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+## Copyright (C) 2000-2012 Paul Kienzle
+##
+## This file is part of Octave.
+##
+## Octave is free software; you can redistribute it and/or modify it
+## under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 3 of the License, or (at
+## your option) any later version.
+##
+## Octave is distributed in the hope that it will be useful, but
+## WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+## General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with Octave; see the file COPYING. If not, see
+## .
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {@var{v} =} datevec (@var{date})
+## @deftypefnx {Function File} {@var{v} =} datevec (@var{date}, @var{f})
+## @deftypefnx {Function File} {@var{v} =} datevec (@var{date}, @var{p})
+## @deftypefnx {Function File} {@var{v} =} datevec (@var{date}, @var{f}, @var{p})
+## @deftypefnx {Function File} {[@var{y}, @var{m}, @var{d}, @var{h}, @var{mi}, @var{s}] =} datevec (@dots{})
+## Convert a serial date number (see @code{datenum}) or date string (see
+## @code{datestr}) into a date vector.
+##
+## A date vector is a row vector with six members, representing the year,
+## month, day, hour, minute, and seconds respectively.
+##
+## @var{f} is the format string used to interpret date strings
+## (see @code{datestr}).
+##
+## @var{p} is the year at the start of the century to which two-digit years
+## will be referenced. If not specified, it defaults to the current year
+## minus 50.
+## @seealso{datenum, datestr, clock, now, date}
+## @end deftypefn
+
+## Algorithm: Peter Baum (http://vsg.cape.com/~pbaum/date/date0.htm)
+
+## Author: pkienzle
+## Modified: bdenney
+## Created: 10 October 2001 (CVS)
+## Adapted-By: William Poetra Yoga Hadisoeseno
+
+## The function __date_str2vec__ is based on datesplit by Bill Denney.
+
+function [y, m, d, h, mi, s] = datevec (date, f = [], p = [])
+
+ persistent std_formats nfmt;
+
+ if (isempty (std_formats))
+ std_formats = cell ();
+ nfmt = 0;
+ ## These formats are specified by Matlab to be parsed
+ ## The '# XX' refers to the datestr numerical format code
+ std_formats{++nfmt} = "dd-mmm-yyyy HH:MM:SS"; # 0
+ std_formats{++nfmt} = "dd-mmm-yyyy"; # 1
+ std_formats{++nfmt} = "mm/dd/yy"; # 2
+ std_formats{++nfmt} = "mm/dd"; # 6
+ std_formats{++nfmt} = "HH:MM:SS"; # 13
+ std_formats{++nfmt} = "HH:MM:SS PM"; # 14
+ std_formats{++nfmt} = "HH:MM"; # 15
+ std_formats{++nfmt} = "HH:MM PM"; # 16
+ std_formats{++nfmt} = "mm/dd/yyyy"; # 23
+
+ ## These are other formats that Octave tries
+ std_formats{++nfmt} = "mmm-dd-yyyy HH:MM:SS";
+ std_formats{++nfmt} = "mmm-dd-yyyy";
+ std_formats{++nfmt} = "dd mmm yyyy HH:MM:SS";
+ std_formats{++nfmt} = "dd mmm yyyy";
+ std_formats{++nfmt} = "mmm dd yyyy HH:MM:SS";
+ std_formats{++nfmt} = "mmm dd yyyy";
+ std_formats{++nfmt} = "dd.mmm.yyyy HH:MM:SS";
+ std_formats{++nfmt} = "dd.mmm.yyyy";
+ std_formats{++nfmt} = "mmm.dd.yyyy HH:MM:SS";
+ std_formats{++nfmt} = "mmm.dd.yyyy";
+ std_formats{++nfmt} = "mmmyy"; # 12
+ std_formats{++nfmt} = "mm/dd/yyyy HH:MM";
+ endif
+
+ if (nargin < 1 || nargin > 3)
+ print_usage ();
+ endif
+
+ if (ischar (date))
+ date = cellstr (date);
+ endif
+
+ if (isnumeric (f))
+ p = f;
+ f = [];
+ endif
+
+ if (isempty (f))
+ f = -1;
+ endif
+
+ if (isempty (p))
+ p = (localtime (time ())).year + 1900 - 50;
+ endif
+
+ if (iscell (date))
+
+ nd = numel (date);
+
+ y = m = d = h = mi = s = zeros (nd, 1);
+
+ if (f == -1)
+ for k = 1:nd
+ found = false;
+ for l = 1:nfmt
+ [f, rY, ry, fy, fm, fd, fh, fmi, fs] = __date_vfmt2sfmt__ (std_formats{l});
+ [found y(k) m(k) d(k) h(k) mi(k) s(k)] = __date_str2vec__ (date{k}, p, f, rY, ry, fy, fm, fd, fh, fmi, fs);
+ if (found)
+ break;
+ endif
+ endfor
+ if (! found)
+ error ("datevec: none of the standard formats match the DATE string");
+ endif
+ endfor
+ else
+ ## Decipher the format string just once for speed.
