JavaScript之间的日期差异 [英] Difference between dates in JavaScript

问题描述

如何找到两个日期之间的差异？

How to find the difference between two dates?

推荐答案

使用 Date 对象及其毫秒值，差异可以计算：

By using the Date object and its milliseconds value, differences can be calculated:

var a = new Date(); // Current date now.
var b = new Date(2010, 0, 1, 0, 0, 0, 0); // Start of 2010.
var d = (b-a); // Difference in milliseconds.

您可以通过将毫秒数除以1000来获取秒数（作为整数/整数）将其转换为秒，然后将结果转换为整数（这将删除表示毫秒的小数部分）：

You can get the number of seconds (as a integer/whole number) by dividing the milliseconds by 1000 to convert it to seconds then converting the result to an integer (this removes the fractional part representing the milliseconds):

var seconds = parseInt((b-a)/1000);

然后，您可以通过划分获得整个分钟 秒乘以60并将其转换为整数，然后将小时除以分钟 60，并将其转换为整数，然后以相同的方式更长的时间单位。由此，可以创建一个获取下位单位值和余数下单位时间单位最大总量的函数：

You could then get whole minutes by dividing seconds by 60 and converting it to an integer, then hours by dividing minutes by 60 and converting it to an integer, then longer time units in the same way. From this, a function to get the maximum whole amount of a time unit in the value of a lower unit and the remainder lower unit can be created:

function get_whole_values(base_value, time_fractions) {
    time_data = [base_value];
    for (i = 0; i < time_fractions.length; i++) {
        time_data.push(parseInt(time_data[i]/time_fractions[i]));
        time_data[i] = time_data[i] % time_fractions[i];
    }; return time_data;
};
// Input parameters below: base value of 72000 milliseconds, time fractions are
// 1000 (amount of milliseconds in a second) and 60 (amount of seconds in a minute). 
console.log(get_whole_values(72000, [1000, 60]));
// -> [0,12,1] # 0 whole milliseconds, 12 whole seconds, 1 whole minute.

如果您想知道第二个 Date对象，请参阅以下名称：

If you're wondering what the input parameters provided above for the second Date object are, see their names below:

new Date(<year>, <month>, <day>, <hours>, <minutes>, <seconds>, <milliseconds>);

如解决方案的注释所述，您不一定需要提供所有这些值，除非它们对于您希望代表的日期是必要的。

As noted in the comments of this solution, you don't necessarily need to provide all these values unless they're necessary for the date you wish to represent.

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