diff --git a/Sources/RemindCore/DateParsing.swift b/Sources/RemindCore/DateParsing.swift
index b3be087..8925f8f 100644
--- a/Sources/RemindCore/DateParsing.swift
+++ b/Sources/RemindCore/DateParsing.swift
@@ -38,6 +38,15 @@ public enum DateParsing {
     return formatter.string(from: date)
   }
 
+  public static func formatDisplayAllDay(_ date: Date, calendar: Calendar = .current) -> String {
+    let formatter = DateFormatter()
+    formatter.locale = Locale.current
+    formatter.timeZone = calendar.timeZone
+    formatter.dateStyle = .medium
+    formatter.timeStyle = .none
+    return formatter.string(from: date)
+  }
+
   private static func parseRelativeDate(_ input: String, now: Date, calendar: Calendar) -> Date? {
     switch input {
     case "today":
diff --git a/Sources/RemindCore/EventKitStore.swift b/Sources/RemindCore/EventKitStore.swift
index e44dc89..d9e5b8b 100644
--- a/Sources/RemindCore/EventKitStore.swift
+++ b/Sources/RemindCore/EventKitStore.swift
@@ -101,7 +101,7 @@ public actor RemindersStore {
     reminder.calendar = calendar
     reminder.priority = draft.priority.eventKitValue
     if let dueDate = draft.dueDate {
-      reminder.dueDateComponents = calendarComponents(from: dueDate)
+      reminder.dueDateComponents = calendarComponents(from: dueDate, isAllDay: draft.isAllDay)
     }
     try eventStore.save(reminder, commit: true)
     return ReminderItem(
@@ -113,7 +113,8 @@ public actor RemindersStore {
       priority: ReminderPriority(eventKitValue: Int(reminder.priority)),
       dueDate: date(from: reminder.dueDateComponents),
       listID: reminder.calendar.calendarIdentifier,
-      listName: reminder.calendar.title
+      listName: reminder.calendar.title,
+      isAllDay: isAllDay(components: reminder.dueDateComponents)
     )
   }
 
@@ -128,10 +129,16 @@ public actor RemindersStore {
     }
     if let dueDateUpdate = update.dueDate {
       if let dueDate = dueDateUpdate {
-        reminder.dueDateComponents = calendarComponents(from: dueDate)
+        let isAllDay = update.isAllDay ?? false
+        reminder.dueDateComponents = calendarComponents(from: dueDate, isAllDay: isAllDay)
       } else {
         reminder.dueDateComponents = nil
       }
+    } else if let isAllDay = update.isAllDay, let existingComponents = reminder.dueDateComponents {
+      // Update existing due date to change all-day status
+      if let existingDate = calendar.date(from: existingComponents) {
+        reminder.dueDateComponents = calendarComponents(from: existingDate, isAllDay: isAllDay)
+      }
     }
     if let priority = update.priority {
       reminder.priority = priority.eventKitValue
@@ -154,7 +161,8 @@ public actor RemindersStore {
       priority: ReminderPriority(eventKitValue: Int(reminder.priority)),
       dueDate: date(from: reminder.dueDateComponents),
       listID: reminder.calendar.calendarIdentifier,
-      listName: reminder.calendar.title
+      listName: reminder.calendar.title,
+      isAllDay: isAllDay(components: reminder.dueDateComponents)
     )
   }
 
@@ -174,7 +182,8 @@ public actor RemindersStore {
           priority: ReminderPriority(eventKitValue: Int(reminder.priority)),
           dueDate: date(from: reminder.dueDateComponents),
           listID: reminder.calendar.calendarIdentifier,
-          listName: reminder.calendar.title
+          listName: reminder.calendar.title,
+          isAllDay: isAllDay(components: reminder.dueDateComponents)
         )
       )
     }
@@ -214,6 +223,7 @@ public actor RemindersStore {
       let dueDateComponents: DateComponents?
       let listID: String
       let listName: String
+      let isAllDay: Bool
     }
 
