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diff --git a/date-fns/src/locale/cy/_lib/localize/index.js b/date-fns/src/locale/cy/_lib/localize/index.js
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+import buildLocalizeFn from '../../../_lib/buildLocalizeFn/index'
+
+var eraValues = {
+  narrow: ['C', 'O'],
+  abbreviated: ['CC', 'OC'],
+  wide: ['Cyn Crist', 'Ar ôl Crist']
+}
+
+var quarterValues = {
+  narrow: ['1', '2', '3', '4'],
+  abbreviated: ['Ch1', 'Ch2', 'Ch3', 'Ch4'],
+  wide: ['Chwarter 1af', '2ail chwarter', '3ydd chwarter', '4ydd chwarter']
+}
+
+// Note: in English, the names of days of the week and months are capitalized.
+// If you are making a new locale based on this one, check if the same is true for the language you're working on.
+// Generally, formatted dates should look like they are in the middle of a sentence,
+// e.g. in Spanish language the weekdays and months should be in the lowercase.
+var monthValues = {
+  narrow: ['I', 'Ch', 'Ma', 'E', 'Mi', 'Me', 'G', 'A', 'Md', 'H', 'T', 'Rh'],
+  abbreviated: [
+    'Ion',
+    'Chwe',
+    'Maw',
+    'Ebr',
+    'Mai',
+    'Meh',
+    'Gor',
+    'Aws',
+    'Med',
+    'Hyd',
+    'Tach',
+    'Rhag'
+  ],
+  wide: [
+    'Ionawr',
+    'Chwefror',
+    'Mawrth',
+    'Ebrill',
+    'Mai',
+    'Mehefin',
+    'Gorffennaf',
+    'Awst',
+    'Medi',
+    'Hydref',
+    'Tachwedd',
+    'Rhagfyr'
+  ]
+}
+
+var dayValues = {
+  narrow: ['S', 'Ll', 'M', 'M', 'I', 'G', 'S'],
+  short: ['Su', 'Ll', 'Ma', 'Me', 'Ia', 'Gw', 'Sa'],
+  abbreviated: ['Sul', 'Llun', 'Maw', 'Mer', 'Iau', 'Gwe', 'Sad'],
+  wide: [
+    'dydd Sul',
+    'dydd Llun',
+    'dydd Mawrth',
+    'dydd Mercher',
+    'dydd Iau',
+    'dydd Gwener',
+    'dydd Sadwrn'
+  ]
+}
+
+var dayPeriodValues = {
+  narrow: {
+    am: 'b',
+    pm: 'h',
+    midnight: 'hn',
+    noon: 'hd',
+    morning: 'bore',
+    afternoon: 'prynhawn',
+    evening: "gyda'r nos",
+    night: 'nos'
+  },
+  abbreviated: {
+    am: 'yb',
+    pm: 'yh',
+    midnight: 'hanner nos',
+    noon: 'hanner dydd',
+    morning: 'bore',
+    afternoon: 'prynhawn',
+    evening: "gyda'r nos",
+    night: 'nos'
+  },
+  wide: {
+    am: 'y.b.',
+    pm: 'y.h.',
+    midnight: 'hanner nos',
+    noon: 'hanner dydd',
+    morning: 'bore',
+    afternoon: 'prynhawn',
+    evening: "gyda'r nos",
+    night: 'nos'
+  }
+}
+var formattingDayPeriodValues = {
+  narrow: {
+    am: 'b',
+    pm: 'h',
+    midnight: 'hn',
+    noon: 'hd',
+    morning: 'yn y bore',
+    afternoon: 'yn y prynhawn',
+    evening: "gyda'r nos",
+    night: 'yn y nos'
+  },
+  abbreviated: {
+    am: 'yb',
+    pm: 'yh',
+    midnight: 'hanner nos',
+    noon: 'hanner dydd',
+    morning: 'yn y bore',
+    afternoon: 'yn y prynhawn',
+    evening: "gyda'r nos",
+    night: 'yn y nos'
+  },
+  wide: {
+    am: 'y.b.',
+    pm: 'y.h.',
+    midnight: 'hanner nos',
+    noon: 'hanner dydd',
+    morning: 'yn y bore',
+    afternoon: 'yn y prynhawn',
+    evening: "gyda'r nos",
+    night: 'yn y nos'
+  }
+}
+
+function ordinalNumber(dirtyNumber, _dirtyOptions) {
+  var number = Number(dirtyNumber)
+
+  if (number < 20) {
+    switch (number) {
+      case 0:
+        return number + 'fed'
+      case 1:
+        return number + 'af'
+      case 2:
+        return number + 'ail'
+      case 3:
+      case 4:
+        return number + 'ydd'
+      case 5:
+      case 6:
+        return number + 'ed'
+      case 7:
+      case 8:
+      case 9:
+      case 10:
+      case 12:
+      case 15:
+      case 18:
+        return number + 'fed'
+      case 11:
+      case 13:
+      case 14:
+      case 16:
+      case 17:
+      case 19:
+        return number + 'eg'
+    }
+  } else if ((number >= 50 && number <= 60) || number === 80 || number >= 100) {
+    return number + 'fed'
+  }
+  return number + 'ain'
+}
+
+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