[英]Javascript compare two dates to get a difference
我正在嘗試比較兩個不同的日期,以查看輸入的日期是否是今天日期的7天之后。 我做了一些谷歌搜索,並提出了這個:
function val_date(input){
var date = new Date(input);
date = date.getTime() / 1000;
var timestamp = new Date().getTime() + (7 * 24 * 60 * 60 * 1000)
window.alert("Date: "+date + " = N_Date: "+timestamp);
if(timestamp > date || timestamp === date){
// The selected time is less than 7 days from now
return false;
}
else if(timestamp < date){
// The selected time is more than 7 days from now
return true;
}
else{
// -Exact- same timestamps.
return false;
}
}
我正在使用警報,以便可以檢查進度以確保日期不同。 警報的輸出僅顯示:
日期:NaN = N_Date = 13255772630(<-或類似名稱)。
我在這里做錯什么了嗎?
不確定是否有幫助,但我的日期格式為DD-MM-YYYY
如果您要比較日期並且不想包含時間,則可以使用以下方法:
// dateString is format DD-MM-YYYY
function isMoreThan7DaysHence(dateString) {
// Turn string into a date object at 00:00:00
var t = dateString.split('-');
var d0 = new Date(t[2], --t[1], t[0]);
// Create a date for 7 days hence at 00:00:00
var d1 = new Date();
d1.setHours(0, 0, 0, 0);
d1.setDate(d1.getDate() + 7);
return d0 >= d1;
}
請注意,今天日期的小時數必須為零。
日期: NaN
因為無法傳遞創建日期的字符串來創建日期
Date.prototype.addDays = function (days) { this.setDate(this.getDate() + days); return this; }; function val_date(input) { var inputDate = new Date(input); var dateWeek = new Date().addDays(7); console.log(inputDate, dateWeek); if (inputDate < dateWeek) { // The selected time is less than 7 days from now return false; } else { // The selected time is more than 7 days from now return true; } }
使用moment.js :
moment([2013, 2, 29]).fromNow();
假設輸入是有效的Javascript Date對象,則可以嘗試:
function dateDifference(oldDate) {
var currentDate = new Date();
var difference = currentDate - oldDate; //unit: milliseconds
var numDays = 7;
var threshHoldTime = numDays * (24 * 60 * 60 * 1000); //seven days in milliseconds
if (difference > threshHoldTime ) {
console.log("The difference is greateer then then 7 days");
}
else {
console.log("the date is not enough: " + difference);
}
}
這樣嘗試
var date = new Date(input).getTime(); // Get the milliseconds
var today = new Date();
//You can't compare date,
//so convert them to milliseconds
today = new Date(today.setDate(today.getDate() + 7)).getTime();
if (inputDate < today) {
// The selected time is less than 7 days from now
return false;
} else if{ ()
// -Exact- same timestamps.
return false;
}
else {
// The selected time is more than 7 days from now
return true;
}
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