Ruby strftime: Month without leading zero ?

Ruby strftime: Month without leading zero ?

Asked on December 22, 2018 in Ruby.
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  • 7 Answer(s)

    Actually, only the few versions of strftime do allow prefixing with minus to format out  zeros lead.

    Here is an example,

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

    This depend on strftime on the user system. So for stability do this additionally:

    dt = Time.local(2010, 'Sep', 1)
    printf "%d/%d/%d", dt.day, dt.month, dt.year
    
    Answered on December 22, 2018.
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    There is lot of ways to configuring number format. Use these flags in place of  “-” we should add to the %-d format,

    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.
    
    Answered on December 22, 2018.
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    One can easily got the solution of this question. If some errors occurs just converting strftime(“%m”) into an integer like this,

    converting strftime("%m") into an integer
    
    
    Answered on December 22, 2018.
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    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)
    Answered on May 20, 2019.
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    date_time.strftime("%d/%m/%y")
    result: 04/01/11 
    Answered on May 20, 2019.
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    date_time.strftime("%e/%m/%y")
    result: 
    Answered on May 20, 2019.
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    date_time.strftime("#{date_time.day}/%m/%y")
    Answered on May 20, 2019.
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