標準時とローカルタイムの変換を書いたつもり

Author: Fukusan64

src/components/EditAchievement.vue

@@ -111,6 +111,7 @@
 <script>
 import { mapState, mapActions } from 'vuex';
 import { debounceTime } from 'rxjs/operators';
+import moment from 'moment';
 import ErrorMessage from '@/components/ErrorMessage.vue';
 import Multiselect from 'vue-multiselect';
 import ImageSelector from '@/components/ImageSelector.vue';
@@ -151,11 +152,11 @@ export default {
         if (!this.achievement.happened_at) {
           return null;
         }
-        const date = this.achievement.happened_at.substring(0, '2019-01-01'.length);
-        return date;
+        return moment(this.achievement.happened_at).local().format('YYYY-MM-DD');
       },
       set(newValue) {
-        this.achievement.happened_at = `${newValue}T09:00:00Z`;
+        const UTCDate = moment(newValue).utc().format('YYYY-MM-DD[T]HH:mm:ss[Z]');
+        this.achievement.happened_at = UTCDate;
       },
     },
     isImageTooLarge() {