diff --git a/matlab/@dynDates/append.m b/matlab/@dynDates/append.m
index d48a3da20..fdf3bc6b0 100644
--- a/matlab/@dynDates/append.m
+++ b/matlab/@dynDates/append.m
@@ -38,7 +38,7 @@ if isa(a,'dynDates')
         B = A;
         return
     end
-elseif ischar(a) && isdate(a) 
+elseif isdate(a)
     a = dynDates(a);
 end
 
diff --git a/matlab/@dynDates/dynDates.m b/matlab/@dynDates/dynDates.m
index 7c2bcc18a..354a98b07 100644
--- a/matlab/@dynDates/dynDates.m
+++ b/matlab/@dynDates/dynDates.m
@@ -73,7 +73,7 @@ switch nargin
     if isa(varargin{1},'dynDates')
         % Returns a copy of the input argument
         dd = varargin{1};
-    elseif ischar(varargin{1}) && isdate(varargin{1})
+    elseif isdate(varargin{1})
         date = string2date(varargin{1});
         dd.ndat = 1;
         dd.freq = date.freq;
@@ -91,7 +91,7 @@ switch nargin
   otherwise
     dd.ndat = nargin;
     dd.time = NaN(dd.ndat,2);
-    if ischar(varargin{1}) && isdate(varargin{1})
+    if isdate(varargin{1})
         date = string2date(varargin{1});
         dd.freq = date.freq;
         dd.time(1,:) = date.time;
@@ -99,7 +99,7 @@ switch nargin
         error(['dynDates::dynDates: Input 1 has to be a string date!'])
     end
     for i=2:dd.ndat
-        if ischar(varargin{i}) && isdate(varargin{i})
+        if isdate(varargin{i})
             date = string2date(varargin{i});
             if isequal(date.freq,dd.freq)
                 dd.time(i,:) = date.time;
diff --git a/matlab/@dynDates/pop.m b/matlab/@dynDates/pop.m
index d3d9acc5e..c75d756da 100644
--- a/matlab/@dynDates/pop.m
+++ b/matlab/@dynDates/pop.m
@@ -40,7 +40,7 @@ if nargin<2
     return
 end
 
-if ~(isa(a,'dynDates') || (ischar(a) && isdate(a)) || (isscalar(a) && isint(a)))
+if ~(isa(a,'dynDates') || isdate(a) || (isscalar(a) && isint(a)))
     error(['dynDates::pop: Input argument ' inputname(2) ' has to be a dynDates object with a single element, a string (which can be interpreted as a date) or an integer.'])
 end