Rails 格式化日期

我正在张贴一个日期到一个 API 和所需的格式如下:

2014-12-01T01:29:18

我可以从模特那里得到日期，像这样:

Model.created_at.to_s

结果是:

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

How can I use Rails or Ruby to format it like the required format with the T and removing the -0500?

218819 次浏览
小开

试试这个:

created_at.strftime('%FT%T')

这是一个时间格式化函数，它提供了一种方法来表示日期的字符串表示形式。

来自 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)
小开
最佳答案

使用

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

在哪里,

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

以下是一些经常使用的 Date和 Time格式的列表，您可以在 strftime方法中指定:

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)

有关 strftime方法的 完整清单格式，请访问 APIDock

小开

为它创建一个初始化程序:

# config/initializers/time_formats.rb

再加上这样的内容:

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

然后按照下面的方式使用它:

post.updated_at.to_s(:custom_datetime)

Something 必须重新启动 Rails 服务器才能正常工作。

有关详细信息，请查阅文档: Http://api.rubyonrails.org/v5.1/classes/datetime.html#method-i-to_formatted_s

小开

由于 I18n是从 版本2.2开始的 Rails 核心特性，所以您可以使用它的 本地化方法。通过应用上面提到的 Strftime%-变量，你可以在 config/locales/en.yml(或任何语言)下指定所需的格式，如下所示:

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

或者，如果你想在一些特定的地方使用这种格式，你可以像这样把它称为一个变量

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

然后你可以像这样在你的视图中使用它:

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

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