获取两个日期对象之间的时差? [英] Get the hours difference between two date objects?

问题描述

尝试从更改此功能吗?/a>以小时为单位(而不是几天)返回差额，但到目前为止没有运气.=)

Trying to change this function from Get difference between 2 dates in javascript? to return difference in hours instead of days, but no luck so far. =)

function dateDiffInDays(scheduled, due) {
    var _MS_PER_DAY = 1000 * 60 * 60 * 24;
    var scheduled = new Date(scheduled);
    var due = new Date(due);
    var utc1 = Date.UTC(scheduled.getFullYear(), scheduled.getMonth(), scheduled.getDate());
    var utc2 = Date.UTC(due.getFullYear(), due.getMonth(), due.getDate());
    return Math.floor((utc2 - utc1) / _MS_PER_DAY);
}

将 _MS_PER_DAY 更改为 1000 * 60 * 60 ，但是返回零将不起作用.请帮忙.

Changed _MS_PER_DAY to 1000 * 60 * 60, but it wont work returning zeros. Please help.

计划值和到期时间，格式为:"2014年9月21日上午09:00:00"

values of schedule and due in this format: "09/21/2014 09:00:00 am"

推荐答案

在您的问题中，这些行是:

In your question, these lines:

var utc1 = Date.UTC(scheduled.getFullYear(), scheduled.getMonth(), scheduled.getDate());
var utc2 = Date.UTC(due.getFullYear(), due.getMonth(), due.getDate());

清理小时/分钟/等.日期中的信息，因此，如果两个日期都在同一天，则结果将始终为零.

Scrub the hour/minute/etc. information from the dates, so if the two dates fall on the same day, the result will always be zero.

可以使用更简单的函数来获取小时数差异(以十进制数表示):

A much simpler function can be used to get the difference in hours (as a decimal number):

function dateDiffInHours(date1, date2) {
    var msDiff = date2.getTime() - date1.getTime();
    return msDiff / 3600000;
}

或者如果您希望将其作为四舍五入的整数，则将 Math.round()或 Math.floor()应用于返回的结果.

Or if you want it as a rounded/floored int, then apply Math.round() or Math.floor() to the returned result.

完全不必转换为UTC.

Converting to UTC at all is unnecessary.

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