rails 中的 时间

rails中的时间显示格式

在rails中需要显示时间时,格式化时间的方法一般选用strftime,下面是关于strftime的一些介绍

 

strftime Format Codes

Year	Example
%Y	year with century	2007
%y	year without century	07
%C	century number (year divided by 100)	20
Month	Example
%B	full month name	January
%b	abbreviated month name	Jan
%h	same as %b	Jan
%m	month as number	(01-12)
Week	Example
%U	week number of the year, Sunday as first day of week	(00-53)
%W	week number of the year, Monday as first day of week	(00-53)
Day	Example
%A	full weekday name	Wednesday
%a	abbreviated weekday name	Wed
%d	day of the month	(01-31)
%e	day of the month, single digits preceded by space	( 1-31)
%j	day of the year	(001-366)
%w	weekday as a number, with 0 representing Sunday	(0-6)
%u	weekday as a number, with 1 representing Monday	(1-7)
Time	Example
%H	hour (24-hour clock)	(00-23)
%k	hour (24-hour clock); single digits preceded by space	( 0-23)
%I	hour (12-hour clock)	(01-12)
%l	hour (12-hour clock); single digits preceded by space	( 1-12)
%M	minute	(00-59)
%S	seconds	(00-59)
%p	either AM or PM	AM
%Z	timezone name or abbreviation	EDT
%z	timezone offset from UTC	-0400
Summaries	Example
%D	date, same as %m/%d/%y	05/16/07
%v	date, same as %e-%b-%Y	16-May-2007
%F	date, same as %Y-%m-%d	2007-05-16
%R	time, 24 hour notation, same as %H:%M	18:06
%T	time, 24 hour notation, same as %H:%M:%S	18:06:15
%r	time, am/pm notation, same as %I:%M:%S %p	06:06:15 PM
Formatting
%n	newline character
%t	tab character
%%	percent character
Less common formats
%s	number of seconds since the Epoch, UTC
%c	national date and time representation
%+	national date and time representation
%x	national date representation
%X	national time representation
%G	year with century, starting on first Monday where week has 4 or more days.
%g	year without century, starting on first Monday where week has 4 or more days.
%V	week number of the year, starting on first Monday where week has 4 or more days.

 

 

 

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格式化时间显示

<%= 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

------------------------------------------------------------------------
     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

       

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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当然，Agile web developing with rails 3rd 里P282上的时间也是比较全面的。