1 ## Copyright (C) 2006-2012 Paul Kienzle
3 ## This file is part of Octave.
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20 ## @deftypefn {Function File} {@var{days} =} datenum (@var{datevec})
21 ## @deftypefnx {Function File} {@var{days} =} datenum (@var{year}, @var{month}, @var{day})
22 ## @deftypefnx {Function File} {@var{days} =} datenum (@var{year}, @var{month}, @var{day}, @var{hour})
23 ## @deftypefnx {Function File} {@var{days} =} datenum (@var{year}, @var{month}, @var{day}, @var{hour}, @var{minute})
24 ## @deftypefnx {Function File} {@var{days} =} datenum (@var{year}, @var{month}, @var{day}, @var{hour}, @var{minute}, @var{second})
25 ## @deftypefnx {Function File} {@var{days} =} datenum ("datestr")
26 ## @deftypefnx {Function File} {@var{days} =} datenum ("datestr", @var{p})
27 ## @deftypefnx {Function File} {[@var{days}, @var{secs}] =} datenum (@dots{})
28 ## Return the date/time input as a serial day number, with Jan 1, 0000
31 ## The integer part, @code{floor (@var{days})} counts the number of
32 ## complete days in the date input.
34 ## The fractional part, @code{rem (@var{days}, 1)} corresponds to the time
37 ## The input may be a date vector (see @code{datevec}),
38 ## datestr (see @code{datestr}), or directly specified as input.
40 ## When processing input datestrings, @var{p} is the year at the start of the
41 ## century to which two-digit years will be referenced. If not specified, it
42 ## defaults to the current year minus 50.
44 ## The optional output @var{secs} holds the time on the specified day with
45 ## greater precision than @var{days}.
51 ## Years can be negative and/or fractional.
54 ## Months below 1 are considered to be January.
57 ## Days of the month start at 1.
60 ## Days beyond the end of the month go into subsequent months.
63 ## Days before the beginning of the month go to the previous month.
66 ## Days can be fractional.
69 ## @strong{Caution:} this function does not attempt to handle Julian
70 ## calendars so dates before Octave 15, 1582 are wrong by as much
71 ## as eleven days. Also, be aware that only Roman Catholic countries
72 ## adopted the calendar in 1582. It took until 1924 for it to be
73 ## adopted everywhere. See the Wikipedia entry on the Gregorian
74 ## calendar for more details.
76 ## @strong{Warning:} leap seconds are ignored. A table of leap seconds
77 ## is available on the Wikipedia entry for leap seconds.
78 ## @seealso{datestr, datevec, now, clock, date}
81 ## Algorithm: Peter Baum (http://vsg.cape.com/~pbaum/date/date0.htm)
82 ## Author: pkienzle <pkienzle@users.sf.net>
84 function [days, secs] = datenum (year, month = [], day = [], hour = 0, minute = 0, second = 0)
86 ## Days until start of month assuming year starts March 1.
87 persistent monthstart = [306; 337; 0; 31; 61; 92; 122; 153; 184; 214; 245; 275];
89 if (nargin == 0 || nargin > 6 ||
90 (nargin > 2 && (ischar (year) || iscellstr (year))))
94 if (ischar (year) || iscellstr (year))
95 [year, month, day, hour, minute, second] = datevec (year, month);
100 error ("datenum: expected date vector containing [YEAR, MONTH, DAY, HOUR, MINUTE, SECOND]");
102 if (nc >= 6) second = year(:,6); endif
103 if (nc >= 5) minute = year(:,5); endif
104 if (nc >= 4) hour = year(:,4); endif
111 month(month<1) = 1; ## For compatibility. Otherwise allow negative months.
113 ## Set start of year to March by moving Jan. and Feb. to previous year.
114 ## Correct for months > 12 by moving to subsequent years.
115 year += fix ((month-14)/12);
117 ## Lookup number of days since start of the current year.
