diff --git a/gui_app.py b/gui_app.py
index fd2a253..b6a63de 100644
--- a/gui_app.py
+++ b/gui_app.py
@@ -109,8 +109,11 @@ def reschedule_active_jobs():
                     )
                 elif schedule_type == 'monthly':
                     hour, minute = (schedule_time.split(':') + ['00'])[:2]
+                    day_val = monthly_day
+                    if str(day_val).isdigit():
+                        day_val = max(1, min(28, int(day_val)))
                     trigger = CronTrigger(
-                        day=max(1, min(28, int(monthly_day or 1))),
+                        day=day_val,
                         hour=int(hour), minute=int(minute)
                     )
                 elif schedule_type == 'interval':
@@ -307,6 +310,8 @@ def job_to_display(jid, info):
         'disks_count':   len(disk_filter) if disk_filter is not None else None,
         'retention_type':  info.get('retention_type', 'keep_all'),
         'retention_value': info.get('retention_value', 5),
+        'monthly_day':     info.get('monthly_day'),
+        'weekly_day':      info.get('weekly_day'),
     }
 
 
@@ -490,8 +495,11 @@ def create_and_start_job(
             )
         elif schedule_type == 'monthly':
             hour, minute = (schedule_time.split(':') + ['00'])[:2]
+            day_val = monthly_day
+            if str(day_val).isdigit():
+                day_val = max(1, min(28, int(day_val)))
             trigger = CronTrigger(
-                day=max(1, min(28, int(monthly_day or 1))),
+                day=day_val,
                 hour=int(hour), minute=int(minute)
             )
         elif schedule_type == 'interval':
@@ -629,8 +637,17 @@ def create_job():
         daily_time    = request.form.get('daily_time', '02:00')
         weekly_day    = request.form.get('weekly_day', '0')
         weekly_time   = request.form.get('weekly_time', '02:00')
-        monthly_day   = request.form.get('monthly_day', '1')
-        monthly_time  = request.form.get('monthly_time', '02:00')
+        
+        monthly_basis = request.form.get('monthly_basis', 'day_num')
+        if monthly_basis == 'weekday':
+            monthly_week_num = request.form.get('monthly_week_num', '1st')
+            monthly_day_of_week = request.form.get('monthly_day_of_week', 'sun')
+            monthly_day = f"{monthly_week_num} {monthly_day_of_week}"
+            monthly_time = request.form.get('monthly_time_2', '02:00')
+        else:
+            monthly_day = request.form.get('monthly_day', '1')
+            monthly_time = request.form.get('monthly_time_1', '02:00')
+            
         interval_hrs  = request.form.get('interval_hours', '24')
         label         = request.form.get('job_label', '').strip()
 
@@ -726,8 +743,17 @@ def batch_jobs():
         daily_time    = request.form.get('daily_time', '02:00')
         weekly_day    = request.form.get('weekly_day', '0')
         weekly_time   = request.form.get('weekly_time', '02:00')
-        monthly_day   = request.form.get('monthly_day', '1')
-        monthly_time  = request.form.get('monthly_time', '02:00')
+        
+        monthly_basis = request.form.get('monthly_basis', 'day_num')
+        if monthly_basis == 'weekday':
+            monthly_week_num = request.form.get('monthly_week_num', '1st')
+            monthly_day_of_week = request.form.get('monthly_day_of_week', 'sun')
+            monthly_day = f"{monthly_week_num} {monthly_day_of_week}"
+            monthly_time = request.form.get('monthly_time_2', '02:00')
+        else:
+            monthly_day = request.form.get('monthly_day', '1')
+            monthly_time = request.form.get('monthly_time_1', '02:00')
+            
         interval_hrs  = request.form.get('interval_hours', '24')
         label_prefix  = request.form.get('job_label', '').strip()
 
