Rails宝典之第三十一式: format time

最新推荐文章于 2022-04-11 21:06:05 发布

最新推荐文章于 2022-04-11 21:06:05 发布 · 106 阅读

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本文详细介绍了如何使用Time.strftime进行时间格式化，包括各种格式指令如%A、%B、%I等的具体含义及应用实例，并展示了如何在环境中定义自定义的时间格式。

我们经常要用到时间的格式化，我们可以使用ri来看看reference doc.
[code]
ri Time.strftime
[/code]
结果显示如下:
[code]
------------------------------------------------------- Time#strftime
time.strftime( string ) => string
---------------------------------------------------------------------
Formats _time_ according to the directives in the given format
string. Any text not listed as a directive will be passed through
to the output string.

Format meaning:

%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 data 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"
[/code]
非常详细的参数文档。

我们在environment.rb里定义如下内容:
[code]
Time::DATE_FORMATS[:due_time] = "due at %B %d on %I:%M %p"
[/code]
然后，我们就可以在页面中像使用to_s(:db)一样使用:due_time了:
[code]
<%= task.due_at.to_s(:due_time) %>
[/code]