Refactor: replace deprecated datestr/datenum with datetime API

code/+nansen/+dataio/@DataSet/DataSet.m

@@ -117,7 +117,7 @@ function onIsArchiveSet(obj)
         function str = getDatePrefix(obj)
 
             if isempty(obj.DatePrefixStr_)
-                obj.DatePrefixStr_ = datestr(now, 'yyyymmdd_HH_MM_SS');
+                obj.DatePrefixStr_ = char(datetime('now'), 'yyyyMMdd_HH_mm_ss');
             end
 
             if obj.IsArchive

code/+nansen/+internal/reset.m

@@ -33,7 +33,7 @@ function reset()
         fullfile(nansenRootPath, '_userdata', 'settings') };
 
     backupPath = fullfile(nansenRootPath, '_userdata', 'backup', ...
-        datestr(now, 'yyyy_mm_dd_HHMMSS'));
+        char(datetime('now'), 'yyyy_MM_dd_HHmmss'));
 
     for i = 1:numel(folderPath)
 

code/+nansen/+manage/+options/OptionsSet.m

@@ -27,5 +27,5 @@
         end
     end
 
-    % = datestr(t, 'yyyy.mm.dd - HH:MM:SS')
+    % = char(datetime(t, 'ConvertFrom', 'datenum'), 'yyyy.MM.dd - HH:mm:ss')
 end

code/+nansen/+manage/OptionsManager.m

@@ -1492,7 +1492,7 @@ function refreshCustomOptions(obj)
             S.Description = descr;
             S.Options = opts;
             S.DateCreatedNum = t;
-            S.DateCreated = datestr(t, 'yyyy.mm.dd - HH:MM:SS');
+            S.DateCreated = char(datetime(t, 'ConvertFrom', 'datenum'), 'yyyy.MM.dd - HH:mm:ss');
         end
 
         function S = getEmptyOptionsSet()

code/+nansen/+processing/@MotionCorrectionPreview/MotionCorrectionPreview.m

@@ -104,7 +104,7 @@ function assertPreviewOptionsValid(obj)
             namePostfix = strcat(lower(obj.Name), '_preview');
             namePostfix = strrep(namePostfix, ' ', '_');
 
-            datePrefix = datestr(now, 'yyyymmdd_HH_MM_SS');
+            datePrefix = char(datetime('now'), 'yyyyMMdd_HH_mm_ss');
             folderName = strcat(datePrefix, '_', namePostfix);
 
             if ~isempty(obj.DataIoModel)

code/algorithms/+flufinder/+longitudinal/MultiSessionRoiCollection.m

@@ -242,9 +242,9 @@
 
             sessionIDs = {obj.SessionID};
             dateStrings = cellfun(@(sid) sid(7:14), sessionIDs, 'uni', 0);
-            dateNumbers = datenum(dateStrings, 'yyyymmdd');
+            dates = datetime(dateStrings, 'InputFormat', 'yyyyMMdd');
 
-            [~, sortInd] = sort(dateNumbers);
+            [~, sortInd] = sort(dates);
             obj = obj(sortInd);
         end
 

code/apps/+fovmanager/@App/App.m

@@ -1094,7 +1094,7 @@ function saveCurrentDisplay(obj)
                 mouseName = 'fov';
             end
             fileName = sprintf('%s_%s_%s.png', ...
-                                    datestr(now, 'yyyy_mm_dd_HHMMSS'), ...
+                                    char(datetime('now'), 'yyyy_MM_dd_HHmmss'), ...
                                         mouseName, ...
                                            'brainMap' );
 

code/apps/+imviewer/@App/App.m

@@ -4150,7 +4150,7 @@ function saveImage(obj, savePath)
     end
 
     function saveImageToDesktop(obj)
-        filename = strcat('imviewer_', datestr(now, 'yyyy_mm_dd-HH.MM.SS'), '.tif');
+        filename = strcat('imviewer_', char(datetime('now'), 'yyyy_MM_dd-HH.mm.ss'), '.tif');
         savePath = fullfile(getDesktop, filename);
 
         obj.saveImage(savePath)

code/apps/+mclassifier/manualClassifier.m

@@ -637,7 +637,7 @@ function keyPress(obj, src, event)
             case 'p'
                 if contains(event.Modifier, 'command')
                    im = frame2im(getframe(obj.hTiledImageAxes.Axes));
-                   filename = strcat( datestr(now, 'yyyy_mm_dd_HHMMSS'), '_printscreen.tif');
+                   filename = strcat( char(datetime('now'), 'yyyy_MM_dd_HHmmss'), '_printscreen.tif');
                    imwrite(im, fullfile(getDesktop, filename), 'TIFF')
                 end
 

code/apps/+nansen/@TaskProcessor/TaskProcessor.m

@@ -375,7 +375,7 @@ function loadTaskLists(obj, filePath)
                     obj.TaskHistory = S.taskListHistory;
                 catch ME
                     % Back up file
-                    dateStr = datestr(now, 'yyyymmdd_HH_MM_SS');
+                    dateStr = char(datetime('now'), 'yyyyMMdd_HH_mm_ss');
                     filePathBackup = strrep(filePath, '.mat', sprintf('corrupted_%s.mat', dateStr));
                     movefile(filePath, filePathBackup);
 
