diff --git a/src/addons/calendar/components/reminder-time-modal/reminder-time-modal.html b/src/addons/calendar/components/reminder-time-modal/reminder-time-modal.html
index 3002fc5fe..052241aa9 100644
--- a/src/addons/calendar/components/reminder-time-modal/reminder-time-modal.html
+++ b/src/addons/calendar/components/reminder-time-modal/reminder-time-modal.html
@@ -11,49 +11,52 @@
     </ion-toolbar>
 </ion-header>
 <ion-content>
-    <ion-radio-group [(ngModel)]="radioValue" class="ion-text-wrap">
-        <!-- Preset options. -->
-        <ion-item *ngIf="allowDisable">
-            <ion-label>
-                <p>{{ 'core.settings.disabled' | translate }}</p>
-            </ion-label>
-            <ion-radio slot="end" value="disabled"></ion-radio>
-        </ion-item>
-        <ion-item *ngFor="let option of presetOptions">
-            <ion-label>
-                <p>{{ option.label }}</p>
-            </ion-label>
-            <ion-radio slot="end" [value]="option.radioValue"></ion-radio>
-        </ion-item>
+    <form (ngSubmit)="saveReminder()">
+        <ion-radio-group name="radiovalue" [(ngModel)]="radioValue" class="ion-text-wrap">
+            <!-- Preset options. -->
+            <ion-item *ngIf="allowDisable">
+                <ion-label>
+                    <p>{{ 'core.settings.disabled' | translate }}</p>
+                </ion-label>
+                <ion-radio slot="end" value="disabled"></ion-radio>
+            </ion-item>
+            <ion-item *ngFor="let option of presetOptions">
+                <ion-label>
+                    <p>{{ option.label }}</p>
+                </ion-label>
+                <ion-radio slot="end" [value]="option.radioValue"></ion-radio>
+            </ion-item>
 
-        <!-- Custom value. -->
-        <ion-item class="ion-text-wrap">
-            <ion-label>
-                <p>{{ 'core.custom' | translate }}</p>
-            </ion-label>
-            <ion-radio slot="end" value="custom"></ion-radio>
-        </ion-item>
-        <ion-item class="ion-text-wrap">
-            <ion-label></ion-label>
+            <!-- Custom value. -->
+            <ion-item class="ion-text-wrap">
+                <ion-label>
+                    <p>{{ 'core.custom' | translate }}</p>
+                </ion-label>
+                <ion-radio slot="end" value="custom"></ion-radio>
+            </ion-item>
+            <ion-item class="ion-text-wrap">
+                <ion-label></ion-label>
 
-            <div class="flex-row">
-                <!-- Input to enter the value. -->
-                <ion-input type="number" name="customvalue" [(ngModel)]="customValue" [disabled]="radioValue != 'custom'" placeholder="10">
-                </ion-input>
+                <div class="flex-row">
+                    <!-- Input to enter the value. -->
+                    <ion-input type="number" name="customvalue" [(ngModel)]="customValue" [disabled]="radioValue != 'custom'"
+                        placeholder="10" (click)="customInputClicked($event)">
+                    </ion-input>
 
-                <!-- Units. -->
-                <label class="accesshide" for="reminderUnits">{{ 'addon.calendar.units' | translate }}</label>
-                <ion-select id="reminderUnits" name="customunits" [(ngModel)]="customUnits" interface="action-sheet"
-                    [disabled]="radioValue != 'custom'" slot="end" [interfaceOptions]="{header: 'addon.calendar.units' | translate}">
-                    <ion-select-option *ngFor="let option of customUnitsOptions" [value]="option.value">
-                        {{ option.label | translate }}
-                    </ion-select-option>
-                </ion-select>
-            </div>
-        </ion-item>
-    </ion-radio-group>
+                    <!-- Units. -->
+                    <label class="accesshide" for="reminderUnits">{{ 'addon.calendar.units' | translate }}</label>
+                    <ion-select id="reminderUnits" name="customunits" [(ngModel)]="customUnits" interface="action-sheet"
+                        [disabled]="radioValue != 'custom'" slot="end" [interfaceOptions]="{header: 'addon.calendar.units' | translate}">
+                        <ion-select-option *ngFor="let option of customUnitsOptions" [value]="option.value">
+                            {{ option.label | translate }}
+                        </ion-select-option>
+                    </ion-select>
+                </div>
+            </ion-item>
+        </ion-radio-group>
 
