Rails的日期出了什么问题

Question

今天早上我在Rails 3.2控制台遇到了这个无意义的问题.我在MacOS 10.10下,我的时区是+7.

Loading development environment (Rails 3.2.12)
irb(main):001:0> Date.today
=> Sun, 16 Nov 2014
irb(main):002:0> Date.yesterday
=> Fri, 14 Nov 2014
irb(main):003:0>

原始Ruby Date的一切都很好:

irb(main):006:0> Date.today
=> #<Date: 2014-11-16 ((2456978j,0s,0n),+0s,2299161j)>
irb(main):007:0> Date.today.prev_day
=> #<Date: 2014-11-15 ((2456977j,0s,0n),+0s,2299161j)>
irb(main):008:0>

Answer 1

从这里的错误报告:https://rails.lighthouseapp.com/projects/8994/tickets/6410#ticket-6410-8

这是一个微妙的 - Date.yesterday使用Date.current,它将使用时区,而Date.today不使用.如果你将你的时区设置为明天的时区(例如我输入的欧洲/柏林),那么你可以获得Date.today == Date.yesterday:

Time.zone ="Europe/London"=>"Europe/London"Date.today == Date.yesterday => false

Time.zone ="Europe/Berlin"=>"Europe/Berlin"Date.today == Date.yesterday => true