也可以试试Joda-Time，但请注意:
Joda-Time是Java SE 8之前的Java事实上的标准日期和时间库。现在要求用户迁移到java。时间(jsr - 310)。
后端端口可用于Java 6和7以及Android。
试试这个
public static boolean compareDates(String psDate1, String psDate2) throws ParseException{
SimpleDateFormat dateFormat = new SimpleDateFormat ("dd/MM/yyyy");
Date date1 = dateFormat.parse(psDate1);
Date date2 = dateFormat.parse(psDate2);
if(date2.after(date1)) {
return true;
} else {
return false;
}
}
使用compareTo:
date1.compareTo (date2);
比较这两个日期:
Date today = new Date();
Date myDate = new Date(today.getYear(),today.getMonth()-1,today.getDay());
System.out.println("My Date is"+myDate);
System.out.println("Today Date is"+today);
if (today.compareTo(myDate)<0)
System.out.println("Today Date is Lesser than my Date");
else if (today.compareTo(myDate)>0)
System.out.println("Today Date is Greater than my date");
else
System.out.println("Both Dates are equal");
