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frontend/node_modules/antd/es/date-picker/locale/ja_JP.js

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+import CalendarLocale from "rc-picker/es/locale/ja_JP";
+import TimePickerLocale from '../../time-picker/locale/ja_JP';
+// Merge into a locale object
+const locale = {
+  lang: Object.assign({
+    placeholder: '日付を選択',
+    yearPlaceholder: '年を選択',
+    quarterPlaceholder: '四半期を選択',
+    monthPlaceholder: '月を選択',
+    weekPlaceholder: '週を選択',
+    rangePlaceholder: ['開始日付', '終了日付'],
+    rangeYearPlaceholder: ['開始年', '終了年'],
+    rangeMonthPlaceholder: ['開始月', '終了月'],
+    rangeQuarterPlaceholder: ['開始四半期', '終了四半期'],
+    rangeWeekPlaceholder: ['開始週', '終了週'],
+    shortWeekDays: ['日', '月', '火', '水', '木', '金', '土'],
+    shortMonths: ['1月', '2月', '3月', '4月', '5月', '6月', '7月', '8月', '9月', '10月', '11月', '12月']
+  }, CalendarLocale),
+  timePickerLocale: Object.assign({}, TimePickerLocale)
+};
+// All settings at:
+// https://github.com/ant-design/ant-design/blob/master/components/date-picker/locale/example.json
+export default locale;