@@ -452,15 +452,15 @@ function onTimerPeriodSet(obj)
         function taskItem = updateTaskWhenFinished(obj, taskItem)
         %updateTaskWhenFinished Update task item from the running task obj
 
-            date2str = @(dt) datestr(dt, 'yyyy.mm.dd HH:MM:SS');
+            date2str = @(dt) char(dt, 'yyyy.MM.dd HH:mm:ss');
             finishDateStr = date2str(obj.runningTask.FinishDateTime);
 
             elapsedDuration = obj.runningTask.FinishDateTime - obj.runningTask.StartDateTime;
 
             % Update table status
             taskItem.timeStarted = obj.runningTask.StartDateTime;
             taskItem.timeFinished = finishDateStr;
-            taskItem.elapsedTime = datestr(elapsedDuration, 'HH:MM:SS');
+            taskItem.elapsedTime = char(elapsedDuration, 'hh:mm:ss');
 
             % Add diary and error stack
             taskItem.Diary = obj.runningTask.Diary;
@@ -650,11 +650,11 @@ function addCommandWindowTaskToHistory(obj, taskItem)
             % Todo: Streamline a bit more, and combine with similar parts
             % from updateTaskWhenFinished.
 
-            date2str = @(dt) datestr(dt, 'yyyy.mm.dd HH:MM:SS');
-            taskItem.timeFinished = date2str(now);
+            date2str = @(dt) char(dt, 'yyyy.MM.dd HH:mm:ss');
+            taskItem.timeFinished = date2str(datetime('now'));
 
-            elapsedDuration = datetime(now, 'ConvertFrom', 'datenum') - taskItem.timeStarted;
-            taskItem.elapsedTime = datestr(elapsedDuration, 'HH:MM:SS');
+            elapsedDuration = datetime('now') - taskItem.timeStarted;
+            taskItem.elapsedTime = char(elapsedDuration, 'hh:mm:ss');
 
             obj.addTaskToHistory(taskItem)
         end
@@ -730,7 +730,7 @@ function removeTask(obj, taskIdx, tableType)
             newTask.status = 'Uninitialized';
             newTask.numOut = numOut;
             newTask.args = args;
-            newTask.timeCreated = datestr(now, 'yyyy.mm.dd HH:MM:SS');
+            newTask.timeCreated = char(datetime('now'), 'yyyy.MM.dd HH:mm:ss');
             newTask.timeStarted = '';
             newTask.elapsedTime = '';
             newTask.timeFinished = '';

code/datatypes/+nansen/+stack/+metadata/StackMetadata.m

@@ -174,8 +174,11 @@ function uiset(obj, src, evt)
 
         function S = toStruct(obj)
             S = toStruct@nansen.dataio.metadata.AbstractMetadata(obj);
-            datestrFormat = 'YYYY_MM_DD_HH_MM_SS_sss';
-            S.StartTime = datestr(S.StartTime, datestrFormat);
+            % datetime format spec (case-sensitive: MM=month, mm=minute,
+            % SSS=millisecond). The previous datestr format
+            % 'YYYY_MM_DD_HH_MM_SS_sss' was rejected by datestr itself.
+            dateFormat = 'yyyy_MM_dd_HH_mm_ss_SSS';
+            S.StartTime = char(S.StartTime, dateFormat);
         end
 
         function fromStruct(obj, S, propertyNames)
@@ -187,8 +190,8 @@ function fromStruct(obj, S, propertyNames)
             if ~isfield(S, 'StartTime') || isempty(S.StartTime)
                 S.StartTime = datetime.empty;
             else
-                datestrFormat = 'YYYY_MM_DD_HH_MM_SS_sss';
-                S.StartTime = datetime(S.StartTime, 'InputFormat', datestrFormat);
+                dateFormat = 'yyyy_MM_dd_HH_mm_ss_SSS';
+                S.StartTime = datetime(S.StartTime, 'InputFormat', dateFormat);
             end
 
             if isfield(S, 'Size') && isa(S.Size, 'cell')

code/datatypes/+nansen/+stack/ImageStackProcessor.m

@@ -1065,7 +1065,7 @@ function appendResults(obj, iResults)
 
         function printSubTask(obj, varargin)
             msg = sprintf(varargin{:});
-            nowstr = datestr(now, 'HH:MM:ss');
+            nowstr = char(datetime('now'), 'HH:mm:ss');
             fprintf('%s: %s: %s\n', nowstr, obj.MethodName, msg)
         end
 
@@ -1207,7 +1207,7 @@ function displayImageStackSplittingInfo(obj)
     methods (Static)
         function printTask(varargin) % Todo: move to datamethod
             msg = sprintf(varargin{:});
-            nowstr = datestr(now, 'HH:MM:ss');
+            nowstr = char(datetime('now'), 'HH:mm:ss');
             fprintf('%s: %s\n', nowstr, msg)
         end
     end