118 if (numel (month) == 1 || numel (day) == 1)
119 ## Allow month or day to be scalar while other values may be vectors or
121 day += monthstart (mod (month-1,12) + 1) + 60;
122 if (numel (month) > 1)
123 day = reshape (day, size (month));
126 day += reshape (monthstart (mod (month-1,12) + 1), size (day)) + 60;
129 ## Add number of days to the start of the current year. Correct
130 ## for leap year every 4 years except centuries not divisible by 400.
131 day += 365*year + floor (year/4) - floor (year/100) + floor (year/400);
133 ## Add fraction representing current second of the day.
134 days = day + (hour + (minute + second/60)/60)/24;
136 ## Output seconds if asked so that etime can be more accurate
138 secs = day*86400 + hour*3600 + minute*60 + second;
145 %! part = 0.514623842592593;
146 %!assert (datenum (2001,5,19), 730990)
147 %!assert (datenum ([1417,6,12]), 517712)
148 %!assert (datenum ([2001,5,19;1417,6,12]), [730990;517712])
149 %!assert (datenum (2001,5,19,12,21,3.5), 730990+part, eps)
150 %!assert (datenum ([1417,6,12,12,21,3.5]), 517712+part, eps)
151 ## Test vector inputs
153 %! t = [2001,5,19,12,21,3.5; 1417,6,12,12,21,3.5];
154 %! n = [730990; 517712] + part;
155 %! assert (datenum (t), n, 2*eps);
156 %! ## Check that vectors can have either orientation
159 %! assert (datenum (t(1,:), t(2,:), t(3,:), t(4,:), t(5,:), t(6,:)), n, 2*eps);
161 ## Test mixed vectors and scalars
162 %!assert (datenum([2008;2009], 1, 1), [datenum(2008, 1, 1);datenum(2009, 1, 1)]);
163 %!assert (datenum(2008, [1;2], 1), [datenum(2008, 1, 1);datenum(2008, 2, 1)]);
164 %!assert (datenum(2008, 1, [1;2]), [datenum(2008, 1, 1);datenum(2008, 1, 2)]);
165 %!assert (datenum([2008;2009], [1;2], 1), [datenum(2008, 1, 1);datenum(2009, 2, 1)]);
166 %!assert (datenum([2008;2009], 1, [1;2]), [datenum(2008, 1, 1);datenum(2009, 1, 2)]);
167 %!assert (datenum(2008, [1;2], [1;2]), [datenum(2008, 1, 1);datenum(2008, 2, 2)]);
168 ## And the other orientation
169 %!assert (datenum([2008 2009], 1, 1), [datenum(2008, 1, 1) datenum(2009, 1, 1)]);
170 %!assert (datenum(2008, [1 2], 1), [datenum(2008, 1, 1) datenum(2008, 2, 1)]);
171 %!assert (datenum(2008, 1, [1 2]), [datenum(2008, 1, 1) datenum(2008, 1, 2)]);
172 %!assert (datenum([2008 2009], [1 2], 1), [datenum(2008, 1, 1) datenum(2009, 2, 1)]);
173 %!assert (datenum([2008 2009], 1, [1 2]), [datenum(2008, 1, 1) datenum(2009, 1, 2)]);
174 %!assert (datenum(2008, [1 2], [1 2]), [datenum(2008, 1, 1) datenum(2008, 2, 2)]);
175 ## Test string and cellstr inputs
176 %!assert (datenum ("5/19/2001"), 730990)
177 %!assert (datenum ({"5/19/2001"}), 730990)
178 %!assert (datenum (char ("5/19/2001", "6/6/1944")), [730990; 710189])
179 %!assert (datenum ({"5/19/2001", "6/6/1944"}), [730990; 710189])
181 %% Test input validation
183 %!error datenum (1,2,3,4,5,6,7)
184 %!error datenum ([1, 2])
185 %!error datenum ([1,2,3,4,5,6,7])