Ruby 时间规范化函数strftime使用大全

通过Time.new获取当前时间：

1.  t = Time.now  
2.  => 2013-09-12 22:49:27 +0530  

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

混合使用：

1.  t.strftime("%H:%M:%S")  
2.  => "22:49:27"  

所有方法：

For 'a' to 'z'

CODE	OUTPUT
t.strftime('%a')	=> Thu
t.strftime('%b')	=> Jan
t.strftime('%c')	=> Thu Jan 23 16:38:02 2014
t.strftime('%d')	=> 23
t.strftime('%e')	=> 23
t.strftime('%f')	=> %f # Not Useful
t.strftime('%g')	=> 14
t.strftime('%h')	=> Jan
t.strftime('%i')	=> %i # Not Useful
t.strftime('%j')	=> 023
t.strftime('%k')	=> 16
t.strftime('%l')	=> 4
t.strftime('%m')	=> 01
t.strftime('%n')	=> # Not Useful
t.strftime('%o')	=> %o
t.strftime('%p')	=> PM
t.strftime('%q')	=> %q
t.strftime('%r')	=> 04:38:02 PM
t.strftime('%s')	=> 1390475282
t.strftime('%t')	=> # Not Useful
t.strftime('%u')	=> 4
t.strftime('%v')	=> 23-JAN-2014
t.strftime('%w')	=> 4
t.strftime('%x')	=> 01/23/14
t.strftime('%y')	=> 14
t.strftime('%z')	=> +0530

For 'A' to 'Z'

CODE	OUTPUT
t.strftime('%A')	=> Thursday
t.strftime('%B')	=> January
t.strftime('%C')	=> 20
t.strftime('%D')	=> 01/23/14
t.strftime('%E')	=> %E # Not Useful
t.strftime('%F')	=> 2014-01-23
t.strftime('%G')	=> 2014
t.strftime('%H')	=> 16
t.strftime('%I')	=> 04
t.strftime('%J')	=> %J # Not Useful
t.strftime('%K')	=> %K # Not Useful
t.strftime('%L')	=> 485
t.strftime('%M')	=> 38
t.strftime('%N')	=> 485141000
t.strftime('%O')	=> %O # Not Useful
t.strftime('%P')	=> pm
t.strftime('%Q')	=> %Q # Not Useful
t.strftime('%R')	=> 16:38
t.strftime('%S')	=> 02
t.strftime('%T')	=> 16:38:02
t.strftime('%U')	=> 03
t.strftime('%V')	=> 04
t.strftime('%W')	=> 03
t.strftime('%X')	=> 16:38:02
t.strftime('%Y')	=> 2014
t.strftime('%Z')	=> IST