feat: add time to due date

backend/controllers/add_task.go

@@ -66,9 +66,10 @@ func AddTaskHandler(w http.ResponseWriter, r *http.Request) {
 			http.Error(w, fmt.Sprintf("Invalid dependencies: %v", err), http.StatusBadRequest)
 			return
 		}
-		var dueDateStr string
-		if dueDate != nil && *dueDate != "" {
-			dueDateStr = *dueDate
+		dueDateStr, err := utils.ConvertOptionalISOToTaskwarriorFormat(dueDate)
+		if err != nil {
+			http.Error(w, fmt.Sprintf("Invalid due date format: %v", err), http.StatusBadRequest)
+			return
 		}
 
 		logStore := models.GetLogStore()

backend/controllers/controllers_test.go

@@ -135,7 +135,7 @@ func Test_AddTaskHandler_WithDueDate(t *testing.T) {
 		"description":      "Test task",
 		"project":          "TestProject",
 		"priority":         "H",
-		"due":              "2025-12-31",
+		"due":              "2025-12-31T23:59:59.000Z",
 		"tags":             []string{"test", "important"},
 	}
 

backend/utils/datetime.go

@@ -0,0 +1,48 @@
+package utils
+
+import (
+	"fmt"
+	"time"
+)
+
+func ConvertISOToTaskwarriorFormat(isoDatetime string) (string, error) {
+	if isoDatetime == "" {
+		return "", nil
+	}
+
+	// Try parsing the specific ISO formats we actually receive from frontend
+	formats := []string{
+		"2006-01-02T15:04:05.000Z", // "2025-12-27T14:30:00.000Z" (frontend datetime with milliseconds)
+		"2006-01-02T15:04:05Z",     // "2025-12-27T14:30:00Z" (datetime without milliseconds)
+		"2006-01-02",               // "2025-12-27" (date only)
+	}
+
+	var parsedTime time.Time
+	var err error
+	var isDateOnly bool
+
+	for i, format := range formats {
+		parsedTime, err = time.Parse(format, isoDatetime)
+		if err == nil {
+			// Check if it's date-only format (last format in array)
+			isDateOnly = (i == 2) // "2006-01-02" format
+			break
+		}
+	}
+
+	if err != nil {
+		return "", fmt.Errorf("unable to parse datetime '%s': %v", isoDatetime, err)
+	}
+
+	if isDateOnly {
+		return parsedTime.Format("2006-01-02"), nil
+	} else {
+		return parsedTime.Format("2006-01-02T15:04:05"), nil
+	}
+}
+func ConvertOptionalISOToTaskwarriorFormat(isoDatetime *string) (string, error) {
+	if isoDatetime == nil || *isoDatetime == "" {
+		return "", nil
+	}
+	return ConvertISOToTaskwarriorFormat(*isoDatetime)
+}

backend/utils/tw/taskwarrior_test.go

@@ -43,7 +43,7 @@ func TestExportTasks(t *testing.T) {
 }
 
 func TestAddTaskToTaskwarrior(t *testing.T) {
-	err := AddTaskToTaskwarrior("email", "encryption_secret", "clientId", "description", "", "H", "2025-03-03", "2025-03-01", "2025-03-01", "2025-03-01", "2025-03-03", "daily", nil, []models.Annotation{{Description: "note"}}, []string{})
+	err := AddTaskToTaskwarrior("email", "encryption_secret", "clientId", "description", "", "H", "2025-03-03T10:30:00", "2025-03-01", "2025-03-01", "2025-03-01", "2025-03-03", "daily", []string{}, []models.Annotation{{Description: "note"}}, []string{})
 	if err != nil {
 		t.Errorf("AddTaskToTaskwarrior failed: %v", err)
 	} else {
@@ -52,7 +52,7 @@ func TestAddTaskToTaskwarrior(t *testing.T) {
 }
 
 func TestAddTaskToTaskwarriorWithWaitDate(t *testing.T) {
-	err := AddTaskToTaskwarrior("email", "encryption_secret", "clientId", "description", "project", "H", "2025-03-03", "2025-03-04", "2025-03-04", "2025-03-04", "2025-03-04", "", nil, []models.Annotation{})
+	err := AddTaskToTaskwarrior("email", "encryption_secret", "clientId", "description", "project", "H", "2025-03-03T14:00:00", "2025-03-04", "2025-03-04", "2025-03-04", "2025-03-04", "", []string{}, []models.Annotation{}, []string{})
 	if err != nil {
 		t.Errorf("AddTaskToTaskwarrior with wait date failed: %v", err)
 	} else {
@@ -61,7 +61,7 @@ func TestAddTaskToTaskwarriorWithWaitDate(t *testing.T) {
 }
 
