我需要计算两个日期对象之间的经过时间 [英] I need to calculate an elapsed time between two date objects

问题描述

我有一个从保存在数据库中的变种创建的日期对象。

I have a date object created from vars saved in a database.

var prevTime = Date(year,month,day,hour,minute);

我想计算这与当前时间之间的差异。

I want to calculate the difference between this and the current time.

var thisTime = Date();

我这样做：

prevTime.getTime() - thisTime.getTime();

它给出了一个非常大的负数。我除以1000得到秒，然后除以3600得到几小时。我需要一个小时的经过时间。我最终得到一个像-756.00的数字。如果当前时间大于前一次，为什么数字为负数？我做错了什么？

It gives me a negative number that is very large. I divide by 1000 to get seconds and then divide by 3600 to get hours. I need an elapsed time in hours. I end up with a number that is like -756.00. If the current time is larger than the previous time, why is the number negative? What am I doing wrong?

谢谢，

Scott

推荐答案

当前时间大于上一次，因此从较小的数字中减去较大的数字会得到一个负数。如果您想要时间的正差异，请撤消订单。还有更多的问题吗？

The current time is larger than the previous time so subtracting a larger number from a smaller number gives you a negative number. Reverse the order if you want the positive difference in times. Is there more to the question than that?

这里示范： http://jsfiddle.net/jfriend00/NYSsp/

var prevTime = new Date(2011,1,1,0,0);  // Feb 1, 2011
var thisTime = new Date();              // now
var diff = thisTime.getTime() - prevTime.getTime();   // now - Feb 1
alert(diff / (1000*60*60*24));     // positive number of days

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