我有一个像2014-12-22 05:54:34 UTC这样的ActiveSupport :: TimeWithZone实例，但我只想保留日期信息2014-12-22
我试过铁的to_formatted_s，但它对我不起作用。
<%= item.updated_at.to_formatted_s(:db) %>
显示：2014-12-22 05:54:34
答案 0 :(得分：5)
您可以使用strftime：
> date_time.strftime('%Y-%m-%d')
其中，
%Y - Year with century
%m - Month of the year (01..12)
%d - Day of the month (01-31)
答案 1 :(得分：1)
[7] pry(main)> Time.zone.now.is_a?(ActiveSupport::TimeWithZone)
=> true
[8] pry(main)> Time.zone.now.to_s
=> "2014-12-22 17:16:39 +1100"
[9] pry(main)> Time.zone.now.strftime("%Y-%m-%d")
=> "2014-12-22"
[11] pry(main)> Time.zone.now.strftime("%F")
=> "2014-12-22"
参见
http://www.ruby-doc.org/core-2.1.5/Time.html#method-i-strftime
答案 2 :(得分：0)
方法如下：
Time.current.strftime("%d %b %Y")
=> "11 Jan 2021"
Here 是完整列表：
%a - The abbreviated weekday name (“Sun”)
%A - The full weekday name (“Sunday”)
%b - The abbreviated month name (“Jan”)
%B - The full month name (“January”)
%c - The preferred local date and time representation
%d - Day of the month (01..31)
%H - Hour of the day, 24-hour clock (00..23)
%I - Hour of the day, 12-hour clock (01..12)
%j - Day of the year (001..366)
%m - Month of the year (01..12)
%M - Minute of the hour (00..59)
%p - Meridian indicator (“AM” or “PM”)
%S - Second of the minute (00..60)
%U - Week number of the current year, starting with the first Sunday as the first day of the first week (00..53)
%W - Week number of the current year, starting with the first Monday as the firstday of the first week (00..53)
%w - Day of the week (Sunday is 0, 0..6)
%x - Preferred representation for the date alone, no time
%X - Preferred representation for the time alone, no date
%y - Year without a century (00..99)
%Y - Year with century
%Z - Time zone name
%% - Literal “%” character