ruby-on-rails 在Ruby on Rails中将DateTime转换为简单日期

j8ag8udp 于 2023-03-13 发布在 Ruby

关注(0)|答案(6)|浏览(159)

我在DB中有一个datetime列，当我向用户显示它时，我想将它转换为一个简单的日期。
我该怎么做呢？

def shown_date
  # to_date does not exist, but is what I am looking for
  self.date || self.exif_date_time_original.to_date 
end

ruby-on-rails

来源：https://stackoverflow.com/questions/1110411/transform-datetime-into-simple-date-in-ruby-on-rails

6条答案

按热度按时间

5rgfhyps1#

DateTime#to_date确实存在于ActiveSupport中：

$ irb
>> DateTime.new.to_date
NoMethodError: undefined method 'to_date' for #<DateTime: -1/2,0,2299161>
    from (irb):1

>> require 'active_support/core_ext'
=> true

>> DateTime.new.to_date
=> Mon, 01 Jan -4712

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tkqqtvp12#

你好colimarco：）你可以使用rubystrftime方法来创建你自己的日期/时间显示。

时间。字符串时间（字符串）=〉字符串 *

%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 first
          day 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

   t = Time.now
   t.strftime("Printed on %m/%d/%Y")   #=> "Printed on 04/09/2003"
   t.strftime("at %I:%M%p")            #=> "at 08:56AM"

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thigvfpy3#

在Ruby 1.9.2及更高版本中，他们为DateTime添加了.to_date函数：
http://ruby-doc.org/stdlib-1.9.2/libdoc/date/rdoc/DateTime.html#method-i-to_date
这个示例方法在1.8.7等早期版本中似乎没有出现。

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2fjabf4q4#

对于旧版Ruby（1.8.x）：