javascript 如何以 dd/mm/yyyy 格式比较两个不同的日期
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How to compare two different dates in dd/mm/yyyy format
提问by Raghu
Can anyone help me in finding the solution
谁能帮我找到解决方案
i just want to compare two dates in dd/mm/yyyy format.
我只想比较 dd/mm/yyyy 格式的两个日期。
function compareDate(dt1 , dt2 , formatString){var returnVal = 2;
var dt1Parts;
var dt2Parts;
var dt1dd;
var dt1mm;
var dt1yyyy;
var dt2dd;
var dt2mm;
var dt2yyyy;
if(formatString == 'dd/mm/yyyy'){
dt1Parts = dt1.split('/');
dt2Parts = dt2.split('/');
dt1dd = parseInt(dt1Parts[0]);
dt1mm = parseInt(dt1Parts[1]);
dt1yyyy = parseInt(dt1Parts[2]);
dt2dd = parseInt(dt2Parts[0]);
dt2mm = parseInt(dt2Parts[1]);
dt2yyyy = parseInt(dt2Parts[2]);
}
else if(formatString == 'dd-mm-yyyy'){
dt1Parts = dt1.split('-');
dt2Parts = dt2.split('-');
dt1dd = parseInt(dt1Parts[0]);
dt1mm = parseInt(dt1Parts[1]);
dt1yyyy = parseInt(dt1Parts[2]);
dt2dd = parseInt(dt2Parts[0]);
dt2mm = parseInt(dt2Parts[1]);
dt2yyyy = parseInt(dt2Parts[2]);
}else{
alert(formatString+' format is not supported.');
}
if(dt1yyyy == dt2yyyy && dt1mm == dt2mm && dt1dd == dt2dd){
returnVal = 0;
}
else if(dt1yyyy > dt2yyyy){
returnVal = 1 ;
}else if(dt1yyyy == dt2yyyy ){
if(dt1mm > dt2mm){
returnVal = 1;
}else if(dt1mm == dt2mm){
if(dt1dd > dt2dd){
returnVal = 1;
}else{
returnVal = -1;
}
}else{
returnVal = -1;
}
}else{
returnVal = -1;
}
return returnVal;
}
Thanks in advance, Shilpa
提前致谢，希尔帕
回答by jcomeau_ictx
Invert the strings to yyyy/mm/dd, or convert them to a number or Date object.
将字符串反转为 yyyy/mm/dd，或将它们转换为数字或日期对象。
The simplest way just for comparison would be ASCII order. Invert using something like this:
仅用于比较的最简单方法是 ASCII 顺序。使用这样的方法反转：
function invert(date) {
return date.split(/[/-]/).reverse().join("")
}
function compareDates(date1, date2) {
return invert(date1).localeCompare(invert(date2));
}
回答by Samuli Hakoniemi
Here's how you convert that string format to a date:
以下是将该字符串格式转换为日期的方法：
var myString = "17/07/1979",
correctFormat = myString.replace(/(\d+)\/(\d+)\/(\d+)/, "//"),
myDate = new Date(correctFormat);
回答by Kevin Hsu
Without knowing what language or class libs you're working with:
不知道您正在使用什么语言或类库：
Method 1: Resort your strings to be yyyymmdd and the do string compare. Method 2: Stuff yyyy mm and dd into the high, middle, and low bits of an integer and compare.
方法 1：使您的字符串成为 yyyymmdd 并进行字符串比较。方法二：将yyyy mm和dd填入一个整数的高、中、低位并进行比较。
回答by Jayantha Lal Sirisena
Try this
试试这个
var date1=new Date('your date1 string');
var date2=new Date('your date2 string');
var difference=new Date(date1.getTime()-date2.getTime());
回答by TweeZz
The easiest way is probably to create 2 javascript Date objects from your input string. You could achieve that by chopping your input into day, month and year. You can use the 'substring' function for that.
最简单的方法可能是从您的输入字符串创建 2 个 javascript Date 对象。您可以通过将输入分成日、月和年来实现这一目标。您可以为此使用“子字符串”函数。
Then you can do:
然后你可以这样做：
var firstDate = new Date(year1, month1, day1);
var secondDate = new Date(year2, month2, day2);
Once you have 2 date objects, you can use the normal compare operators:
一旦你有 2 个日期对象，你就可以使用普通的比较运算符：
if (firstDate > secondDate)
// do something
else
...
回答by shafi7468
if ($.datepicker.parseDate('dd/mm/yy', fDate) > $.datepicker.parseDate('dd/mm/yy', tDate)) {
//do something
}
You can compare two dates.Here I compare from date greater than to date
try this
你可以比较两个日期。在这里我比较从大于到日期的日期
试试这个
