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diff --git a/date-fns/src/locale/ja/_lib/localize/index.js b/date-fns/src/locale/ja/_lib/localize/index.js
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+++ b/date-fns/src/locale/ja/_lib/localize/index.js
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+import buildLocalizeFn from '../../../_lib/buildLocalizeFn/index'
+
+var eraValues = {
+  narrow: ['BC', 'AC'],
+  abbreviated: ['紀元前', '西暦'],
+  wide: ['紀元前', '西暦'],
+}
+
+var quarterValues = {
+  narrow: ['1', '2', '3', '4'],
+  abbreviated: ['Q1', 'Q2', 'Q3', 'Q4'],
+  wide: ['第1四半期', '第2四半期', '第3四半期', '第4四半期'],
+}
+
+var monthValues = {
+  narrow: ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12'],
+  abbreviated: [
+    '1月',
+    '2月',
+    '3月',
+    '4月',
+    '5月',
+    '6月',
+    '7月',
+    '8月',
+    '9月',
+    '10月',
+    '11月',
+    '12月',
+  ],
+  wide: [
+    '1月',
+    '2月',
+    '3月',
+    '4月',
+    '5月',
+    '6月',
+    '7月',
+    '8月',
+    '9月',
+    '10月',
+    '11月',
+    '12月',
+  ],
+}
+
+var dayValues = {
+  narrow: ['日', '月', '火', '水', '木', '金', '土'],
+  short: ['日', '月', '火', '水', '木', '金', '土'],
+  abbreviated: ['日', '月', '火', '水', '木', '金', '土'],
+  wide: ['日曜日', '月曜日', '火曜日', '水曜日', '木曜日', '金曜日', '土曜日'],
+}
+
+var dayPeriodValues = {
+  narrow: {
+    am: '午前',
+    pm: '午後',
+    midnight: '深夜',
+    noon: '正午',
+    morning: '朝',
+    afternoon: '午後',
+    evening: '夜',
+    night: '深夜',
+  },
+  abbreviated: {
+    am: '午前',
+    pm: '午後',
+    midnight: '深夜',
+    noon: '正午',
+    morning: '朝',
+    afternoon: '午後',
+    evening: '夜',
+    night: '深夜',
+  },
+  wide: {
+    am: '午前',
+    pm: '午後',
+    midnight: '深夜',
+    noon: '正午',
+    morning: '朝',
+    afternoon: '午後',
+    evening: '夜',
+    night: '深夜',
+  },
+}
+var formattingDayPeriodValues = {
+  narrow: {
+    am: '午前',
+    pm: '午後',
+    midnight: '深夜',
+    noon: '正午',
+    morning: '朝',
+    afternoon: '午後',
+    evening: '夜',
+    night: '深夜',
+  },
+  abbreviated: {
+    am: '午前',
+    pm: '午後',
+    midnight: '深夜',
+    noon: '正午',
+    morning: '朝',
+    afternoon: '午後',
+    evening: '夜',
+    night: '深夜',
+  },
+  wide: {
+    am: '午前',
+    pm: '午後',
+    midnight: '深夜',
+    noon: '正午',
+    morning: '朝',
+    afternoon: '午後',
+    evening: '夜',
+    night: '深夜',
+  },
+}
+
+function ordinalNumber(dirtyNumber, dirtyOptions) {
+  var number = Number(dirtyNumber)
+
+  // If ordinal numbers depend on context, for example,
+  // if they are different for different grammatical genders,
+  // use `options.unit`:
+  //
+  //   var options = dirtyOptions || {}
+  //   var unit = String(options.unit)
+  //
+  // where `unit` can be 'year', 'quarter', 'month', 'week', 'date', 'dayOfYear',
+  // 'day', 'hour', 'minute', 'second'
+
+  var options = dirtyOptions || {}
+  var unit = String(options.unit)
+
+  if (unit === 'date') {
+    return number + '日'
+  }
+
+  if (unit === 'year') {
+    return number + '年'
+  }
+
+  return number
+}
+
+var localize = {
+  ordinalNumber: ordinalNumber,
+
+  era: buildLocalizeFn({
+    values: eraValues,
+    defaultWidth: 'wide',
+  }),
+
+  quarter: buildLocalizeFn({
+    values: quarterValues,
+    defaultWidth: 'wide',
+    argumentCallback: function (quarter) {
+      return Number(quarter) - 1
+    },
+  }),
+
+  month: buildLocalizeFn({
+    values: monthValues,
+    defaultWidth: 'wide',
+  }),
+
+  day: buildLocalizeFn({
+    values: dayValues,
+    defaultWidth: 'wide',
+  }),
+
+  dayPeriod: buildLocalizeFn({
+    values: dayPeriodValues,
+    defaultWidth: 'wide',
+    formattingValues: formattingDayPeriodValues,
+    defaultFormattingWidth: 'wide',
+  }),
+}
+
+export default localize