如何获取Ruby on Rails中两个DateTimes之间的秒数 [英] How do I get the number of seconds between two DateTimes in Ruby on Rails

问题描述

我有代码可以为员工进行时间跟踪。它创建一个计数器来显示员工已经记录了多长时间。

这是当前的代码：

$ _ code> start_time = Time.parse（self.settings.first_clock_in）
total_seconds = Time.now - start_time
hours =（total_seconds / 3600）.to_i
minutes =（（total_seconds％3600）/ 60）.to_i
seconds =（（total_seconds％3600）％60）.to_i

这工作正常。但是由于时间限制在1970 - 2038年的范围之内，我们正试图用DateTimes替代所有Time的用途。我不知道如何获得两个DateTimes之间的秒数。减去它们产生一个我不知道如何解释的Rational，而减去Times产生差异。

解决方案

减法两个DateTimes返回以天为单位的经过时间，因此您可以执行以下操作：

  elapsed_seconds =（（end_time  -  start_time）* 24 * 60 * 60）.to_i 
  

I've got code that does time tracking for employees. It creates a counter to show the employee how long they have been clocked in for.

This is the current code:

  start_time = Time.parse(self.settings.first_clock_in)
  total_seconds = Time.now - start_time
  hours = (total_seconds/ 3600).to_i
  minutes = ((total_seconds % 3600) / 60).to_i
  seconds = ((total_seconds % 3600) % 60).to_i

This works fine. But because Time is limited to the range of 1970 - 2038 we are trying to replace all Time uses with DateTimes. I can't figure out how to get the number of seconds between two DateTimes. Subtracting them yields a Rational which I don't know how to interpret, whereas subtracting Times yields the difference in seconds.

解决方案

Subtracting two DateTimes returns the elapsed time in days, so you could just do:

elapsed_seconds = ((end_time - start_time) * 24 * 60 * 60).to_i

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