diff --git a/templates/batch_job.html b/templates/batch_job.html
index 1689de3..b98e2a9 100644
--- a/templates/batch_job.html
+++ b/templates/batch_job.html
@@ -369,15 +369,54 @@
             </div>
           </div>
           <div class="schedule-detail" id="detail-monthly">
-            <div class="form-row">
+            <div class="form-row" style="margin-bottom: 12px;">
+              <div class="form-group" style="margin:0; grid-column: span 2;">
+                <label class="form-label" for="monthly_basis">Monthly Schedule Type</label>
+                <select id="monthly_basis" name="monthly_basis" class="form-control" onchange="onMonthlyBasisChange(this.value)">
+                  <option value="day_num">Specific Day of Month (e.g. 1st, 15th)</option>
+                  <option value="weekday">Specific Weekday of Month (e.g. 1st Sunday, Last Saturday)</option>
+                </select>
+              </div>
+            </div>
+            
+            <div class="form-row" id="monthly_day_num_row">
               <div class="form-group" style="margin:0;">
                 <label class="form-label" for="monthly_day">Day of month (1–28)</label>
                 <input id="monthly_day" class="form-control" type="number"
                        name="monthly_day" min="1" max="28" value="1" />
               </div>
               <div class="form-group" style="margin:0;">
-                <label class="form-label" for="monthly_time">Time (24h)</label>
-                <input id="monthly_time" class="form-control" type="time" name="monthly_time" value="02:00" />
+                <label class="form-label" for="monthly_time_1">Time (24h)</label>
+                <input id="monthly_time_1" class="form-control" type="time" name="monthly_time_1" value="02:00" />
+              </div>
+            </div>
+
+            <div class="form-row" id="monthly_weekday_row" style="display:none;">
+              <div class="form-group" style="margin:0;">
+                <label class="form-label" for="monthly_week_num">Which Week</label>
+                <select id="monthly_week_num" name="monthly_week_num" class="form-control">
+                  <option value="1st">1st (First)</option>
+                  <option value="2nd">2nd (Second)</option>
+                  <option value="3rd">3rd (Third)</option>
+                  <option value="4th">4th (Fourth)</option>
+                  <option value="last">Last</option>
+                </select>
+              </div>
+              <div class="form-group" style="margin:0;">
+                <label class="form-label" for="monthly_day_of_week">Day of Week</label>
+                <select id="monthly_day_of_week" name="monthly_day_of_week" class="form-control">
+                  <option value="sun" selected>Sunday (Weekend)</option>
+                  <option value="sat">Saturday (Weekend)</option>
+                  <option value="mon">Monday</option>
+                  <option value="tue">Tuesday</option>
+                  <option value="wed">Wednesday</option>
+                  <option value="thu">Thursday</option>
+                  <option value="fri">Friday</option>
+                </select>
+              </div>
+              <div class="form-group" style="margin:0; grid-column: span 2; margin-top: 12px;">
+                <label class="form-label" for="monthly_time_2">Time (24h)</label>
+                <input id="monthly_time_2" class="form-control" type="time" name="monthly_time_2" value="02:00" />
               </div>
             </div>
           </div>
@@ -497,6 +536,18 @@
       hint.textContent = 'Backups older than N days will be deleted automatically.';
     }
   }
+
+  function onMonthlyBasisChange(val) {
+    const dayNumRow = document.getElementById('monthly_day_num_row');
+    const weekdayRow = document.getElementById('monthly_weekday_row');
+    if (val === 'day_num') {
+      dayNumRow.style.display = '';
+      weekdayRow.style.display = 'none';
+    } else {
+      dayNumRow.style.display = 'none';
+      weekdayRow.style.display = '';
+    }
+  }
 </script>
 {% endblock %}
 
diff --git a/templates/create_job.html b/templates/create_job.html
index 16671a7..7b355e7 100644
--- a/templates/create_job.html
+++ b/templates/create_job.html
@@ -373,15 +373,54 @@
 
