检查DateTime值是否为今天，明天或晚些时候

Question

我有DateTime类的对象属性。

我如何理解保存日期是今天，明天还是以后？

Answer 1

以下是一些有用的方法来实现这一目标：

datetime = DateTime.now => Sun, 26 Oct 2014 21:00:00 

datetime.today? # => true 
datetime.to_date.past? # => false (only based on date) 
datetime.to_date.future? # => false (only based on date) 

datetime.to_date == Date.tomorrow # => false 
datetime.to_date == Date.yesterday # => false 

Answer 2

喜欢的东西...

datetime = Time.now.to_datetime 
=> Sun, 26 Oct 2014 16:24:55 -0600 

datetime >= Date.today 
=> true 

datetime < Date.tomorrow 
=> true 

datetime += 1.day 
=> Mon, 27 Oct 2014 16:25:12 -0600 

datetime >= Date.today 
=> true 

datetime >= Date.tomorrow 
=> true 

datetime < (Date.tomorrow + 1.day) 
=> false 

？