-    <ion-button class="ion-margin" expand="block" (click)="saveReminder()" [disabled]="radioValue == 'custom' && !customValue">
-        {{ 'core.done' | translate }}
-    </ion-button>
+        <ion-button type="submit" class="ion-margin" expand="block" [disabled]="radioValue == 'custom' && !customValue">
+            {{ 'core.done' | translate }}
+        </ion-button>
+    </form>
 </ion-content>
diff --git a/src/addons/calendar/components/reminder-time-modal/reminder-time-modal.ts b/src/addons/calendar/components/reminder-time-modal/reminder-time-modal.ts
index f505fde21..871530664 100644
--- a/src/addons/calendar/components/reminder-time-modal/reminder-time-modal.ts
+++ b/src/addons/calendar/components/reminder-time-modal/reminder-time-modal.ts
@@ -15,6 +15,7 @@
 import { AddonCalendar, AddonCalendarReminderUnits, AddonCalendarValueAndUnit } from '@addons/calendar/services/calendar';
 import { Component, Input, OnInit } from '@angular/core';
 import { CoreDomUtils } from '@services/utils/dom';
+import { CoreUtils } from '@services/utils/utils';
 import { ModalController } from '@singletons';
 
 /**
@@ -153,4 +154,24 @@ export class AddonCalendarReminderTimeModalComponent implements OnInit {
         }
     }
 
+    /**
+     * Custom value input clicked.
+     *
+     * @param ev Click event.
+     */
+    async customInputClicked(ev: Event): Promise<void> {
+        if (this.radioValue === 'custom') {
+            return;
+        }
+
+        this.radioValue = 'custom';
+
+        await CoreUtils.nextTick();
+
+        const target = <HTMLInputElement | Element | null> ev.target;
+        if (target && 'focus' in target) {
+            target.focus();
+        }
+    }
+
 }
diff --git a/src/addons/calendar/pages/day/day.page.ts b/src/addons/calendar/pages/day/day.page.ts
index be2c15588..5c7e7c4b9 100644
--- a/src/addons/calendar/pages/day/day.page.ts
+++ b/src/addons/calendar/pages/day/day.page.ts
@@ -374,7 +374,9 @@ export class AddonCalendarDayPage implements OnInit, OnDestroy {
 
             const selectedDay = this.manager?.getSelectedItem();
             if (selectedDay) {
-                params.timestamp = selectedDay.moment.unix() * 1000;
+                // Use current time but in the specified day.
+                const now = moment();
+                params.timestamp = selectedDay.moment.clone().set({ hour: now.hour(), minute: now.minute() }).unix() * 1000;
             }
         }
 
diff --git a/src/addons/calendar/pages/edit-event/edit-event.page.ts b/src/addons/calendar/pages/edit-event/edit-event.page.ts
index d7bcfd094..c1807d35f 100644
--- a/src/addons/calendar/pages/edit-event/edit-event.page.ts
+++ b/src/addons/calendar/pages/edit-event/edit-event.page.ts
@@ -520,7 +520,7 @@ export class AddonCalendarEditEventPage implements OnInit, OnDestroy, CanLeave {
 
         try {
             const result = await AddonCalendar.submitEvent(this.eventId, data, {
-                reminders: this.reminders,
+                reminders: this.eventId ? [] : this.reminders, // Only allow adding reminders for new events.
             });
             event = result.event;
 
