使用JavaScript比较两个日期
有人能提出一种方法来比较两个日期的值吗?值将来自文本框。什么格式使用JavaScript比较两个日期,javascript,date,datetime,compare,Javascript,Date,Datetime,Compare,有人能提出一种方法来比较两个日期的值吗?值将来自文本框。什么格式 var date = new Date(); // will give you todays date. // following calls, will let you set new dates. setDate() setFullYear() setHours() setMilliseconds() setMinutes() setMonth() setSeconds() setT
var date = new Date(); // will give you todays date.
// following calls, will let you set new dates.
setDate()
setFullYear()
setHours()
setMilliseconds()
setMinutes()
setMonth()
setSeconds()
setTime()
var yesterday = new Date();
yesterday.setDate(...date info here);
if(date>yesterday) // will compare dates
如果构建Javascript,只需减去它们就可以得到毫秒差(编辑:或只是比较它们):
什么格式
如果构建Javascript,只需减去它们就可以得到毫秒差(编辑:或只是比较它们):
将做您想做的事-为每个日期构造一个,然后使用
,进行比较。将做您想做的事-为每个日期构造一个,然后使用
,进行比较,以便从Javascript中的自由文本创建日期,您需要将其解析为date()对象
您可以使用Date.parse()将自由文本转换为新日期,但如果您可以控制页面,我建议您使用HTML选择框或日期选择器,如或
一旦你有了别人指出的日期,你就可以用简单的算术方法减去日期,然后用一天中的秒数(60*60*24=86400)除以这个数(以秒为单位),将它转换回天数。为了用Javascript中的自由文本创建日期,你需要将它解析成date()对象
您可以使用Date.parse()将自由文本转换为新日期,但如果您可以控制页面,我建议您使用HTML选择框或日期选择器,如或
一旦你有了别人指出的日期,你就可以用简单的算术方法减去日期,然后用一天中的秒数(60*60*24=86400)除以这个数字(以秒为单位),把它转换回天数在javascript中比较日期的最简单方法是首先将其转换为日期对象,然后比较这些日期对象
下面是一个具有三个功能的对象:
- 日期。比较(a,b)
返回一个数字:
- -1如果a
- 如果a=b,则为0
- 1如果a>b
- 如果a或b是非法日期,则为NaN
- 日期。在范围内(d,开始,结束)
返回布尔值或NaN值:
- 如果d在开始和结束之间(包括开始和结束),则为true
- 如果d在开始之前或结束之后,则为false
- 如果一个或多个日期是非法的,则为NaN
- 日期。转换
由其他函数用于将其输入转换为日期对象。输入可以是
- 日期对象:输入按原样返回
- 数组:解释为[年、月、日]注意月份为0-11
- a数字:解释为自1970年1月1日以来的毫秒数(时间戳)
- 字符串
:支持几种不同的格式,如“YYYY/MM/DD”、“MM/DD/YYYY”、“2009年1月31日”等
- 对象:解释为具有年、月和日期属性的对象注意月份为0-11
//来源:http://stackoverflow.com/questions/497790
变量日期={
转换:函数(d){
//将d中的日期转换为日期对象。输入可以是:
//日期对象:未经修改返回
//数组:解释为[年、月、日]。注意:月为0-11。
//数字:解释为毫秒数
//自1970年1月1日起(时间戳)
//字符串:javascript引擎支持的任何格式,如
//“YYYY/MM/DD”、“MM/DD/YYYY”、“2009年1月31日”等。
//对象:解释为具有年、月和日期的对象
//属性。**注意**月份为0-11。
返回(
d、 构造函数===日期?d:
d、 构造函数===数组?新日期(d[0],d[1],d[2]):
d、 构造函数===编号?新日期(d):
d、 构造函数===字符串?新日期(d):
d的类型==“对象”?新日期(d.年、d.月、d.日期):
楠
);
},
比较:功能(a、b){
//比较两个日期(可以是转换支持的任何类型)
//函数)并返回:
//-1:如果ab
//如果a或b是非法日期
//注意:isFinite中的代码执行赋值(=)。
返回(
isFinite(a=this.convert(a).valueOf()&&
isFinite(b=this.convert(b).valueOf())?
