Ruby strftime: Month without leading zero?

Some versions of strftime do allow prefixing with minus to format out leading zeros, for eg:

strftime "%-d/%-m/%y"

However this will depend on strftime on your system. So for consistency I would do something like this instead:

dt = Time.local(2010, 'Sep', 1)printf "%d/%d/%d", dt.day, dt.month, dt.year

Here's the formatting list I go off of. This is from the docs for 2.1.3. According to this you would want %-m:

Date (Year, Month, Day):  %Y - Year with century (can be negative, 4 digits at least)          -0001, 0000, 1995, 2009, 14292, etc.  %C - year / 100 (rounded down such as 20 in 2009)  %y - year % 100 (00..99)  %m - Month of the year, zero-padded (01..12)          %_m  blank-padded ( 1..12)          %-m  no-padded (1..12)  %B - The full month name (``January'')          %^B  uppercased (``JANUARY'')  %b - The abbreviated month name (``Jan'')          %^b  uppercased (``JAN'')  %h - Equivalent to %b  %d - Day of the month, zero-padded (01..31)          %-d  no-padded (1..31)  %e - Day of the month, blank-padded ( 1..31)  %j - Day of the year (001..366)Time (Hour, Minute, Second, Subsecond):  %H - Hour of the day, 24-hour clock, zero-padded (00..23)  %k - Hour of the day, 24-hour clock, blank-padded ( 0..23)  %I - Hour of the day, 12-hour clock, zero-padded (01..12)  %l - Hour of the day, 12-hour clock, blank-padded ( 1..12)  %P - Meridian indicator, lowercase (``am'' or ``pm'')  %p - Meridian indicator, uppercase (``AM'' or ``PM'')  %M - Minute of the hour (00..59)  %S - Second of the minute (00..60)  %L - Millisecond of the second (000..999)       The digits under millisecond are truncated to not produce 1000.  %N - Fractional seconds digits, default is 9 digits (nanosecond)          %3N  millisecond (3 digits)          %6N  microsecond (6 digits)          %9N  nanosecond (9 digits)          %12N picosecond (12 digits)          %15N femtosecond (15 digits)          %18N attosecond (18 digits)          %21N zeptosecond (21 digits)          %24N yoctosecond (24 digits)       The digits under the specified length are truncated to avoid       carry up.Time zone:  %z - Time zone as hour and minute offset from UTC (e.g. +0900)          %:z - hour and minute offset from UTC with a colon (e.g. +09:00)          %::z - hour, minute and second offset from UTC (e.g. +09:00:00)  %Z - Abbreviated time zone name or similar information.Weekday:  %A - The full weekday name (``Sunday'')          %^A  uppercased (``SUNDAY'')  %a - The abbreviated name (``Sun'')          %^a  uppercased (``SUN'')  %u - Day of the week (Monday is 1, 1..7)  %w - Day of the week (Sunday is 0, 0..6)ISO 8601 week-based year and week number:The first week of YYYY starts with a Monday and includes YYYY-01-04.The days in the year before the first week are in the last week ofthe previous year.  %G - The week-based year  %g - The last 2 digits of the week-based year (00..99)  %V - Week number of the week-based year (01..53)Week number:The first week of YYYY that starts with a Sunday or Monday (according to %Uor %W). The days in the year before the first week are in week 0.  %U - Week number of the year. The week starts with Sunday. (00..53)  %W - Week number of the year. The week starts with Monday. (00..53)Seconds since the Epoch:  %s - Number of seconds since 1970-01-01 00:00:00 UTC.Literal string:  %n - Newline character (\n)  %t - Tab character (\t)  %% - Literal ``%'' characterCombination:  %c - date and time (%a %b %e %T %Y)  %D - Date (%m/%d/%y)  %F - The ISO 8601 date format (%Y-%m-%d)  %v - VMS date (%e-%^b-%4Y)  %x - Same as %D  %X - Same as %T  %r - 12-hour time (%I:%M:%S %p)  %R - 24-hour time (%H:%M)  %T - 24-hour time (%H:%M:%S)

Updated to latest 2.1.3 docs on 10/24/14

Docs show a number of different options for configuring number format. Adding to the %-d format, you can also use these flags in place of "-":

Flags:  -  don't pad a numerical output.  _  use spaces for padding.  0  use zeros for padding.  ^  upcase the result string.  #  change case.  :  use colons for %z.