Formatting Time
Learn how to use the trusty strftime method to format a time, and see how Rails allows you to save this format for later use.
学习如何适用strftime方法格式化时间，并且看看rails如何实现保存这个格式，以备再用。
---可参看我的另一篇文章rails中的时间显示格式
<%= time.to_s(:lang)%>
=>May 15, 2007 08:00
<%= time.to_s(:short)%>
=>15, May 08:00
<%= time.to_s(:db)%>
=>2007-05-15 08:00:00
但是还是不如customize格式化时间显示好用：
用ri Time.strftime命令可以查看这个方法的使用帮助。
----
---------------------------------------------------------- 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.
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 date and time representation
%d - Day of the month (01..31)
%H - Hour of the day, 24-hour clock (00..23)
%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
%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)
%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"
t.strftime("Printed on %m/%d/%Y") #=> "Printed on 04/09/2003"
t.strftime("at %I:%M%p") #=> "at 08:56AM"
这就是ri出来的文档
本文转自 fsjoy1983 51CTO博客，原文链接：http://blog.51cto.com/fsjoy/132057，如需转载请自行联系原作者