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 616c65e37..fa21d737d 100644
--- a/src/addons/calendar/pages/edit-event/edit-event.page.ts
+++ b/src/addons/calendar/pages/edit-event/edit-event.page.ts
@@ -450,8 +450,8 @@ export class AddonCalendarEditEventPage implements OnInit, OnDestroy, CanLeave {
     async submit(): Promise<void> {
         // Validate data.
         const formData = this.form.value;
-        const timeStartDate = CoreTimeUtils.convertToTimestamp(formData.timestart);
-        const timeUntilDate = CoreTimeUtils.convertToTimestamp(formData.timedurationuntil);
+        const timeStartDate = CoreTimeUtils.convertToTimestamp(formData.timestart, true);
+        const timeUntilDate = CoreTimeUtils.convertToTimestamp(formData.timedurationuntil, true);
         const timeDurationMinutes = parseInt(formData.timedurationminutes || '', 10);
         let error: string | undefined;
 
diff --git a/src/core/services/utils/time.ts b/src/core/services/utils/time.ts
index c9202cb72..b0c8ae3a2 100644
--- a/src/core/services/utils/time.ts
+++ b/src/core/services/utils/time.ts
@@ -328,15 +328,23 @@ export class CoreTimeUtilsProvider {
     /**
      * Convert a text into user timezone timestamp.
      *
+     * @todo The `applyOffset` argument is only used as a workaround, it should be removed once
+     * MOBILE-3784 is resolved.
+     *
      * @param date To convert to timestamp.
+     * @param applyOffset Whether to apply offset to date or not.
      * @return Converted timestamp.
      */
-    convertToTimestamp(date: string): number {
-        if (typeof date == 'string' && date.slice(-1) == 'Z') {
-            return moment(date).unix() - (moment().utcOffset() * 60);
+    convertToTimestamp(date: string, applyOffset?: boolean): number {
+        const timestamp = moment(date).unix();
+
+        if (typeof applyOffset !== 'undefined') {
+            return applyOffset ? timestamp - moment().utcOffset() * 60 : timestamp;
         }
 
-        return moment(date).unix();
+        return typeof date == 'string' && date.slice(-1) == 'Z'
+            ? timestamp - moment().utcOffset() * 60
+            : timestamp;
     }
 
     /**