Rails的格式化日期

Question

我張貼的日期的API和所需的格式如下：

2014-12-01T01:29:18 

我可以從模型得到的日期，像這樣：

Model.created_at.to_s 

返回：

2014-12-01 01:29:18 -0500 

如何使用Rails或Ruby來格式化它，如使用T所需的格式並刪除-0500？

感謝

Answer 1

使用

Model.created_at.strftime("%FT%T") 

其中，

%F - The ISO 8601 date format (%Y-%m-%d) 
%T - 24-hour time (%H:%M:%S) 

以下是一些Date和Time格式，常用的有用的列表，你可以在指定的strftime方法：

Date (Year, Month, Day): 
    %Y - Year with century (can be negative, 4 digits at least) 
      -0001, 0000, 1995, 2009, 14292, etc. 
    %C - year/100 (round down. 20 in 2009) 
    %y - year % 100 (00..99) 

    %m - Month of the year, zero-padded (01..12) 
      %_m blank-padded (1..12) 
      %-m no-padded (1..12) 
    %B - The full month name (``January'') 
      %^B uppercased (``JANUARY'') 
    %b - The abbreviated month name (``Jan'') 
      %^b uppercased (``JAN'') 
    %h - Equivalent to %b 

    %d - Day of the month, zero-padded (01..31) 
      %-d no-padded (1..31) 
    %e - Day of the month, blank-padded (1..31) 

    %j - Day of the year (001..366) 

Time (Hour, Minute, Second, Subsecond): 
    %H - Hour of the day, 24-hour clock, zero-padded (00..23) 
    %k - Hour of the day, 24-hour clock, blank-padded (0..23) 
    %I - Hour of the day, 12-hour clock, zero-padded (01..12) 
    %l - Hour of the day, 12-hour clock, blank-padded (1..12) 
    %P - Meridian indicator, lowercase (``am'' or ``pm'') 
    %p - Meridian indicator, uppercase (``AM'' or ``PM'') 

    %M - Minute of the hour (00..59) 

    %S - Second of the minute (00..59) 

    %L - Millisecond of the second (000..999) 
    %N - Fractional seconds digits, default is 9 digits (nanosecond) 
      %3N millisecond (3 digits) 
      %6N microsecond (6 digits) 
      %9N nanosecond (9 digits) 
      %12N picosecond (12 digits) 

對於格式strftime方法完整列表請訪問APIDock

Answer 2

試試這個：

created_at.strftime('%FT%T') 

這是一個時間的格式化功能，爲您提供一種方式來呈現日期的字符串表示。 （http://ruby-doc.org/core-2.2.1/Time.html#method-i-strftime）。

從APIdock：

%Y%m%d   => 20071119     Calendar date (basic) 
%F    => 2007-11-19    Calendar date (extended) 
%Y-%m   => 2007-11     Calendar date, reduced accuracy, specific month 
%Y    => 2007      Calendar date, reduced accuracy, specific year 
%C    => 20      Calendar date, reduced accuracy, specific century 
%Y%j    => 2007323     Ordinal date (basic) 
%Y-%j   => 2007-323     Ordinal date (extended) 
%GW%V%u   => 2007W471     Week date (basic) 
%G-W%V-%u  => 2007-W47-1    Week date (extended) 
%GW%V   => 2007W47     Week date, reduced accuracy, specific week (basic) 
%G-W%V   => 2007-W47     Week date, reduced accuracy, specific week (extended) 
%H%M%S   => 083748     Local time (basic) 
%T    => 08:37:48     Local time (extended) 
%H%M    => 0837      Local time, reduced accuracy, specific minute (basic) 
%H:%M   => 08:37      Local time, reduced accuracy, specific minute (extended) 
%H    => 08      Local time, reduced accuracy, specific hour 
%H%M%S,%L  => 083748,000    Local time with decimal fraction, comma as decimal sign (basic) 
%T,%L   => 08:37:48,000    Local time with decimal fraction, comma as decimal sign (extended) 
%H%M%S.%L  => 083748.000    Local time with decimal fraction, full stop as decimal sign (basic) 
%T.%L   => 08:37:48.000    Local time with decimal fraction, full stop as decimal sign (extended) 
%H%M%S%z   => 083748-0600    Local time and the difference from UTC (basic) 
%T%:z   => 08:37:48-06:00   Local time and the difference from UTC (extended) 
%Y%m%dT%H%M%S%z => 20071119T083748-0600  Date and time of day for calendar date (basic) 
%FT%T%:z   => 2007-11-19T08:37:48-06:00 Date and time of day for calendar date (extended) 
%Y%jT%H%M%S%z => 2007323T083748-0600  Date and time of day for ordinal date (basic) 
%Y-%jT%T%:z  => 2007-323T08:37:48-06:00 Date and time of day for ordinal date (extended) 
%GW%V%uT%H%M%S%z => 2007W471T083748-0600  Date and time of day for week date (basic) 
%G-W%V-%uT%T%:z => 2007-W47-1T08:37:48-06:00 Date and time of day for week date (extended) 
%Y%m%dT%H%M  => 20071119T0837    Calendar date and local time (basic) 
%FT%R   => 2007-11-19T08:37   Calendar date and local time (extended) 
%Y%jT%H%MZ  => 2007323T0837Z    Ordinal date and UTC of day (basic) 
%Y-%jT%RZ  => 2007-323T08:37Z   Ordinal date and UTC of day (extended) 
%GW%V%uT%H%M%z => 2007W471T0837-0600  Week date and local time and difference from UTC (basic) 
%G-W%V-%uT%R%:z => 2007-W47-1T08:37-06:00 Week date and local time and difference from UTC (extended) 

Answer 3

在

environment.rb 

您可以添加這樣的事情：

Time::DATE_FORMATS[:custom_datetime] = "%d.%m.%Y" 

，然後用它以下窪Y：

post.updated_at.to_s(:custom_datetime) 

`

Answer 4

由於I18n是Rails核心功能從version 2.2開始，你可以使用它的localize - 方法。通過應用forementioned strftime %-variables可以指定config/locales/en.yml下所需的格式（或其他語言），你的情況是這樣的：

time: 
    formats: 
    default: '%FT%T' 

或者，如果你想使用這種格式在幾個特定的​​地方，你可以參考它是這樣

time: 
    formats: 
    specific_format: '%FT%T' 

變量之後，你可以在你的意見這樣使用它：

l(Mode.last.created_at, format: :specific_format)