     let reminderData = await withCheckedContinuation { (continuation: CheckedContinuation<[ReminderData], Never>) in
@@ -229,7 +239,8 @@ public actor RemindersStore {
             priority: Int(reminder.priority),
             dueDateComponents: reminder.dueDateComponents,
             listID: reminder.calendar.calendarIdentifier,
-            listName: reminder.calendar.title
+            listName: reminder.calendar.title,
+            isAllDay: Self.checkIsAllDay(components: reminder.dueDateComponents)
           )
         }
         continuation.resume(returning: data)
@@ -246,7 +257,8 @@ public actor RemindersStore {
         priority: ReminderPriority(eventKitValue: data.priority),
         dueDate: date(from: data.dueDateComponents),
         listID: data.listID,
-        listName: data.listName
+        listName: data.listName,
+        isAllDay: data.isAllDay
       )
     }
   }
@@ -266,8 +278,12 @@ public actor RemindersStore {
     return calendar
   }
 
-  private func calendarComponents(from date: Date) -> DateComponents {
-    calendar.dateComponents([.year, .month, .day, .hour, .minute], from: date)
+  private func calendarComponents(from date: Date, isAllDay: Bool = false) -> DateComponents {
+    if isAllDay {
+      return calendar.dateComponents([.year, .month, .day], from: date)
+    } else {
+      return calendar.dateComponents([.year, .month, .day, .hour, .minute], from: date)
+    }
   }
 
   private func date(from components: DateComponents?) -> Date? {
@@ -275,6 +291,17 @@ public actor RemindersStore {
     return calendar.date(from: components)
   }
 
+  private func isAllDay(components: DateComponents?) -> Bool {
+    guard let components else { return false }
+    // A reminder is all-day if it has date components but no time components
+    return components.hour == nil && components.minute == nil && components.second == nil
+  }
+
+  private static func checkIsAllDay(components: DateComponents?) -> Bool {
+    guard let components else { return false }
+    return components.hour == nil && components.minute == nil && components.second == nil
+  }
+
   private func item(from reminder: EKReminder) -> ReminderItem {
     ReminderItem(
       id: reminder.calendarItemIdentifier,
@@ -285,7 +312,8 @@ public actor RemindersStore {
       priority: ReminderPriority(eventKitValue: Int(reminder.priority)),
       dueDate: date(from: reminder.dueDateComponents),
       listID: reminder.calendar.calendarIdentifier,
-      listName: reminder.calendar.title
+      listName: reminder.calendar.title,
+      isAllDay: isAllDay(components: reminder.dueDateComponents)
     )
   }
 }
diff --git a/Sources/RemindCore/Models.swift b/Sources/RemindCore/Models.swift
index 5f4fe90..a0146d5 100644
--- a/Sources/RemindCore/Models.swift
+++ b/Sources/RemindCore/Models.swift
@@ -53,6 +53,7 @@ public struct ReminderItem: Identifiable, Codable, Sendable, Equatable {
   public let dueDate: Date?
   public let listID: String
   public let listName: String
+  public let isAllDay: Bool
 
   public init(
     id: String,
@@ -63,7 +64,8 @@ public struct ReminderItem: Identifiable, Codable, Sendable, Equatable {
     priority: ReminderPriority,
     dueDate: Date?,
     listID: String,
-    listName: String
+    listName: String,
+    isAllDay: Bool = false
   ) {
     self.id = id
     self.title = title
@@ -74,6 +76,7 @@ public struct ReminderItem: Identifiable, Codable, Sendable, Equatable {
     self.dueDate = dueDate
     self.listID = listID
     self.listName = listName
+    self.isAllDay = isAllDay
   }
 }
 
@@ -82,12 +85,14 @@ public struct ReminderDraft: Sendable {
   public let notes: String?
   public let dueDate: Date?
   public let priority: ReminderPriority
+  public let isAllDay: Bool
 
-  public init(title: String, notes: String?, dueDate: Date?, priority: ReminderPriority) {
+  public init(title: String, notes: String?, dueDate: Date?, priority: ReminderPriority, isAllDay: Bool = false) {
     self.title = title
     self.notes = notes
     self.dueDate = dueDate
     self.priority = priority
+    self.isAllDay = isAllDay
   }
 }
 
@@ -98,6 +103,7 @@ public struct ReminderUpdate: Sendable {
   public let priority: ReminderPriority?
   public let listName: String?
   public let isCompleted: Bool?
+  public let isAllDay: Bool?
 
