使用strftime获得具体的年份，月份或日期等等，常用：
CODE OUTPUT DESCRIPTION
t.strftime("%H") => "22" # Gives Hour of the time in 24 hour clock format
t.strftime("%I") => "10" # Gives Hour of the time in 12 hour clock format
t.strftime("%M") => "49" # Gives Minutes of the time
t.strftime("%S") => "27" # Gives Seconds of the time
t.strftime("%Y") => "2013" # Gives Year of the time
t.strftime("%m") => "09" # Gives month of the time
t.strftime("%d") => "12" # Gives day of month of the time
t.strftime("%w") => "4" # Gives day of week of the time
t.strftime("%a") => "Thu" # Gives name of week day in short form of the
t.strftime("%A") => "Thursday" # Gives week day in full form of the time
t.strftime("%b") => "Sep" # Gives month in short form of the time
t.strftime("%B") => "September" # Gives month in full form of the time
t.strftime("%y") => "13" # Gives year without century of the time
t.strftime("%Y") => "2013" # Gives year without century of the time
t.strftime("%Z") => "IST" # Gives Time Zone of the time
t.strftime("%p") => "PM" # Gives AM / PM of the time
# 2012-03-06 15:28:08
puts Time.now.strftime("%Y-%m-%d %H:%M:%S")
# 03/06/12 03:39 PM
puts Time.now.strftime("%x %I:%M %p")
原文出处：Netkiller 系列 手札
本文作者：陈景峯
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