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* ext/date/date_core.c: replaced doc for strftime based on Time's one. 

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32010 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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tadf 2011-06-11 13:32:43 +00:00
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@ -1,3 +1,7 @@
Sat Jun 11 22:30:53 2011 Tadayoshi Funaba <tadf@dotrb.org>
* ext/date/date_core.c: replaced doc for strftime based on Time's one.
Sat Jun 11 22:07:56 2011 Tadayoshi Funaba <tadf@dotrb.org>
* ext/date/date_core.c (datetime_s_{iso8601,rfc3339,xmlschema,rfc2822,httpdate}):

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ext/date/date_core.c
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@ -6544,7 +6544,175 @@ date_strftime_internal(int argc, VALUE *argv, VALUE self,
* call-seq:
* d.strftime([format="%F"]) -> string
*
* Formats the date with the given template.
* Formats date according to the directives in the given format
* string.
* The directives begins with a percent (%) character.
* Any text not listed as a directive will be passed through to the
* output string.
*
* The directive consists of a percent (%) character,
* zero or more flags, optional minimum field width,
* optional modifier and a conversion specifier
* as follows.
*
* %<flags><width><modifier><conversion>
*
* 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.
*
* The minimum field width specifies the minimum width.
*
* The modifier is "E" and "O".
* They are ignored.
*
* Format directives:
*
* Date (Year, Month, Day):
* %Y - Year with century (can be negative, 4 digits at least)
* -0001, 0000, 1995, 2009, 14292, etc.
* %C - year / 100 (round down. 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)
* %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)
*
* 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 - hour, minute and second offset from UTC
* (e.g. +09, +09:30, +09:30:30)
* %Z - Time zone abbreviation name
*
* 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 week 1 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 week 1 of YYYY 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-%Y)
* %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)
* %+ - date(1) (%a %b %e %H:%M:%S %Z %Y)
*
* This method is similar to strftime() function defined in ISO C and POSIX.
* Several directives (%a, %A, %b, %B, %c, %p, %r, %x, %X, %E*, %O* and %Z)
* are locale dependent in the function.
* However this method is locale independent.
* So, the result may differ even if a same format string is used in other
* systems such as C.
* It is good practice to avoid %x and %X because there are corresponding
* locale independent representations, %D and %T.
*
* Examples:
*
* d = DateTime.new(2007,11,19,8,37,48,"-06:00")
* #=> #<DateTime: 2007-11-19 08:37:48 -0600 ...>
* d.strftime("Printed on %m/%d/%Y") #=> "Printed on 11/19/2007"
* d.strftime("at %I:%M%p") #=> "at 08:37AM"
*
* Various ISO 8601 formats:
* %Y%m%d => 20071119 Calendar date (basic)
* %F => 2007-11-19 Calendar date (extended)
* %Y-%m => 2007-11 Calendar date, reduced accuracy, specific month
* %Y => 2007 Calendar date, reduced accuracy, specific year
* %C => 20 Calendar date, reduced accuracy, specific century
* %Y%j => 2007323 Ordinal date (basic)
* %Y-%j => 2007-323 Ordinal date (extended)
* %GW%V%u => 2007W471 Week date (basic)
* %G-W%V-%u => 2007-W47-1 Week date (extended)
* %GW%V => 2007W47 Week date, reduced accuracy, specific week (basic)
* %G-W%V => 2007-W47 Week date, reduced accuracy, specific week (extended)
* %H%M%S => 083748 Local time (basic)
* %T => 08:37:48 Local time (extended)
* %H%M => 0837 Local time, reduced accuracy, specific minute (basic)
* %H:%M => 08:37 Local time, reduced accuracy, specific minute (extended)
* %H => 08 Local time, reduced accuracy, specific hour
* %H%M%S,%L => 083748,000 Local time with decimal fraction, comma as decimal sign (basic)
* %T,%L => 08:37:48,000 Local time with decimal fraction, comma as decimal sign (extended)
* %H%M%S.%L => 083748.000 Local time with decimal fraction, full stop as decimal sign (basic)
* %T.%L => 08:37:48.000 Local time with decimal fraction, full stop as decimal sign (extended)
* %H%M%S%z => 083748-0600 Local time and the difference from UTC (basic)
* %T%:z => 08:37:48-06:00 Local time and the difference from UTC (extended)
* %Y%m%dT%H%M%S%z => 20071119T083748-0600 Date and time of day for calendar date (basic)
* %FT%T%:z => 2007-11-19T08:37:48-06:00 Date and time of day for calendar date (extended)
* %Y%jT%H%M%S%z => 2007323T083748-0600 Date and time of day for ordinal date (basic)
* %Y-%jT%T%:z => 2007-323T08:37:48-06:00 Date and time of day for ordinal date (extended)
* %GW%V%uT%H%M%S%z => 2007W471T083748-0600 Date and time of day for week date (basic)
* %G-W%V-%uT%T%:z => 2007-W47-1T08:37:48-06:00 Date and time of day for week date (extended)
* %Y%m%dT%H%M => 20071119T0837 Calendar date and local time (basic)
* %FT%R => 2007-11-19T08:37 Calendar date and local time (extended)
* %Y%jT%H%MZ => 2007323T0837Z Ordinal date and UTC of day (basic)
* %Y-%jT%RZ => 2007-323T08:37Z Ordinal date and UTC of day (extended)
* %GW%V%uT%H%M%z => 2007W471T0837-0600 Week date and local time and difference from UTC (basic)
* %G-W%V-%uT%R%:z => 2007-W47-1T08:37-06:00 Week date and local time and difference from UTC (extended)
*
* See also strftime(3) and strptime.
*/