[英]How do I calculate how many seconds between two dates?
所以我有兩個日期YYYY-MM-DD
和ZZZZ-NN-EE
我怎樣才能知道它們之間有多少秒?
我將 YYYY 和 ZZZZ 表示整數值,表示年份,MM 和 NN 表示整數值,表示一年中的月份,DD 和 EE 作為整數值表示月份的日期。
var t1 = new Date(YYYY, MM, DD, 0, 0, 0, 0);
var t2 = new Date(ZZZZ, NN, EE, 0, 0, 0, 0);
var dif = t1.getTime() - t2.getTime();
var Seconds_from_T1_to_T2 = dif / 1000;
var Seconds_Between_Dates = Math.abs(Seconds_from_T1_to_T2);
MDN 站點是供將來參考的方便來源
或者,如果您的日期采用 javascript 可以解析的格式
var dif = Date.parse(MM + " " + DD + ", " + YYYY) - Date.parse(NN + " " + EE + ", " + ZZZZ);
然后您可以將該值用作以毫秒為單位的差異(我的兩個示例中的差異具有相同的含義)
只需減去:
var a = new Date(); alert("Wait a few seconds, then click OK"); var b = new Date(); var difference = (b - a) / 1000; console.log("You waited: " + difference + " seconds");
你可以簡單地做到這一點。
var secondBetweenTwoDate = Math.abs((new Date().getTime() - oldDate.getTime()) / 1000);
如果您的一個或兩個日期都在未來,那么如果您想要秒精度,恐怕您就是 SOL。 UTC 時間有閏秒,直到它們發生前大約 6 個月才知道,因此任何比這更遠的日期都可能不准確一些秒數(實際上,由於人們不經常更新他們的機器,你可能會發現未來的任何時間都偏離了幾秒)。
這很好地解釋了設計日期/時間庫的理論以及為什么會這樣:http: //www.boost.org/doc/libs/1_41_0/doc/html/date_time/details.html#date_time.tradeoffs
創建兩個Date
對象並在兩者上調用valueOf()
,然后比較它們。
var a = new Date("2010 jan 10"),
b = new Date("2010 jan 9");
alert(
a + "\n" +
b + "\n" +
"Difference: " + ((+a - +b) / 1000)
);
簡單的方法:
function diff_hours(dt2, dt1)
{
var diff =(dt2.getTime() - dt1.getTime()) / 1000;
diff /= (60 * 60);
return Math.abs(Math.round(diff));
}
function diff_minutes(dt2, dt1)
{
var diff =(dt2.getTime() - dt1.getTime()) / 1000;
diff /= (60);
return Math.abs(Math.round(diff));
}
function diff_seconds(dt2, dt1)
{
var diff =(dt2.getTime() - dt1.getTime()) / 1000;
return Math.abs(Math.round(diff));
}
function diff_miliseconds(dt2, dt1)
{
var diff =(dt2.getTime() - dt1.getTime());
return Math.abs(Math.round(diff));
}
dt1 = new Date(2014,10,2);
dt2 = new Date(2014,10,3);
console.log(diff_hours(dt1, dt2));
dt1 = new Date("October 13, 2014 08:11:00");
dt2 = new Date("October 14, 2014 11:13:00");
console.log(diff_hours(dt1, dt2));
console.log(diff_minutes(dt1, dt2));
console.log(diff_seconds(dt1, dt2));
console.log(diff_miliseconds(dt1, dt2));
function parseDate(str) {
const [dateStr, timeStr] = str.split(' ');
const [m,d,y] = dateStr.split('/');
const [h,min] = timeStr.split(':');
const date = new Date(y,m,d,h,min,0, 0);
return date;
}
const date1 = parseDate('28/6/2022 22:55');
const date2 = parseDate('28/6/2022 22:58');
const diffInSeconds = (date2 - date1) / 1000;
console.log(diffInSeconds)
在 bash 中:
bc <<< "$(date --date='1 week ago' +%s) - \
$(date --date='Sun, 29 Feb 2004 16:21:42 -0800' +%s)"
它確實需要安裝 bc 和 gnu date。
.Net 提供 TimeSpan 類來為您計算。
var time1 = new Date(YYYY, MM, DD, 0, 0, 0, 0)
var time2 = new Date(ZZZZ, NN, EE, 0, 0, 0, 0)
Dim ts As TimeSpan = time2.Subtract(time1)
ts.TotalSeconds
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