           <!-- Monthly detail -->
           <div class="schedule-detail" id="detail-monthly">
-            <div class="form-row">
+            <div class="form-row" style="margin-bottom: 12px;">
+              <div class="form-group" style="margin:0; grid-column: span 2;">
+                <label class="form-label" for="monthly_basis">Monthly Schedule Type</label>
+                <select id="monthly_basis" name="monthly_basis" class="form-control" onchange="onMonthlyBasisChange(this.value)">
+                  <option value="day_num">Specific Day of Month (e.g. 1st, 15th)</option>
+                  <option value="weekday">Specific Weekday of Month (e.g. 1st Sunday, Last Saturday)</option>
+                </select>
+              </div>
+            </div>
+            
+            <div class="form-row" id="monthly_day_num_row">
               <div class="form-group" style="margin:0;">
                 <label class="form-label" for="monthly_day">Day of month (1–28)</label>
                 <input id="monthly_day" class="form-control" type="number"
                        name="monthly_day" min="1" max="28" value="1" />
               </div>
               <div class="form-group" style="margin:0;">
-                <label class="form-label" for="monthly_time">Time (24h)</label>
-                <input id="monthly_time" class="form-control" type="time" name="monthly_time" value="02:00" />
+                <label class="form-label" for="monthly_time_1">Time (24h)</label>
+                <input id="monthly_time_1" class="form-control" type="time" name="monthly_time_1" value="02:00" />
+              </div>
+            </div>
+
+            <div class="form-row" id="monthly_weekday_row" style="display:none;">
+              <div class="form-group" style="margin:0;">
+                <label class="form-label" for="monthly_week_num">Which Week</label>
+                <select id="monthly_week_num" name="monthly_week_num" class="form-control">
+                  <option value="1st">1st (First)</option>
+                  <option value="2nd">2nd (Second)</option>
+                  <option value="3rd">3rd (Third)</option>
+                  <option value="4th">4th (Fourth)</option>
+                  <option value="last">Last</option>
+                </select>
+              </div>
+              <div class="form-group" style="margin:0;">
+                <label class="form-label" for="monthly_day_of_week">Day of Week</label>
+                <select id="monthly_day_of_week" name="monthly_day_of_week" class="form-control">
+                  <option value="sun" selected>Sunday (Weekend)</option>
+                  <option value="sat">Saturday (Weekend)</option>
+                  <option value="mon">Monday</option>
+                  <option value="tue">Tuesday</option>
+                  <option value="wed">Wednesday</option>
+                  <option value="thu">Thursday</option>
+                  <option value="fri">Friday</option>
+                </select>
+              </div>
+              <div class="form-group" style="margin:0; grid-column: span 2; margin-top: 12px;">
+                <label class="form-label" for="monthly_time_2">Time (24h)</label>
+                <input id="monthly_time_2" class="form-control" type="time" name="monthly_time_2" value="02:00" />
               </div>
             </div>
           </div>
@@ -578,5 +617,17 @@
       hint.textContent = 'Backups older than N days will be deleted automatically.';
     }
   }
+
+  function onMonthlyBasisChange(val) {
+    const dayNumRow = document.getElementById('monthly_day_num_row');
+    const weekdayRow = document.getElementById('monthly_weekday_row');
+    if (val === 'day_num') {
+      dayNumRow.style.display = '';
+      weekdayRow.style.display = 'none';
+    } else {
+      dayNumRow.style.display = 'none';
+      weekdayRow.style.display = '';
+    }
+  }
 </script>
 {% endblock %}
diff --git a/templates/job_detail.html b/templates/job_detail.html
index fb2b318..8b85038 100644
--- a/templates/job_detail.html
+++ b/templates/job_detail.html
@@ -167,6 +167,11 @@
         {% if job.schedule_type and job.schedule_type != 'now' %}
           <svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round" style="vertical-align: middle; margin-right: 6px;"><path d="M23 4v6h-6"/><path d="M20.49 15a9 9 0 1 1-2.12-9.36L23 10"/></svg>
           {{ job.schedule_type|capitalize }}
+          {% if job.schedule_type == 'monthly' and job.monthly_day is not none %}
+            (Day: {{ job.monthly_day }})
+          {% elif job.schedule_type == 'weekly' and job.weekly_day is not none %}
+            (Day: {{ ['Monday','Tuesday','Wednesday','Thursday','Friday','Saturday','Sunday'][job.weekly_day|int] if (job.weekly_day|string).isdigit() else job.weekly_day }})
+          {% endif %}
           {% if job.schedule_time %}at {{ job.schedule_time }}{% endif %}
         {% else %}
           One-time (Run Now)