如何在 Ruby 中将时间四舍五入到最接近的 15 分钟? [英] How to round a time down to the nearest 15 minutes in Ruby?

问题描述

是否有一种简单的方法可以将时间四舍五入到最接近的 15 分钟?

Is there an easy way to round a Time down to the nearest 15 minutes?

这就是我目前正在做的事情.有没有更简单的方法?

This is what I'm currently doing. Is there an easier way to do it?

t = Time.new
rounded_t = Time.local(t.year, t.month, t.day, t.hour, t.min/15*15)

推荐答案

您说的是向下舍入"，所以我不确定您实际上是在寻找圆形还是地板，但这是同时执行这两种操作的代码.我认为，如果您将 round_off 和 floor 方法添加到 Time 类中，这样的内容会非常好读.额外的好处是您可以更轻松地按任何时间分区舍入.

You said "round down", so I'm not sure if you're actually looking for the round or the floor, but here's the code to do both. I think something like this reads really well if you add round_off and floor methods to the Time class. The added benefit is that you can more easily round by any time partition.

require 'active_support/core_ext/numeric' # from gem 'activesupport'

class Time
  # Time#round already exists with different meaning in Ruby 1.9
  def round_off(seconds = 60)
    Time.at((self.to_f / seconds).round * seconds).utc
  end

  def floor(seconds = 60)
    Time.at((self.to_f / seconds).floor * seconds).utc
  end
end

t = Time.now                    # => Thu Jan 15 21:26:36 -0500 2009
t.round_off(15.minutes)         # => Thu Jan 15 21:30:00 -0500 2009
t.floor(15.minutes)             # => Thu Jan 15 21:15:00 -0500 2009

注意: ActiveSupport 仅对于漂亮的 15.minutes 参数是必需的.如果您不想要这种依赖关系，请改用 15 * 60.

Note: ActiveSupport was only necessary for the pretty 15.minutes argument. If you don't want that dependency, use 15 * 60 instead.

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