@@ -638,7 +638,8 @@ export class AddonCalendarEditEventPage implements OnInit, OnDestroy, CanLeave {
      * @return Promise resolved when done.
      */
     protected async initReminders(): Promise<void> {
-        if (!this.notificationsEnabled) {
+        // Don't init reminders when editing an event. Right now, only allow adding reminders for new events.
+        if (!this.notificationsEnabled || this.eventId) {
             return;
         }
 
diff --git a/src/addons/calendar/pages/event/event.html b/src/addons/calendar/pages/event/event.html
index 0b21ac1f4..ab3c5bcb8 100644
--- a/src/addons/calendar/pages/event/event.html
+++ b/src/addons/calendar/pages/event/event.html
@@ -136,7 +136,8 @@
             <ng-container *ngFor="let reminder of reminders">
                 <ion-item *ngIf="reminder.timestamp > 0" class="ion-text-wrap" [class.item-dimmed]="reminder.timestamp <= currentTime">
                     <ion-label>
-                        <p>{{ reminder.label }}</p>
+                        <p class="item-heading">{{ reminder.label }}</p>
+                        <p *ngIf="reminder.sublabel">{{ reminder.sublabel }}</p>
                     </ion-label>
                     <ion-button fill="clear" (click)="cancelNotification(reminder.id, $event)" [attr.aria-label]="'core.delete' | translate"
                         slot="end">
diff --git a/src/addons/calendar/services/calendar-helper.ts b/src/addons/calendar/services/calendar-helper.ts
index a4f3a9479..dce3c6fc5 100644
--- a/src/addons/calendar/services/calendar-helper.ts
+++ b/src/addons/calendar/services/calendar-helper.ts
@@ -37,6 +37,7 @@ import { AddonCalendarSyncInvalidateEvent } from './calendar-sync';
 import { AddonCalendarOfflineEventDBRecord } from './database/calendar-offline';
 import { CoreCategoryData } from '@features/courses/services/courses';
 import { AddonCalendarReminderDBRecord } from './database/calendar';
+import { CoreTimeUtils } from '@services/utils/time';
 
 /**
  * Context levels enumeration.
@@ -329,6 +330,9 @@ export class AddonCalendarHelperProvider {
 
             if (reminder.value && reminder.unit) {
                 reminder.label = AddonCalendar.getUnitValueLabel(reminder.value, reminder.unit, reminder.time === null);
+                if (reminder.timestamp) {
+                    reminder.sublabel = CoreTimeUtils.userDate(reminder.timestamp * 1000, 'core.strftimedatetime');
+                }
             }
 
             return reminder;
@@ -796,4 +800,5 @@ export type AddonCalendarEventReminder = AddonCalendarReminderDBRecord & {
     unit?: AddonCalendarReminderUnits; // Units.
     timestamp?: number; // Timestamp (in seconds).
     label?: string; // Label to represent the reminder.
+    sublabel?: string; // Sub label.
 };
diff --git a/src/addons/calendar/services/calendar.ts b/src/addons/calendar/services/calendar.ts
index ec8c8db11..d010a96d9 100644
--- a/src/addons/calendar/services/calendar.ts
+++ b/src/addons/calendar/services/calendar.ts
@@ -777,6 +777,7 @@ export class AddonCalendarProvider {
         const reminder: Partial<AddonCalendarReminderDBRecord> = {
             eventid: event.id,
             time: time ?? null,
+            timecreated: Date.now(),
         };
 
         const reminderId = await site.getDb().insertRecord(REMINDERS_TABLE, reminder);
@@ -913,7 +914,7 @@ export class AddonCalendarProvider {
     async getEventReminders(id: number, siteId?: string): Promise<AddonCalendarReminderDBRecord[]> {
         const site = await CoreSites.getSite(siteId);
 
-        return await site.getDb().getRecords(REMINDERS_TABLE, { eventid: id }, 'time ASC');
+        return await site.getDb().getRecords(REMINDERS_TABLE, { eventid: id }, 'timecreated ASC, time ASC');
     }
 
     /**
@@ -1696,7 +1697,7 @@ export class AddonCalendarProvider {
             const event = await AddonCalendarOffline.saveEvent(eventId, formData, siteId);
 
