--- /dev/null
+John Benediktsson
--- /dev/null
+
+USING: help.syntax help.markup kernel prettyprint sequences strings ;
+
+IN: time
+
+HELP: strftime
+{ $values { "format-string" string } }
+{ $description "Writes the timestamp (specified on the stack) formatted according to the format string." }
+;
+
+ARTICLE: "strftime" "Formatted timestamps"
+"The " { $vocab-link "time" } " vocabulary is used for formatted timestamps.\n"
+{ $subsection strftime }
+"\n"
+"Several format specifications exist for handling arguments of different types, and specifying attributes for the result string, including such things as maximum width, padding, and decimals.\n"
+{ $table
+ { "%a" "Abbreviated weekday name." }
+ { "%A" "Full weekday name." }
+ { "%b" "Abbreviated month name." }
+ { "%B" "Full month name." }
+ { "%c" "Date and time representation." }
+ { "%d" "Day of the month as a decimal number [01,31]." }
+ { "%H" "Hour (24-hour clock) as a decimal number [00,23]." }
+ { "%I" "Hour (12-hour clock) as a decimal number [01,12]." }
+ { "%j" "Day of the year as a decimal number [001,366]." }
+ { "%m" "Month as a decimal number [01,12]." }
+ { "%M" "Minute as a decimal number [00,59]." }
+ { "%p" "Either AM or PM." }
+ { "%S" "Second as a decimal number [00,59]." }
+ { "%U" "Week number of the year (Sunday as the first day of the week) as a decimal numberb [00,53]." }
+ { "%w" "Weekday as a decimal number [0(Sunday),6]." }
+ { "%W" "Week number of the year (Monday as the first day of the week) as a decimal numberb [00,53]." }
+ { "%x" "Date representation." }
+ { "%X" "Time representation." }
+ { "%y" "Year without century as a decimal number [00,99]." }
+ { "%Y" "Year with century as a decimal number." }
+ { "%Z" "Time zone name (no characters if no time zone exists)." }
+ { "%%" "A literal '%' character." }
+} ;
+
+ABOUT: "strftime"
+
+
--- /dev/null
+! Copyright (C) 2008 John Benediktsson
+! See http://factorcode.org/license.txt for BSD license
+
+USING: kernel time tools.test calendar ;
+
+IN: time.tests
+
+[ "%H:%M:%S" strftime ] must-infer
+
+: testtime ( -- timestamp )
+ 2008 10 9 12 3 15 instant <timestamp> ;
+
+[ t ] [ "12:03:15" testtime "%H:%M:%S" strftime = ] unit-test
+[ t ] [ "12:03:15" testtime "%X" strftime = ] unit-test
+
+[ t ] [ "10/09/2008" testtime "%m/%d/%Y" strftime = ] unit-test
+[ t ] [ "10/09/2008" testtime "%x" strftime = ] unit-test
+
+[ t ] [ "Thu" testtime "%a" strftime = ] unit-test
+[ t ] [ "Thursday" testtime "%A" strftime = ] unit-test
+
+[ t ] [ "Oct" testtime "%b" strftime = ] unit-test
+[ t ] [ "October" testtime "%B" strftime = ] unit-test
+
--- /dev/null
+! Copyright (C) 2008 John Benediktsson
+! See http://factorcode.org/license.txt for BSD license
+
+USING: accessors arrays calendar io kernel fry macros math
+math.functions math.parser peg.ebnf sequences strings vectors ;
+
+IN: time
+
+: timestring ( timestamp -- string )
+ [ hour>> ] keep [ minute>> ] keep second>> 3array
+ [ number>string 2 CHAR: 0 pad-left ] map ":" join ; inline
+
+: datestring ( timestamp -- string )
+ [ month>> ] keep [ day>> ] keep year>> 3array
+ [ number>string 2 CHAR: 0 pad-left ] map "/" join ; inline
+
+<PRIVATE
+
+EBNF: parse-format-string
+
+fmt-% = "%" => [[ [ "%" ] ]]
+fmt-a = "a" => [[ [ dup day-of-week day-abbreviation3 ] ]]
+fmt-A = "A" => [[ [ dup day-of-week day-name ] ]]
+fmt-b = "b" => [[ [ dup month>> month-abbreviation ] ]]
+fmt-B = "B" => [[ [ dup month>> month-name ] ]]
+fmt-c = "c" => [[ [ "Not yet implemented" throw ] ]]
+fmt-d = "d" => [[ [ dup day>> number>string 2 CHAR: 0 pad-left ] ]]
+fmt-H = "H" => [[ [ dup hour>> number>string 2 CHAR: 0 pad-left ] ]]
+fmt-I = "I" => [[ [ dup hour>> 12 > [ 12 - ] when number>string 2 CHAR: 0 pad-left ] ]]
+fmt-j = "j" => [[ [ dup day-of-year number>string ] ]]
+fmt-m = "m" => [[ [ dup month>> number>string 2 CHAR: 0 pad-left ] ]]
+fmt-M = "M" => [[ [ dup minute>> number>string 2 CHAR: 0 pad-left ] ]]
+fmt-p = "p" => [[ [ dup hour>> 12 < [ "AM" ] [ "PM" ] ? ] ]]
+fmt-S = "S" => [[ [ dup second>> round number>string 2 CHAR: 0 pad-left ] ]]
+fmt-U = "U" => [[ [ "Not yet implemented" throw ] ]]
+fmt-w = "w" => [[ [ dup day-of-week number>string ] ]]
+fmt-W = "W" => [[ [ "Not yet implemented" throw ] ]]
+fmt-x = "x" => [[ [ dup datestring ] ]]
+fmt-X = "X" => [[ [ dup timestring ] ]]
+fmt-y = "y" => [[ [ dup year>> 100 mod number>string ] ]]
+fmt-Y = "Y" => [[ [ dup year>> number>string ] ]]
+fmt-Z = "Z" => [[ [ "Not yet implemented" throw ] ]]
+unknown = (.)* => [[ "Unknown directive" throw ]]
+
+formats_ = fmt-%|fmt-a|fmt-A|fmt-b|fmt-B|fmt-c|fmt-d|fmt-H|fmt-I|
+ fmt-j|fmt-m|fmt-M|fmt-p|fmt-S|fmt-U|fmt-w|fmt-W|fmt-x|
+ fmt-X|fmt-y|fmt-Y|fmt-Z|unknown
+
+formats = "%" (formats_) => [[ second '[ _ dip ] ]]
+
+plain-text = (!("%").)+ => [[ >string '[ _ swap ] ]]
+
+text = (formats|plain-text)* => [[ reverse [ [ [ push ] keep ] append ] map ]]
+
+;EBNF
+
+PRIVATE>
+
+MACRO: strftime ( format-string -- )
+ parse-format-string [ length ] keep [ ] join
+ '[ _ <vector> @ reverse concat nip ] ;
+
+
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