Move "core" folder out of "features" into "base"

src/base/utils/DateHelper.ts

@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+import dayjs, { Dayjs } from 'dayjs';
+import { t } from 'i18next';
+
+export const timeFormatter = new Intl.DateTimeFormat(navigator.language, { hour: '2-digit', minute: '2-digit' });
+export const dateFormatter = new Intl.DateTimeFormat(navigator.language, {
+    year: 'numeric',
+    month: '2-digit',
+    day: '2-digit',
+});
+export const dateTimeFormatter = new Intl.DateTimeFormat(navigator.language, {
+    year: 'numeric',
+    month: '2-digit',
+    day: '2-digit',
+    hour: '2-digit',
+    minute: '2-digit',
+});
+
+export const epochToDate = (epoch: number): Dayjs => dayjs.unix(epoch);
+
+export const isSameDay = (first: Dayjs, second: Dayjs): boolean => first.isSame(second, 'day');
+
+/**
+ * Returns a string in localized format for the passed date.
+ *
+ * In case the date is from today or yesterday a special string will be returned including "Today"
+ * or "Yesterday".
+ * Optionally this special string can include the localized time of the passed date ("Today/Yesterday at HH:mm").
+ *
+ * @example
+ * const today = dayjs();
+ * const yesterday = today.subtract(1, 'day');
+ * const someDate = dayjs('1377-04-20');
+ *
+ * const todayAsString = getDateString(today); // => "Today"
+ * const yesterdayAsString = getDateString(yesterday, true) // => "Yesterday at 02:50 AM"
+ * const someDate = getDateString(someDate) // => "04/20/1337"
+ *
+ *
+ * @param date
+ * @param withTime
+ */
+export const getDateString = (date: Dayjs | number, withTime: boolean = false) => {
+    const actualDate = date instanceof dayjs ? date : dayjs(date);
+    const timeString = timeFormatter.format(actualDate.toDate());
+
+    if (actualDate.isToday()) {
+        if (withTime) {
+            return t('global.date.label.today_at', { timeString });
+        }
+
+        return t('global.date.label.today');
+    }
+
+    if (actualDate.isYesterday()) {
+        if (withTime) {
+            return t('global.date.label.yesterday_at', { timeString });
+        }
+
+        return t('global.date.label.yesterday');
+    }
+
+    return dateFormatter.format(actualDate.toDate());
+};