Rails datetime_select将当前时间以UTC格式发布 [英] Rails datetime_select posting my current time in UTC

问题描述

我试图将用户选择的开始日期和结束日期与当前时间进行比较，以防止用户选择过去的时间。它工作，除非你必须选择一个时间，在我的情况下，提前4个小时，以便它通过验证。

查看：

  datetime_select（：start_date，ampm：true） 
  

控制器：

 code> if self.start_date< DateTime.now || self.end_date< DateTime.now 
 errors.add（：date，'不能在过去'）
 end 
  

self.start_date 正在返回我当前的时间，但在utc中是错误的。 DateTime.now 正在返回我当前的时间，但偏移量为-0400，这是正确的。

示例： / p>

我目前的时间是2013-10-03 09：00：00.000000000 -04：00

self.start_date是2013-10-03 09：00：00.000000000 Z

DateTime.now是2013-10-03 09：00：00.000000000 -04：00

为什么会发生这种情况，什么是最好的方法来解决它？

解决方案

我最后通过将start_date转换为字符串并回到时间来修复它。这是奇怪的，我需要：local ，因为on_time上的文档表示它是默认的，但只有当它存在时才有效。

  def not_past_date 
 
 current_time = DateTime.now 
 start_date_selected = self.start_date.to_s.to_time（：local）
 end_date_selected = self.start_date.to_s.to_time（：local）
 
如果start_date_selected< current_time || end_date_selected< current_time 
 errors.add（：date，'不能在过去'）
 end 
 end 
  

I'm trying to compare what the user selects for a start date and end date to the current time to prevent the user from selecting a time in the past. It works except you have to pick a time, in my case, 4 hours ahead in order for it to pass the validation.

View:

datetime_select(:start_date, ampm: true)

Controller:

if self.start_date < DateTime.now || self.end_date < DateTime.now
  errors.add(:date, 'can not be in the past.')
end

self.start_date is returning my current time but in utc which is wrong. DateTime.now is returning my current time but with an offset of -0400 which is correct.

Example:

My current time is 2013-10-03 09:00:00.000000000 -04:00

self.start_date is 2013-10-03 09:00:00.000000000 Z

DateTime.now is 2013-10-03 09:00:00.000000000 -04:00

Why is this happening and what would be the best way to fix it?

解决方案

I ended up fixing it by converting the start_date to a string and back to time. It was weird that I needed :local, as the documentation on to_time says it is the default, but it only works when it is present.

def not_past_date

  current_time = DateTime.now
  start_date_selected = self.start_date.to_s.to_time(:local)
  end_date_selected = self.start_date.to_s.to_time(:local)

  if start_date_selected < current_time || end_date_selected < current_time
    errors.add(:date, 'can not be in the past.')
  end
end

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