+ [f, rY, ry, fy, fm, fd, fh, fmi, fs] = __date_vfmt2sfmt__ (f);
+ for k = 1:nd
+ [found y(k) m(k) d(k) h(k) mi(k) s(k)] = __date_str2vec__ (date{k}, p, f, rY, ry, fy, fm, fd, fh, fmi, fs);
+ if (! found)
+ error ("datevec: DATE not parsed correctly with given format");
+ endif
+ endfor
+ endif
+
+ else # datenum input
+
+ date = date(:);
+
+ ## Move day 0 from midnight -0001-12-31 to midnight 0000-3-1
+ z = floor (date) - 60;
+ ## Calculate number of centuries; K1 = 0.25 is to avoid rounding problems.
+ a = floor ((z - 0.25) / 36524.25);
+ ## Days within century; K2 = 0.25 is to avoid rounding problems.
+ b = z - 0.25 + a - floor (a / 4);
+ ## Calculate the year (year starts on March 1).
+ y = floor (b / 365.25);
+ ## Calculate day in year.
+ c = fix (b - floor (365.25 * y)) + 1;
+ ## Calculate month in year.
+ m = fix ((5 * c + 456) / 153);
+ d = c - fix ((153 * m - 457) / 5);
+ ## Move to Jan 1 as start of year.
+ ++y(m > 12);
+ m(m > 12) -= 12;
+
+ ## Convert hour-minute-seconds. Attempt to account for precision of
+ ## datenum format.
+
+ fracd = date - floor (date);
+ tmps = abs (eps*86400*date);
+ tmps(tmps == 0) = 1;
+ srnd = 2 .^ floor (- log2 (tmps));
+ s = round (86400 * fracd .* srnd) ./ srnd;
+ h = floor (s / 3600);
+ s = s - 3600 * h;
+ mi = floor (s / 60);
+ s = s - 60 * mi;
+
+ endif
+
+ if (nargout <= 1)
+ y = [y, m, d, h, mi, s];
+ endif
+
+endfunction
+
+function [f, rY, ry, fy, fm, fd, fh, fmi, fs] = __date_vfmt2sfmt__ (f)
+
+ ## Play safe with percent signs.
+ f = strrep (f, "%", "%%");
+
+ if (! isempty (strfind (f, "PM")) || ! isempty (strfind (f, "AM")))
+ ampm = true;
+ else
+ ampm = false;
+ endif
+
+ ## Date part.
+ f = regexprep (f, '[Yy][Yy][Yy][Yy]', "%Y");
+ f = regexprep (f, '[Yy][Yy]', "%y");
+ f = strrep (f, "mmmm", "%B");
+ f = strrep (f, "mmm", "%b");
+ f = strrep (f, "mm", "%m");
+ f = regexprep (f, '[Dd][Dd][Dd][Dd]', "%A");
+ f = regexprep (f, '[Dd][Dd][Dd]', "%a");
+ f = regexprep (f, '[Dd][Dd]', "%d");
+
+ ## Time part.
