[程式] Rails - Time Method & Output Format

Time Method - .created_at & .updated_at

• Format
  %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)
  %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
• 利用".strftime(...)"可設定顯示格式
  <...>.created_at.strftime("%Y/%d/%m")                  ＃output: 2013/11/28
  <...>.updated_at.strftime("%y-%d-%m %H:%M")   ＃output: 13-11-28 24:00

Ref: http://techoctave.com/c7/posts/23-rails-date-formats