   public init(
     title: String? = nil,
@@ -105,7 +111,8 @@ public struct ReminderUpdate: Sendable {
     dueDate: Date?? = nil,
     priority: ReminderPriority? = nil,
     listName: String? = nil,
-    isCompleted: Bool? = nil
+    isCompleted: Bool? = nil,
+    isAllDay: Bool? = nil
   ) {
     self.title = title
     self.notes = notes
@@ -113,5 +120,6 @@ public struct ReminderUpdate: Sendable {
     self.priority = priority
     self.listName = listName
     self.isCompleted = isCompleted
+    self.isAllDay = isAllDay
   }
 }
diff --git a/Sources/remindctl/Commands/AddCommand.swift b/Sources/remindctl/Commands/AddCommand.swift
index 571bc25..63b4f2e 100644
--- a/Sources/remindctl/Commands/AddCommand.swift
+++ b/Sources/remindctl/Commands/AddCommand.swift
@@ -24,6 +24,9 @@ enum AddCommand {
               help: "none|low|medium|high",
               parsing: .singleValue
             ),
+          ],
+          flags: [
+            .make(label: "allDay", names: [.long("all-day")], help: "Create all-day reminder (no specific time)"),
           ]
         )
       ),
@@ -31,6 +34,7 @@ enum AddCommand {
         "remindctl add \"Buy milk\"",
         "remindctl add --title \"Call mom\" --list Personal --due tomorrow",
         "remindctl add \"Review docs\" --priority high",
+        "remindctl add \"Meeting prep\" --due today --all-day",
       ]
     ) { values, runtime in
       let titleOption = values.option("title")
@@ -59,6 +63,7 @@ enum AddCommand {
 
       let dueDate = try dueValue.map(CommandHelpers.parseDueDate)
       let priority = try priorityValue.map(CommandHelpers.parsePriority) ?? .none
+      let isAllDay = values.flag("allDay")
 
       let store = RemindersStore()
       try await store.requestAccess()
@@ -73,7 +78,7 @@ enum AddCommand {
         throw RemindCoreError.operationFailed("No default list found. Specify --list.")
       }
 
-      let draft = ReminderDraft(title: title, notes: notes, dueDate: dueDate, priority: priority)
+      let draft = ReminderDraft(title: title, notes: notes, dueDate: dueDate, priority: priority, isAllDay: isAllDay)
       let reminder = try await store.createReminder(draft, listName: targetList)
       OutputRenderer.printReminder(reminder, format: runtime.outputFormat)
     }
diff --git a/Sources/remindctl/OutputFormatting.swift b/Sources/remindctl/OutputFormatting.swift
index ee85c61..580887f 100644
--- a/Sources/remindctl/OutputFormatting.swift
+++ b/Sources/remindctl/OutputFormatting.swift
@@ -50,7 +50,7 @@ enum OutputRenderer {
   static func printReminder(_ reminder: ReminderItem, format: OutputFormat) {
     switch format {
     case .standard:
-      let due = reminder.dueDate.map { DateParsing.formatDisplay($0) } ?? "no due date"
+      let due = formatDueDate(reminder.dueDate, isAllDay: reminder.isAllDay)
       Swift.print("✓ \(reminder.title) [\(reminder.listName)] — \(due)")
     case .plain:
       Swift.print(plainLine(for: reminder))
@@ -96,12 +96,17 @@ enum OutputRenderer {
     }
     for (index, reminder) in sorted.enumerated() {
       let status = reminder.isCompleted ? "x" : " "
-      let due = reminder.dueDate.map { DateParsing.formatDisplay($0) } ?? "no due date"
+      let due = formatDueDate(reminder.dueDate, isAllDay: reminder.isAllDay)
       let priority = reminder.priority == .none ? "" : " priority=\(reminder.priority.rawValue)"
       Swift.print("[\(index + 1)] [\(status)] \(reminder.title) [\(reminder.listName)] — \(due)\(priority)")
     }
   }
 
+  private static func formatDueDate(_ dueDate: Date?, isAllDay: Bool) -> String {
+    guard let dueDate else { return "no due date" }
+    return isAllDay ? DateParsing.formatDisplayAllDay(dueDate) : DateParsing.formatDisplay(dueDate)
+  }
+
   private static func printRemindersPlain(_ reminders: [ReminderItem]) {
     let sorted = ReminderFiltering.sort(reminders)
     for reminder in sorted {