(a>b)-(a在javascript中比较日期的最简单方法是首先将其转换为日期对象,然后比较这些日期对象
下面是一个具有三个功能的对象:
- 日期。比较(a,b)
返回一个数字:
- -1如果a
- 如果a=b,则为0
- 1如果a>b
- 如果a或b是非法日期,则为NaN
- 日期。在范围内(d,开始,结束)
返回布尔值或NaN值:
- 如果d在开始和结束之间(包括开始和结束),则为true
- 如果d在开始之前或结束之后,则为false
- 如果一个或多个日期是非法的,则为NaN
- 日期。转换
由其他函数用于将其输入转换为日期对象。输入可以是
- 日期对象:输入按原样返回
- 数组:解释为[年、月、日]。注意月为0-11
- a数字:解释为自1970年1月1日以来的毫秒数(时间戳)
- 字符串
:支持几种不同的格式,如“YYYY/MM/DD”、“MM/DD/YYYY”、“2009年1月31日”等
js>t1 = new Date()
Thu Jan 29 2009 14:19:28 GMT-0500 (Eastern Standard Time)
js>t2 = new Date()
Thu Jan 29 2009 14:19:31 GMT-0500 (Eastern Standard Time)
js>t2-t1
2672
js>t3 = new Date('2009 Jan 1')
Thu Jan 01 2009 00:00:00 GMT-0500 (Eastern Standard Time)
js>t1-t3
2470768442
js>t1>t3
true
var d1 = new Date();
var d2 = new Date(d1);
var same = d1.getTime() === d2.getTime();
var notSame = d1.getTime() !== d2.getTime();
var d1 = new Date();
var d2 = new Date(d1);
console.log(d1 == d2); // prints false (wrong!)
console.log(d1 === d2); // prints false (wrong!)
console.log(d1 != d2); // prints true (wrong!)
console.log(d1 !== d2); // prints true (wrong!)
console.log(d1.getTime() === d2.getTime()); // prints true (correct)
// Source: http://stackoverflow.com/questions/497790
var dates = {
convert:function(d) {
// Converts the date in d to a date-object. The input can be:
// a date object: returned without modification
// an array : Interpreted as [year,month,day]. NOTE: month is 0-11.
// a number : Interpreted as number of milliseconds
// since 1 Jan 1970 (a timestamp)
// a string : Any format supported by the javascript engine, like
// "YYYY/MM/DD", "MM/DD/YYYY", "Jan 31 2009" etc.
// an object : Interpreted as an object with year, month and date
// attributes. **NOTE** month is 0-11.
return (
d.constructor === Date ? d :
d.constructor === Array ? new Date(d[0],d[1],d[2]) :
d.constructor === Number ? new Date(d) :
d.constructor === String ? new Date(d) :
typeof d === "object" ? new Date(d.year,d.month,d.date) :
NaN
);
},
compare:function(a,b) {
// Compare two dates (could be of any type supported by the convert
// function above) and returns:
// -1 : if a < b
// 0 : if a = b
// 1 : if a > b
// NaN : if a or b is an illegal date
// NOTE: The code inside isFinite does an assignment (=).
return (
isFinite(a=this.convert(a).valueOf()) &&
isFinite(b=this.convert(b).valueOf()) ?
(a>b)-(a<b) :
NaN
);
},
inRange:function(d,start,end) {
// Checks if date in d is between dates in start and end.
// Returns a boolean or NaN:
// true : if d is between start and end (inclusive)
// false : if d is before start or after end
// NaN : if one or more of the dates is illegal.
// NOTE: The code inside isFinite does an assignment (=).
return (
isFinite(d=this.convert(d).valueOf()) &&
isFinite(start=this.convert(start).valueOf()) &&
isFinite(end=this.convert(end).valueOf()) ?
start <= d && d <= end :
NaN
);
}
}
function datesEqual(a, b)
{
return (!(a>b || b>a))
}
var diff = +A - +B;
/* Compare the current date against another date.
