diff --git a/matlab/utilities/dates/add_periods_to_array_of_dates.m b/matlab/utilities/dates/add_periods_to_array_of_dates.m
new file mode 100644
index 000000000..eaa5e838a
--- /dev/null
+++ b/matlab/utilities/dates/add_periods_to_array_of_dates.m
@@ -0,0 +1,79 @@
+function time = add_periods_to_array_of_dates(time, freq, p)
+
+% Adds a p periods (p can be negative) to a date (or a set of dates) characterized by array time and frequency freq.
+    
+% Copyright (C) 2013 Dynare Team
+%
+% This file is part of Dynare.
+%
+% Dynare 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.
+%
+% Dynare 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 Dynare.  If not, see <http://www.gnu.org/licenses/>.
+
+if isequal(rows(time),1) && length(p)>1
+    time = repmat(time,length(p),1);
+end
+
+time(:,1) = time(:,1) + fix(p/freq);
+time(:,2) = time(:,2) + rem(p,freq);
+
+id1 = find(time(:,2)>freq);
+time(id1,1) = time(id1,1) + 1;
+time(id1,2) = time(id1,2) - freq;
+
+id2 = find(time(:,2)<1);
+time(id2,1) = time(id2,1) - 1;
+time(id2,2) = time(id2,2) + freq;
+
+%@test:1
+%$ t(1) = dyn_assert(add_periods_to_array_of_dates([1950 1], 4, 1),[1950 2]);
+%$ t(2) = dyn_assert(add_periods_to_array_of_dates([1950 1], 4, 2),[1950 3]);
+%$ t(3) = dyn_assert(add_periods_to_array_of_dates([1950 1], 4, 3),[1950 4]);
+%$ t(4) = dyn_assert(add_periods_to_array_of_dates([1950 1], 4, 4),[1951 1]);
+%$ t(5) = dyn_assert(add_periods_to_array_of_dates([1950 1], 4, 5),[1951 2]);
+%$ t(6) = dyn_assert(add_periods_to_array_of_dates([1950 1], 4, 6),[1951 3]);
+%$ t(7) = dyn_assert(add_periods_to_array_of_dates([1950 1], 4, 7),[1951 4]);
+%$ t(8) = dyn_assert(add_periods_to_array_of_dates([1950 1], 4, 8),[1952 1]);
+%$ T = all(t);
+%@eof:1
+
+%@test:2
+%$ t(1) = dyn_assert(add_periods_to_array_of_dates(repmat([1950 1],8,1), 4, transpose(1:8)),[1950 2; 1950 3; 1950 4; 1951 1; 1951 2; 1951 3; 1951 4; 1952 1]);
+%$ T = all(t);
+%@eof:2
+
+%@test:3
+%$ t(1) = dyn_assert(add_periods_to_array_of_dates([1950 1], 1, 1),[1951 1]);
+%$ T = all(t);
+%@eof:3
+
+%@test:4
+%$ t(1) = dyn_assert(add_periods_to_array_of_dates([1950 1; 1950 2; 1950 3; 1950 4], 4, 1),[1950 2; 1950 3; 1950 4; 1951 1]);
+%$ T = all(t);
+%@eof:4
+
+%@test:5
+%$ t(1) = dyn_assert(add_periods_to_array_of_dates([1950 1], 4, transpose(1:8)),[1950 2; 1950 3; 1950 4; 1951 1; 1951 2; 1951 3; 1951 4; 1952 1]);
+%$ T = all(t);
+%@eof:5
+
+%@test:6
+%$ t(1) = dyn_assert(add_periods_to_array_of_dates([1950 1], 4, -1),[1949 4]);
+%$ t(2) = dyn_assert(add_periods_to_array_of_dates([1950 1], 4, -2),[1949 3]);
+%$ t(3) = dyn_assert(add_periods_to_array_of_dates([1950 1], 4, -3),[1949 2]);
+%$ t(4) = dyn_assert(add_periods_to_array_of_dates([1950 1], 4, -4),[1949 1]);
+%$ t(5) = dyn_assert(add_periods_to_array_of_dates([1950 1], 4, -5),[1948 4]);
+%$ t(6) = dyn_assert(add_periods_to_array_of_dates([1950 1], 4, -6),[1948 3]);
+%$ t(7) = dyn_assert(add_periods_to_array_of_dates([1950 1], 4, -7),[1948 2]);
+%$ t(8) = dyn_assert(add_periods_to_array_of_dates([1950 1], 4, -8),[1948 1]);
+%$ T = all(t);
+%@eof:6
\ No newline at end of file