Ruby strftime: ¿Mes sin cero?

Question

¿Tiene Ruby's strftime un formato para el mes sin un cero inicial?

Encontré %e para obtener el día sin el cero inicial, pero sin tener suerte con el mes.

querer última instancia una fecha formateada como: 9/1/2010

Answer 1

Algunas versiones de strftime no permitir que el prefijo con menos para dar formato a cabo ceros a la izquierda, por ejemplo:

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

Sin embargo, esto dependerá de strftime en tu sistema. Así que para mantener la coherencia me gustaría hacer algo como esto en su lugar:

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

Answer 2

Aquí está la lista de formato que vaya fuera de. Esto es de los documentos para 2.1.3. De acuerdo con esto, se quiere %-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 of 
the 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 %U 
or %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 ``%'' character 

Combination: 
    %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) 

Actualizado a las últimas 2.1.3 docs 10/24/14

Answer 3

tuve un problema similar y lo arregló mediante la conversión de strftime("%m") en un entero.

Por ejemplo:

strftime("%m")+0 give the current month as integer 'without leading zero' 

simple, aunque no elegante.

Answer 4

Los documentos muestran una serie de opciones diferentes para configurar el formato del número. Agregando al formato% -d, también puede usar estas banderas en lugar de "-":

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.