*
* @param b {Date} the other date
* @returns -1 : if this < b
* 0 : if this === b
* 1 : if this > b
* NaN : if a or b is an illegal date
*/
Date.prototype.compare = function(b) {
if (b.constructor !== Date) {
throw "invalid_date";
}
return (isFinite(this.valueOf()) && isFinite(b.valueOf()) ?
(this>b)-(this<b) : NaN
);
};
var a = new Date(2011, 1-1, 1);
var b = new Date(2011, 1-1, 1);
var c = new Date(2011, 1-1, 31);
var d = new Date(2011, 1-1, 31);
assertEquals( 0, a.compare(b));
assertEquals( 0, b.compare(a));
assertEquals(-1, a.compare(c));
assertEquals( 1, c.compare(a));
var first = '2012-11-21';
var second = '2012-11-03';
if(parseInt(first.replace(/-/g,""),10) > parseInt(second.replace(/-/g,""),10)){
//...
}
from_date ='10-07-2012';
to_date = '05-05-2012';
var fromdate = from_date.split('-');
from_date = new Date();
from_date.setFullYear(fromdate[2],fromdate[1]-1,fromdate[0]);
var todate = to_date.split('-');
to_date = new Date();
to_date.setFullYear(todate[2],todate[1]-1,todate[0]);
if (from_date > to_date )
{
alert("Invalid Date Range!\nStart Date cannot be after End Date!")
return false;
}
var firstValue = "2012-05-12".split('-');
var secondValue = "2014-07-12".split('-');
var firstDate=new Date();
firstDate.setFullYear(firstValue[0],(firstValue[1] - 1 ),firstValue[2]);
var secondDate=new Date();
secondDate.setFullYear(secondValue[0],(secondValue[1] - 1 ),secondValue[2]);
if (firstDate > secondDate)
{
alert("First Date is greater than Second Date");
}
else
{
alert("Second Date is greater than First Date");
}
var timestamp_1970 = new Date(0).getTime(); // 1970-01-01 00:00:00
var timestamp = new Date().getTime(); // Current Timestamp
var timestamp = 0; // 1970-01-01 00:00:00
var DateObject = new Date(timestamp);
function areSameDate(d1, d2){
return d1 - d2 === 0
}
var d1 = new Date(2013, 0, 1);
var d2 = new Date(2013, 0, 2);
d1 < d2; // true
d1 <= d2; // true
d1 > d2; // false
d1 >= d2; // false
var d1 = new Date(2013, 0, 1);
var d2 = new Date(2013, 0, 1);
/*
* note: d1 == d2 returns false as described above
*/
d1.getTime() == d2.getTime(); // true
d1.valueOf() == d2.valueOf(); // true
Number(d1) == Number(d2); // true
+d1 == +d2; // true
var curDate=new Date();
var startDate=document.forms[0].m_strStartDate;
var endDate=document.forms[0].m_strEndDate;
var startDateVal=startDate.value.split('-');
var endDateVal=endDate.value.split('-');
var firstDate=new Date();
firstDate.setFullYear(startDateVal[2], (startDateVal[1] - 1), startDateVal[0]);
var secondDate=new Date();
secondDate.setFullYear(endDateVal[2], (endDateVal[1] - 1), endDateVal[0]);
if(firstDate > curDate) {
alert("Start date cannot be greater than current date!");
return false;
}
if (firstDate > secondDate) {
alert("Start date cannot be greater!");
return false;
}
var from = '08/19/2013 00:00'
var to = '08/12/2013 00:00 '
function isFromBiggerThanTo(dtmfrom, dtmto){
return new Date(dtmfrom).getTime() >= new Date(dtmto).getTime() ;
}
console.log(isFromBiggerThanTo(from, to)); //true
var date_one = '2013-07-29 01:50:00',
date_two = '2013-07-29 02:50:00';
//getTime() returns the number of milliseconds since 01.01.1970.
