[Rails] 日期時間顯示方式

## [path] Date
db:‘%Y-%m-%d’   2008-08-20
long_ordinal:‘&proc’      August 20th, 2008
long:‘%B %e, %Y’  August 20, 2008
rfc822:‘%e %b %Y’   20 Aug 2008
number:‘%Y%m%d’     20080820
short:‘%e %b’      20 Aug

## [path] DateTime
db:‘%Y-%m-%d’   2008-08-20 16:56:21
long_ordinal:‘&proc’      August 20th, 2008 16:56
long:‘%B %e, %Y’  August 20, 2008 16:56
rfc822:‘%e %b %Y’   Wed, 20 Aug 2008 16:56:21 -0600
number:‘%Y%m%d’     20080820165621
short:‘%e %b’      20 Aug 16:56

## [path] Time
db:‘%Y-%m-%d %H:%M:%S’         2008-08-20 16:56:21
long_ordinal:‘&proc’           August 20th, 2008 16:56
long:‘%B %d, %Y %H:%M’           August 20, 2008 16:56
rfc822:‘%a, %d %b %Y %H:%M:%S %z’  Wed, 20 Aug 2008 16:56:21 -0600
short:‘%d %b %H:%M’               20 Aug 16:56
number:‘%Y%m%d%H%M%S’              20080820165621
time:‘%H:%M’                     16:56

for example:

News.to_s(:db)
News.created_at.strftime("%B %d, %Y %H:%M")

參考

1. http://stackoverflow.com/questions/3042801/transforming-datetime-into-month-day-and-year