ruby-on-rails - 如何区分两个 Time.now.utc.iso8601？

Question

我有 ：

last_transition_date = Time.now.utc.iso8601()

……

x = Time.now.utc.iso8601() - last_transition_date

但它给出了错误：

“2012-05-28T10:50:13Z”的“未定义方法‘-’：字符串’

解决方案？！

Answer 1

你应该做

last_transition_date = Time.now.utc
x = Time.now.utc - last_transition_date

然后你会得到浮动结果

Answer 2

您正试图从另一个字符串中减去一个字符串。字符串没有-方法。