var timeStamp_date_one = new Date(date_one).getTime() ; //1375077000000
console.log(typeof timeStamp_date_one);//number
var timeStamp_date_two = new Date(date_two).getTime() ;//1375080600000
console.log(typeof timeStamp_date_two);//number
var myDateTime = new dtmFRM();
alert(myDateTime.ToString(1375077000000, "MM/dd/yyyy hh:mm:ss ampm"));
//07/29/2013 01:50:00 AM
alert(myDateTime.ToString(1375077000000,"the year is yyyy and the day is dddd"));
//this year is 2013 and the day is Monday
alert(myDateTime.ToString('1/21/2014', "this month is MMMM and the day is dd"));
//this month is january and the day is 21
function CompareDate(tform){
var startDate = new Date(document.getElementById("START_DATE").value.substring(0,10));
var endDate = new Date(document.getElementById("END_DATE").value.substring(0,10));
if(tform.START_DATE.value!=""){
var estStartDate = tform.START_DATE.value;
//format for Oracle
tform.START_DATE.value = estStartDate + " 00:00:00";
}
if(tform.END_DATE.value!=""){
var estEndDate = tform.END_DATE.value;
//format for Oracle
tform.END_DATE.value = estEndDate + " 00:00:00";
}
if(endDate <= startDate){
alert("End date cannot be smaller than or equal to Start date, please review you selection.");
tform.START_DATE.value = document.getElementById("START_DATE").value.substring(0,10);
tform.END_DATE.value = document.getElementById("END_DATE").value.substring(0,10);
return false;
}
}
Date.prototype.sameDay = function(d) {
return this.getFullYear() === d.getFullYear()
&& this.getDate() === d.getDate()
&& this.getMonth() === d.getMonth();
}
if(date1.sameDay(date2)) {
// highlight day on calendar or something else clever
}
var date_today=new Date();
var formated_date = formatDate(date_today);//Calling formatDate Function
var input_date="2015/04/22 11:12 AM";
var currentDateTime = new Date(Date.parse(formated_date));
var inputDateTime = new Date(Date.parse(input_date));
if (inputDateTime <= currentDateTime){
//Do something...
}
function formatDate(date) {
var hours = date.getHours();
var minutes = date.getMinutes();
var ampm = hours >= 12 ? 'PM' : 'AM';
hours = hours % 12;
hours = hours ? hours : 12; // the hour '0' should be '12'
hours = hours < 10 ? '0'+hours : hours ;
minutes = minutes < 10 ? '0'+minutes : minutes;
var strTime = hours+":"+minutes+ ' ' + ampm;
return date.getFullYear()+ "/" + ((date.getMonth()+1) < 10 ? "0"+(date.getMonth()+1) :
(date.getMonth()+1) ) + "/" + (date.getDate() < 10 ? "0"+date.getDate() :
date.getDate()) + " " + strTime;
}
function compare(dateTimeA, dateTimeB) {
var momentA = moment(dateTimeA,"DD/MM/YYYY");
var momentB = moment(dateTimeB,"DD/MM/YYYY");
if (momentA > momentB) return 1;
else if (momentA < momentB) return -1;
else return 0;
}
alert(compare("11/07/2015", "10/07/2015"));
var date1= new Date("01/01/2014").setHours(0,0,0,0);
var date2= new Date("01/01/2014").setHours(0,0,0,0);
var date1 = '01/12/2018';
var date2 = '12/12/2018';
date1 = new Date(date1);
date2 = new Date(date2);
date1 > date2; //false
date1 < date2; //true
date1 >= date2; //false
date1 <= date2; //true
// create a date (utc midnight) reflecting the value of myDate and the environment's timezone offset.
new Date(Date.UTC(myDate.getFullYear(),myDate.getMonth(), myDate.getDate()));
// the date in London of a moment in time. Device timezone is ignored.
new Date(Date.UTC(myDate.getUTCYear(), myDate.getyUTCMonth(), myDate.getUTCDate()));
var first = '2012-11-21';
var second = '2012-11-03';
if (new Date(first) > new Date(second) {
.....
}