I have 2 dates and difference between them can be over a month. I want to find a difference between them in day. However, b.days - a.days turns a blind eye to to the months and, possibly, years too.
我有两个日期，他们之间的差异可能超过一个月。我想在白天找到它们之间的区别。然而，b.days - a.days对这几个月甚至几年也视而不见。
require 'date'
a = Date.parse("20141030")
b = Date.parse("20141230")
b.day - a.day #=> 0
What's the easier way to find such a difference?
找到这种差异的更简单方法是什么？
1 个解决方案
#1
3
Just subtract the one from the other:
只需从另一个中减去一个：
(b - a)
# => (61/1)
(b - a).to_i
# => 61
The reason you got 0 is b.day and a.day returns day of the month: 30. (30 - 30 = 0)
你得到0的原因是b.day和a.day返回月份的日期：30。（30 - 30 = 0）
b.day
# => 30
a.day
# => 30
#1
3
Just subtract the one from the other:
只需从另一个中减去一个：
(b - a)
# => (61/1)
(b - a).to_i
# => 61
The reason you got 0 is b.day and a.day returns day of the month: 30. (30 - 30 = 0)
你得到0的原因是b.day和a.day返回月份的日期：30。（30 - 30 = 0）
b.day
# => 30
a.day
# => 30