diff --git a/src/addon/calendar/pages/edit-event/edit-event.ts b/src/addon/calendar/pages/edit-event/edit-event.ts
index 2daaf90cf..99b887ac8 100644
--- a/src/addon/calendar/pages/edit-event/edit-event.ts
+++ b/src/addon/calendar/pages/edit-event/edit-event.ts
@@ -423,8 +423,8 @@ export class AddonCalendarEditEventPage implements OnInit, OnDestroy {
     submit(): void {
         // Validate data.
         const formData = this.eventForm.value,
-            timeStartDate = new Date(formData.timestart),
-            timeUntilDate = this.timeUtils.datetimeToDate(formData.timedurationuntil),
+            timeStartDate = this.timeUtils.convertToTimestamp(formData.timestart),
+            timeUntilDate = this.timeUtils.convertToTimestamp(formData.timedurationuntil),
             timeDurationMinutes = parseInt(formData.timedurationminutes || '', 10);
         let error;
 
@@ -436,7 +436,7 @@ export class AddonCalendarEditEventPage implements OnInit, OnDestroy {
             error = 'core.selectagroup';
         } else if (formData.eventtype == AddonCalendarProvider.TYPE_CATEGORY && !formData.categoryid) {
             error = 'core.selectacategory';
-        } else if (formData.duration == 1 && timeStartDate.getTime() > timeUntilDate.getTime()) {
+        } else if (formData.duration == 1 && timeStartDate > timeUntilDate) {
             error = 'addon.calendar.invalidtimedurationuntil';
         } else if (formData.duration == 2 && (isNaN(timeDurationMinutes) || timeDurationMinutes < 1)) {
             error = 'addon.calendar.invalidtimedurationminutes';
@@ -453,7 +453,7 @@ export class AddonCalendarEditEventPage implements OnInit, OnDestroy {
         const data: any = {
             name: formData.name,
             eventtype: formData.eventtype,
-            timestart: Math.floor(timeStartDate.getTime() / 1000),
+            timestart: timeStartDate,
             description: {
                 text: formData.description,
                 format: 1
@@ -473,7 +473,7 @@ export class AddonCalendarEditEventPage implements OnInit, OnDestroy {
         }
 
         if (formData.duration == 1) {
-            data.timedurationuntil = Math.floor(timeUntilDate.getTime() / 1000);
+            data.timedurationuntil = timeUntilDate;
         } else if (formData.duration == 2) {
             data.timedurationminutes = formData.timedurationminutes;
         }
diff --git a/src/addon/userprofilefield/datetime/providers/handler.ts b/src/addon/userprofilefield/datetime/providers/handler.ts
index 65a7a6f66..29d3d321e 100644
--- a/src/addon/userprofilefield/datetime/providers/handler.ts
+++ b/src/addon/userprofilefield/datetime/providers/handler.ts
@@ -14,6 +14,7 @@
 // limitations under the License.
 import { Injectable, Injector } from '@angular/core';
 import { CoreUserProfileFieldHandler, CoreUserProfileFieldHandlerData } from '@core/user/providers/user-profile-field-delegate';
+import { CoreTimeUtilsProvider } from '@providers/utils/time';
 import { AddonUserProfileFieldDatetimeComponent } from '../component/datetime';
 
 /**
@@ -24,7 +25,7 @@ export class AddonUserProfileFieldDatetimeHandler implements CoreUserProfileFiel
     name = 'AddonUserProfileFieldDatetime';
     type = 'datetime';
 
-    constructor() {
+    constructor(protected timeUtils: CoreTimeUtilsProvider) {
         // Nothing to do.
     }
 
@@ -50,12 +51,10 @@ export class AddonUserProfileFieldDatetimeHandler implements CoreUserProfileFiel
         const name = 'profile_field_' + field.shortname;
 
         if (formValues[name]) {
-            const milliseconds = new Date(formValues[name]).getTime();
-
             return {
                 type: 'datetime',
                 name: 'profile_field_' + field.shortname,
-                value: Math.round(milliseconds / 1000)
+                value: this.timeUtils.convertToTimestamp(formValues[name])
             };
         }
     }
diff --git a/src/components/ion-tabs/ion-tabs.scss b/src/components/ion-tabs/ion-tabs.scss
index 6b16d9401..31f667650 100644
--- a/src/components/ion-tabs/ion-tabs.scss
+++ b/src/components/ion-tabs/ion-tabs.scss
@@ -3,7 +3,6 @@ $core-sidetab-size: 60px !default;
 ion-app.app-root core-ion-tabs {
     .tabbar {
         z-index: 101; // For some reason, the regular z-index isn't enough with our tabs, use a higher one.
-        height: 56px;
 
         .core-ion-tabs-loading {
             height: 100%;
diff --git a/src/providers/utils/time.ts b/src/providers/utils/time.ts
index 6e2e00aa7..9be16dd58 100644
--- a/src/providers/utils/time.ts
+++ b/src/providers/utils/time.ts
@@ -308,22 +308,7 @@ export class CoreTimeUtilsProvider {
     toDatetimeFormat(timestamp?: number): string {
         timestamp = timestamp || Date.now();
 
-        return this.userDate(timestamp, 'YYYY-MM-DDTHH:mm:ss.SSS', false);
-    }
-
-    /**
-     * Convert the value of a ion-datetime to a Date.
-     *
-     * @param {string} value Value of ion-datetime.
-     * @return {Date} Date.
-     */
-    datetimeToDate(value: string): Date {
-        if (typeof value == 'string' && value.slice(-1) == 'Z') {
-            // The value shoudln't have the timezone because it causes problems, remove it.
-            value = value.substr(0, value.length - 1);
-        }
-
-        return new Date(value);
+        return this.userDate(timestamp, 'YYYY-MM-DDTHH:mm:ss.SSS', false) + 'Z';
     }
 
     /**
@@ -333,7 +318,11 @@ export class CoreTimeUtilsProvider {
      * @return {number} Converted timestamp.
      */
     convertToTimestamp(date: string): number {
-        return moment(date).unix() - (moment().utcOffset() * 60);
+        if (typeof date == 'string' && date.slice(-1) == 'Z') {
+            return moment(date).unix() - (moment().utcOffset() * 60);
+        }
+
+        return moment(date).unix();
     }
 
     /**