ruby-on-rails - Rails 得到两个日期之间的差异

Question

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Answer 1

您需要在 Rails 应用程序中添加帮助程序才能实现此目的。 Ruby 没有为此提供任何直接的方法。下面是使用 ruby​​ 2.1.0 的日期操作。

2.1.0 :021 > a_date_time = DateTime.now
 => Fri, 26 Dec 2014 16:39:30 +0530 # First Date
2.1.0 :022 > b_date_time = DateTime.now-20
 => Sat, 06 Dec 2014 16:40:03 +0530 # Second Date
2.1.0 :023 > (a_date_time - b_date_time).to_i
 => 19 # Direct date difference
2.1.0 :024 > Seconds = ((a_date_time - b_date_time)*24*60*60).to_i
 => 1727966 # Seconds between two dates
2.1.0 :025 > sec = Seconds % 60
 => 26 # Second diffence to print
2.1.0 :026 > Minutes = Seconds / 60
 => 28799 # Minutes between two dates
2.1.0 :027 > min = Minutes % 60
 => 59 # Minute diffence to print
2.1.0 :028 > Hours = Minutes / 60
 => 479 # Hours between two dates
2.1.0 :029 > hour = Hours % 24
 => 23 #Hour diffence to print
2.1.0 :030 > Days = Hours / 24
 => 19 # Days between two dates
2.1.0 :032 > Days.to_s + 'Days, ' + hour.to_s + 'Hours, '+ min.to_s + 'Mins, ' + sec.to_s + 'Secs'
 => "19Days, 23Hours, 59Mins, 26Secs" # Desired output