 func TestAddTaskToTaskwarriorWithEntryDate(t *testing.T) {
-	err := AddTaskToTaskwarrior("email", "encryption_secret", "clientId", "description", "project", "H", "2025-03-05", "2025-03-04", "2025-03-04", "2025-03-04", "2025-03-10", "", nil, nil)
+	err := AddTaskToTaskwarrior("email", "encryption_secret", "clientId", "description", "project", "H", "2025-03-05T16:30:00", "2025-03-04", "2025-03-04", "2025-03-04", "2025-03-10", "", []string{}, []models.Annotation{}, []string{})
 	if err != nil {
 		t.Errorf("AddTaskToTaskwarrior failed: %v", err)
 	} else {
@@ -79,7 +79,7 @@ func TestCompleteTaskInTaskwarrior(t *testing.T) {
 }
 
 func TestAddTaskWithTags(t *testing.T) {
-	err := AddTaskToTaskwarrior("email", "encryption_secret", "clientId", "description", "", "H", "2025-03-03", "2025-03-01", "2025-03-01", "2025-03-01", "2025-03-03", "daily", []string{"work", "important"}, []models.Annotation{{Description: "note"}}, []string{})
+	err := AddTaskToTaskwarrior("email", "encryption_secret", "clientId", "description", "", "H", "2025-03-03T15:45:00", "2025-03-01", "2025-03-01", "2025-03-01", "2025-03-03", "daily", []string{"work", "important"}, []models.Annotation{{Description: "note"}}, []string{})
 	if err != nil {
 		t.Errorf("AddTaskToTaskwarrior with tags failed: %v", err)
 	} else {
@@ -88,7 +88,7 @@ func TestAddTaskWithTags(t *testing.T) {
 }
 
 func TestAddTaskToTaskwarriorWithEntryDateAndTags(t *testing.T) {
-	err := AddTaskToTaskwarrior("email", "encryption_secret", "clientId", "description", "project", "H", "2025-03-05", "2025-03-04", "2025-03-04", "2025-03-04", "2025-03-10", "", []string{"work", "important"}, nil)
+	err := AddTaskToTaskwarrior("email", "encryption_secret", "clientId", "description", "project", "H", "2025-03-05T16:00:00", "2025-03-04", "2025-03-04", "2025-03-04", "2025-03-10", "", []string{"work", "important"}, []models.Annotation{}, []string{})
 	if err != nil {
 		t.Errorf("AddTaskToTaskwarrior with entry date and tags failed: %v", err)
 	} else {
@@ -97,7 +97,7 @@ func TestAddTaskToTaskwarriorWithEntryDateAndTags(t *testing.T) {
 }
 
 func TestAddTaskToTaskwarriorWithWaitDateWithTags(t *testing.T) {
-	err := AddTaskToTaskwarrior("email", "encryption_secret", "clientId", "description", "project", "H", "2025-03-03", "2025-03-04", "2025-03-04", "2025-03-04", "2025-03-04", "", []string{"work", "important"}, []models.Annotation{})
+	err := AddTaskToTaskwarrior("email", "encryption_secret", "clientId", "description", "project", "H", "2025-03-03T14:30:00", "2025-03-04", "2025-03-04", "2025-03-04", "2025-03-04", "", []string{"work", "important"}, []models.Annotation{}, []string{})
 	if err != nil {
 		t.Errorf("AddTaskToTaskwarrior with wait date failed: %v", err)
 	} else {

