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Ruby 1.8.7与1.9的strftime有点小区别

本来准备记下一份备查的,居然两个版本还有点小区别.大家来找碴吧^ ^

strftime: Ruby 1.8.7

%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

 t = Time.now
 t.strftime("Printed on %m/%d/%Y")   #=> "Printed on 04/09/2003"
 t.strftime("at %I:%M%p")            #=> "at 08:56AM"

Ruby 1.9

%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)
%F - Equivalent to %Y-%m-%d (the ISO 8601 date format)
%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)
%L - Millisecond of the second (000..999)
%m - Month of the year (01..12)
%M - Minute of the hour (00..59)
%N - Fractional seconds digits, default is 9 digits (nanosecond)
        %3N  millisecond (3 digits)
        %6N  microsecond (6 digits)
        %9N  nanosecond (9 digits)
%p - Meridian indicator (``AM''  or  ``PM'')
%P - Meridian indicator (``am''  or  ``pm'')
%s - Number of seconds since 1970-01-01 00:00:00 UTC.
%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                        #=> 2007-11-19 08:37:48 -0600
 t.strftime("Printed on %m/%d/%Y")   #=> "Printed on 11/19/2007"
 t.strftime("at %I:%M%p")            #=> "at 08:37AM"