使用 Ruby on Rails 格式化日期 [英] Format the date using Ruby on Rails

问题描述

flickr api 提供发布日期作为 unix 时间戳一:发布日期始终作为 unix 时间戳传递，这是一个无符号整数，指定自格林威治标准时间 1970 年 1 月 1 日以来的秒数."

The flickr api provides a posted date as unix timestamp one: "The posted date is always passed around as a unix timestamp, which is an unsigned integer specifying the number of seconds since Jan 1st 1970 GMT."

例如，这里是日期1100897479".如何使用 Ruby on Rails 对其进行格式化?

For example, here is the date '1100897479'. How do I format it using Ruby on Rails?

推荐答案

一旦你解析了时间戳字符串并有一个时间对象(详见其他答案)，你可以使用 Time.to_formatted_s 来自 Rails.它内置了多种格式，您可以使用符号指定这些格式.

Once you have parsed the timestamp string and have a time object (see other answers for details), you can use Time.to_formatted_s from Rails. It has several formats built in that you can specify with symbols.

引用:

time = Time.now                     # => Thu Jan 18 06:10:17 CST 2007

time.to_formatted_s(:time)          # => "06:10"
time.to_s(:time)                    # => "06:10"

time.to_formatted_s(:db)            # => "2007-01-18 06:10:17"
time.to_formatted_s(:number)        # => "20070118061017"
time.to_formatted_s(:short)         # => "18 Jan 06:10"
time.to_formatted_s(:long)          # => "January 18, 2007 06:10"
time.to_formatted_s(:long_ordinal)  # => "January 18th, 2007 06:10"
time.to_formatted_s(:rfc822)        # => "Thu, 18 Jan 2007 06:10:17 -0600"

(Time.to_s 是别名)

(Time.to_s is an alias)

您也可以定义自己的格式 - 通常在初始化程序中(感谢 Dave Newton 指出这一点).做法是这样的:

You can also define your own formats - usually in an initializer (Thanks to Dave Newton for pointing this out). This is how it's done:

# config/initializers/time_formats.rb
Time::DATE_FORMATS[:month_and_year] = "%B %Y"
Time::DATE_FORMATS[:short_ordinal] = lambda { |time| time.strftime("%B #{time.day.ordinalize}") }

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