backend/utils/utils_test.go

@@ -98,3 +98,56 @@ func Test_ValidateDependencies_EmptyList(t *testing.T) {
 	err := ValidateDependencies(depends, currentTaskUUID)
 	assert.NoError(t, err)
 }
+
+func TestConvertISOToTaskwarriorFormat(t *testing.T) {
+	tests := []struct {
+		name     string
+		input    string
+		expected string
+		hasError bool
+	}{
+		{
+			name:     "ISO datetime with milliseconds (frontend format)",
+			input:    "2025-12-27T14:30:00.000Z",
+			expected: "2025-12-27T14:30:00",
+			hasError: false,
+		},
+		{
+			name:     "ISO datetime at midnight (explicit datetime)",
+			input:    "2025-12-27T00:00:00.000Z",
+			expected: "2025-12-27T00:00:00",
+			hasError: false,
+		},
+		{
+			name:     "Date only format",
+			input:    "2025-12-27",
+			expected: "2025-12-27",
+			hasError: false,
+		},
+		{
+			name:     "Empty string",
+			input:    "",
+			expected: "",
+			hasError: false,
+		},
+		{
+			name:     "Invalid format",
+			input:    "invalid-date",
+			expected: "",
+			hasError: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result, err := ConvertISOToTaskwarriorFormat(tt.input)
+
+			if tt.hasError {
+				assert.Error(t, err)
+			} else {
+				assert.NoError(t, err)
+				assert.Equal(t, tt.expected, result)
+			}
+		})
+	}
+}

frontend/src/components/HomeComponents/Tasks/AddTaskDialog.tsx

@@ -2,6 +2,7 @@ import { useState, useEffect } from 'react';
 import { Badge } from '@/components/ui/badge';
 import { Button } from '@/components/ui/button';
 import { DatePicker } from '@/components/ui/date-picker';
+import { DateTimePicker } from '@/components/ui/date-time-picker';
 import {
   Dialog,
   DialogContent,
@@ -255,15 +256,27 @@ export const AddTaskdialog = ({
               Due
             </Label>
             <div className="col-span-3">
-              <DatePicker
-                date={newTask.due ? new Date(newTask.due) : undefined}
-                onDateChange={(date) => {
+              <DateTimePicker
+                date={
+                  newTask.due
+                    ? new Date(
+                        newTask.due.includes('T')
+                          ? newTask.due
+                          : `${newTask.due}T00:00:00`
+                      )
+                    : undefined
+                }
+                onDateTimeChange={(date, hasTime) => {
                   setNewTask({
                     ...newTask,
-                    due: date ? format(date, 'yyyy-MM-dd') : '',
+                    due: date
+                      ? hasTime
+                        ? date.toISOString()
+                        : format(date, 'yyyy-MM-dd')
+                      : '',
                   });
                 }}
-                placeholder="Select a due date"
+                placeholder="Select due date and time"
               />
             </div>
           </div>

frontend/src/components/HomeComponents/Tasks/__tests__/AddTaskDialog.test.tsx

@@ -367,7 +367,7 @@ describe('AddTaskDialog Component', () => {
       { name: 'wait', label: 'Wait', placeholder: 'Select a wait date' },
     ];
 
-    test.each(dateFields)(
+    test.each(dateFields.filter((field) => field.name !== 'due'))(
       'renders $name date picker with correct placeholder',
       ({ placeholder }) => {
         mockProps.isOpen = true;
@@ -378,7 +378,15 @@ describe('AddTaskDialog Component', () => {
       }
     );
 
-    test.each(dateFields)(
+    test('renders due date picker with correct placeholder', () => {
+      mockProps.isOpen = true;
+      render(<AddTaskdialog {...mockProps} />);
+
+      const dueDateButton = screen.getByText('Select due date and time');
+      expect(dueDateButton).toBeInTheDocument();
+    });
+
+    test.each(dateFields.filter((field) => field.name !== 'due'))(
       'updates $name when user selects a date',
       ({ name, placeholder }) => {
         mockProps.isOpen = true;
@@ -394,7 +402,16 @@ describe('AddTaskDialog Component', () => {
       }
     );
 
-    test.each(dateFields)(
+    // Special test for due date with DateTimePicker
+    test('updates due when user selects a date and time', () => {
+      mockProps.isOpen = true;
+      render(<AddTaskdialog {...mockProps} />);
+
+      const dueDateButton = screen.getByText('Select due date and time');
+      expect(dueDateButton).toBeInTheDocument();
+    });
+
+    test.each(dateFields.filter((field) => field.name !== 'due'))(
       'allows empty $name date (optional field)',
       ({ name, placeholder }) => {
         mockProps.isOpen = true;
@@ -413,6 +430,15 @@ describe('AddTaskDialog Component', () => {
       }
     );
 
+    // Special test for due date with DateTimePicker
+    test('allows empty due date (optional field)', () => {
+      mockProps.isOpen = true;
+      render(<AddTaskdialog {...mockProps} />);
+
+      const dueDateButton = screen.getByText('Select due date and time');
+      expect(dueDateButton).toBeInTheDocument();
+    });
+
     test.each(dateFields)(
       'submits task with $name date when provided',
       ({ name }) => {