+ if (ampm)
+ f = strrep (f, "HH", "%I");
+ f = strrep (f, "PM", "%p");
+ f = strrep (f, "AM", "%p");
+ else
+ f = strrep (f, "HH", "%H");
+ endif
+ f = strrep (f, "MM", "%M");
+ f = regexprep (f, '[Ss][Ss]', "%S");
+
+ rY = rindex (f, "%Y");
+ ry = rindex (f, "%y");
+
+ ## Check whether we need to give default values.
+ ## Possible error when string contains "%%".
+ fy = rY || ry;
+ fm = index (f, "%m") || index (f, "%b") || index (f, "%B");
+ fd = index (f, "%d") || index (f, "%a") || index (f, "%A");
+ fh = index (f, "%H") || index (f, "%I");
+ fmi = index (f, "%M");
+ fs = index (f, "%S");
+
+endfunction
+
+function [found, y, m, d, h, mi, s] = __date_str2vec__ (ds, p, f, rY, ry, fy, fm, fd, fh, fmi, fs)
+
+ idx = strfind (f, "FFF");
+ if (! isempty (idx))
+ ## Kludge to handle FFF millisecond format since strptime does not
+ f(idx:idx+2) = [];
+ [~, nc] = strptime (ds, f);
+ if (nc > 0)
+ msec = ds(nc:min(nc+2, end));
+ f = [f(1:idx-1) msec f(idx:end)];
+ [tm, nc] = strptime (ds, f);
+ tm.usec = 1000 * str2double (msec);
+ endif
+ else
+ [tm, nc] = strptime (ds, f);
+ endif
+
+ if (nc == columns (ds) + 1)
+ found = true;
+ y = tm.year + 1900; m = tm.mon + 1; d = tm.mday;
+ h = tm.hour; mi = tm.min; s = tm.sec + tm.usec / 1e6;
+ if (rY < ry)
+ if (y > 1999)
+ y -= 2000;
+ else
+ y -= 1900;
+ endif
+ y += p - mod (p, 100);
+ if (y < p)
+ y += 100;
+ endif
+ endif
+ if (! fy && ! fm && ! fd)
+ tmp = localtime (time ());
+ y = tmp.year + 1900;
+ m = tmp.mon + 1;
+ d = tmp.mday;
+ elseif (! fy && fm && fd)
+ tmp = localtime (time ());
+ y = tmp.year + 1900;
+ elseif (fy && fm && ! fd)
+ d = 1;
+ endif
+ if (! fh && ! fmi && ! fs)
+ h = mi = s = 0;
+ elseif (fh && fmi && ! fs)
+ s = 0;
+ endif
+ else
+ y = m = d = h = mi = s = 0;
+ found = false;
+ endif
+
+endfunction
+
+
+%!demo
+%! ## Current date and time
+%! datevec (now ())
+
+%!shared nowvec
+%! nowvec = datevec (now); # Some tests could fail around midnight!
+%!# tests for standard formats: 0, 1, 2, 6, 13, 14, 15, 16, 23
+%!assert (datevec ("07-Sep-2000 15:38:09"), [2000,9,7,15,38,9])
+%!assert (datevec ("07-Sep-2000"), [2000,9,7,0,0,0])
+%!assert (datevec ("09/07/00"), [2000,9,7,0,0,0])
+%!assert (datevec ("09/13"), [nowvec(1),9,13,0,0,0])
+%!assert (datevec ("15:38:09"), [nowvec(1:3),15,38,9])
+%!assert (datevec ("3:38:09 PM"), [nowvec(1:3),15,38,9])
+%!assert (datevec ("15:38"), [nowvec(1:3),15,38,0])
+%!assert (datevec ("03:38 PM"), [nowvec(1:3),15,38,0])
+%!assert (datevec ("03/13/1962"), [1962,3,13,0,0,0])
+
+%% Test millisecond format FFF
+%!assert (datevec ("15:38:21.25", "HH:MM:SS.FFF"), [nowvec(1:3),15,38,21.025])
+
+# Other tests
+%!assert (datenum (datevec ([-1e4:1e4])), [-1e4:1e4]')
+%!test
+%! t = linspace (-2e5, 2e5, 10993);
+%! assert (all (abs (datenum (datevec (t)) - t') < 1e-5));
+