             // Now save the reminders if any.
-            if (options.reminders) {
+            if (options.reminders?.length) {
                 await CoreUtils.ignoreErrors(
                     Promise.all(options.reminders.map((reminder) => this.addEventReminder(event, reminder.time, siteId))),
                 );
@@ -1718,7 +1719,7 @@ export class AddonCalendarProvider {
             const event = await this.submitEventOnline(eventId, formData, siteId);
 
             // Now save the reminders if any.
-            if (options.reminders) {
+            if (options.reminders?.length) {
                 await CoreUtils.ignoreErrors(
                     Promise.all(options.reminders.map((reminder) => this.addEventReminder(event, reminder.time, siteId))),
                 );
diff --git a/src/addons/calendar/services/database/calendar.ts b/src/addons/calendar/services/database/calendar.ts
index b21928140..1349eb9be 100644
--- a/src/addons/calendar/services/database/calendar.ts
+++ b/src/addons/calendar/services/database/calendar.ts
@@ -22,7 +22,7 @@ import { AddonCalendar, AddonCalendarEventType, AddonCalendarProvider } from '..
  * Database variables for AddonCalendarProvider service.
  */
 export const EVENTS_TABLE = 'addon_calendar_events_3';
-export const REMINDERS_TABLE = 'addon_calendar_reminders';
+export const REMINDERS_TABLE = 'addon_calendar_reminders_2';
 export const CALENDAR_SITE_SCHEMA: CoreSiteSchema = {
     name: 'AddonCalendarProvider',
     version: 4,
@@ -195,6 +195,10 @@ export const CALENDAR_SITE_SCHEMA: CoreSiteSchema = {
                     name: 'time',
                     type: 'INTEGER',
                 },
+                {
+                    name: 'timecreated',
+                    type: 'INTEGER',
+                },
             ],
             uniqueKeys: [
                 ['eventid', 'time'],
@@ -228,7 +232,16 @@ export const CALENDAR_SITE_SCHEMA: CoreSiteSchema = {
             }
 
             // Migrate reminders. New format @since 4.0.
-            const records = await db.getAllRecords<AddonCalendarReminderDBRecord>(REMINDERS_TABLE);
+            const oldTable = 'addon_calendar_reminders';
+
+            try {
+                await db.tableExists(oldTable);
+            } catch (error) {
+                // Old table does not exist, ignore.
+                return;
+            }
+
+            const records = await db.getAllRecords<AddonCalendarReminderDBRecord>(oldTable);
             const events: Record<number, AddonCalendarEventDBRecord> = {};
 
             await Promise.all(records.map(async (record) => {
@@ -237,9 +250,7 @@ export const CALENDAR_SITE_SCHEMA: CoreSiteSchema = {
                     try {
                         events[record.eventid] = await db.getRecord(EVENTS_TABLE, { id: record.eventid });
                     } catch {
-                        // Event not found in local DB, shouldn't happen. Delete the reminder.
-                        await db.deleteRecords(REMINDERS_TABLE, { id: record.id });
-
+                        // Event not found in local DB, shouldn't happen. Ignore the reminder.
                         return;
                     }
                 }
@@ -248,9 +259,7 @@ export const CALENDAR_SITE_SCHEMA: CoreSiteSchema = {
                     // Default reminder. Use null now.
                     record.time = null;
                 } else if (record.time > events[record.eventid].timestart) {
-                    // Reminder is after the event, delete it.
-                    await db.deleteRecords(REMINDERS_TABLE, { id: record.id });
-
+                    // Reminder is after the event, ignore it.
                     return;
                 } else {
                     // Remove seconds from the old reminder, it could include seconds by mistake.
@@ -259,6 +268,12 @@ export const CALENDAR_SITE_SCHEMA: CoreSiteSchema = {
 
                 return db.insertRecord(REMINDERS_TABLE, record);
             }));
+
+            try {
+                await db.dropTable(oldTable);
+            } catch (error) {
+                // Error deleting old table, ignore.
+            }
         }
     },
 };
@@ -308,4 +323,5 @@ export type AddonCalendarReminderDBRecord = {
     id: number;
     eventid: number;
     time: number | null; // Number of seconds before the event, null for default time.
+    timecreated?: number | null;
 };