在 Rails 3 中，如何解析 ISO8601 日期字符串以获取 TimeWithZone 实例？

Question

这是我的解决方案。有没有更紧凑的？

> time_from_client = "2001-03-30T19:00:00-05:00"
 => "2001-03-30T19:00:00-05:00" 

> time_from_client.to_datetime
 => Fri, 30 Mar 2001 19:00:00 -0500 

> timezone_offset = time_from_client.to_datetime.offset.numerator
 => -5 

> tz = ActiveSupport::TimeZone[timezone_offset]
 => (GMT-05:00) America/New_York

> tz.class
=> ActiveSupport::TimeZone 

Answer 1

查看的文档ActiveSupport::TimeWithZone。简短回答：使用Time.parse(time_string).in_time_zone：

[9] pry(main)> Time.parse("2001-03-30T19:00:00-05:00")
=> 2001-03-30 19:00:00 -0500
[10] pry(main)> Time.parse("2001-03-30T19:00:00-05:00").class
=> Time
[11] pry(main)> Time.parse("2001-03-30T19:00:00-05:00").in_time_zone
=> Sat, 31 Mar 2001 00:00:00 UTC +00:00
[12] pry(main)> Time.parse("2001-03-30T19:00:00-05:00").in_time_zone.class
=> ActiveSupport::TimeWithZone

如果您想要在另一个时区：

[13] pry(main)> Time.parse("2001-03-30T19:00:00-05:00").in_time_zone("America/Los_Angeles")
=> Fri, 30 Mar 2001 16:00:00 PST -08:00