diff --git a/src/locale/ar.js b/src/locale/ar.js
index 3a7bb3851..a7025c442 100644
--- a/src/locale/ar.js
+++ b/src/locale/ar.js
@@ -2,6 +2,31 @@
 import dayjs from 'dayjs'
 
 const months = 'يناير_فبراير_مارس_أبريل_مايو_يونيو_يوليو_أغسطس_سبتمبر_أكتوبر_نوفمبر_ديسمبر'.split('_')
+const symbolMap = {
+  1: '١',
+  2: '٢',
+  3: '٣',
+  4: '٤',
+  5: '٥',
+  6: '٦',
+  7: '٧',
+  8: '٨',
+  9: '٩',
+  0: '٠'
+}
+
+const numberMap = {
+  '١': '1',
+  '٢': '2',
+  '٣': '3',
+  '٤': '4',
+  '٥': '5',
+  '٦': '6',
+  '٧': '7',
+  '٨': '8',
+  '٩': '9',
+  '٠': '0'
+}
 
 const locale = {
   name: 'ar',
@@ -26,6 +51,19 @@ const locale = {
     y: 'عام واحد',
     yy: '%d أعوام'
   },
+  preparse(string) {
+    return string
+      .replace(
+        /[١٢٣٤٥٦٧٨٩٠]/g,
+        match => numberMap[match]
+      )
+      .replace(/،/g, ',')
+  },
+  postformat(string) {
+    return string
+      .replace(/\d/g, match => symbolMap[match])
+      .replace(/,/g, '،')
+  },
   ordinal: n => n,
   formats: {
     LT: 'HH:mm',
diff --git a/src/plugin/preParsePostFormat/index.js b/src/plugin/preParsePostFormat/index.js
new file mode 100644
index 000000000..f8e96d586
--- /dev/null
+++ b/src/plugin/preParsePostFormat/index.js
@@ -0,0 +1,47 @@
+// Plugin template from https://day.js.org/docs/en/plugin/plugin
+export default (option, dayjsClass) => {
+  const oldParse = dayjsClass.prototype.parse
+  dayjsClass.prototype.parse = function (cfg) {
+    if (typeof cfg.date === 'string') {
+      const locale = this.$locale()
+      cfg.date =
+        locale && locale.preparse ? locale.preparse(cfg.date) : cfg.date
+    }
+    // original parse result
+    return oldParse.bind(this)(cfg)
+  }
+
+  // // overriding existing API
+  // // e.g. extend dayjs().format()
+  const oldFormat = dayjsClass.prototype.format
+  dayjsClass.prototype.format = function (...args) {
+    // original format result
+    const result = oldFormat.call(this, ...args)
+    // return modified result
+    const locale = this.$locale()
+    return locale && locale.postformat ? locale.postformat(result) : result
+  }
+
+  const oldFromTo = dayjsClass.prototype.fromToBase
+
+  if (oldFromTo) {
+    dayjsClass.prototype.fromToBase = function (
+      input,
+      withoutSuffix,
+      instance,
+      isFrom
+    ) {
+      const locale = this.$locale() || instance.$locale()
+
+      // original format result
+      return oldFromTo.call(
+        this,
+        input,
+        withoutSuffix,
+        instance,
+        isFrom,
+        locale && locale.postformat
+      )
+    }
+  }
+}
diff --git a/src/plugin/relativeTime/index.js b/src/plugin/relativeTime/index.js
index e11b67a8e..8d61c45b0 100644
--- a/src/plugin/relativeTime/index.js
+++ b/src/plugin/relativeTime/index.js
@@ -19,7 +19,7 @@ export default (o, c, d) => {
     yy: '%d years'
   }
   d.en.relativeTime = relObj
-  const fromTo = (input, withoutSuffix, instance, isFrom) => {
+  proto.fromToBase = (input, withoutSuffix, instance, isFrom, postFormat) => {
     const loc = instance.$locale().relativeTime || relObj
     const T = o.thresholds || [
       { l: 's', r: 44, d: C.S },
@@ -46,11 +46,14 @@ export default (o, c, d) => {
           ? d(input).diff(instance, t.d, true)
           : instance.diff(input, t.d, true)
       }
-      const abs = (o.rounding || Math.round)(Math.abs(result))
+      let abs = (o.rounding || Math.round)(Math.abs(result))
       isFuture = result > 0
       if (abs <= t.r || !t.r) {
         if (abs <= 1 && i > 0) t = T[i - 1] // 1 minutes -> a minute, 0 seconds -> 0 second
         const format = loc[t.l]
+        if (postFormat) {
+          abs = postFormat(`${abs}`)
+        }
         if (typeof format === 'string') {
           out = format.replace('%d', abs)
         } else {
@@ -66,6 +69,11 @@ export default (o, c, d) => {
     }
     return pastOrFuture.replace('%s', out)
   }
+
+  function fromTo(input, withoutSuffix, instance, isFrom) {
+    return proto.fromToBase(input, withoutSuffix, instance, isFrom)
+  }
+
   proto.to = function (input, withoutSuffix) {
     return fromTo(input, withoutSuffix, this, true)
   }
diff --git a/test/locale/ar.test.js b/test/locale/ar.test.js
new file mode 100644
index 000000000..3f9f60f0c
--- /dev/null
+++ b/test/locale/ar.test.js
@@ -0,0 +1,52 @@
+import moment from 'moment'
+import MockDate from 'mockdate'
+import dayjs from '../../src'
+import relativeTime from '../../src/plugin/relativeTime'
+import preParsePostFormat from '../../src/plugin/preParsePostFormat'
+import localeData from '../../src/plugin/localeData'
+import '../../src/locale/ar'
+
+dayjs.extend(localeData)
+dayjs.extend(relativeTime)
+dayjs.extend(preParsePostFormat)
+
+beforeEach(() => {
+  MockDate.set(new Date())
+})
+
+afterEach(() => {
+  MockDate.reset()
+})
+
+it('Format Month with locale function', () => {
+  for (let i = 0; i <= 7; i += 1) {
+    const dayjsAR = dayjs().locale('ar').add(i, 'day')
+    const momentAR = moment().locale('ar').add(i, 'day')
+    const testFormat1 = 'DD MMMM YYYY MMM'
+    const testFormat2 = 'MMMM'
+    const testFormat3 = 'MMM'
+    expect(dayjsAR.format(testFormat1)).toEqual(momentAR.format(testFormat1))
+    expect(dayjsAR.format(testFormat2)).toEqual(momentAR.format(testFormat2))
+    expect(dayjsAR.format(testFormat3)).toEqual(momentAR.format(testFormat3))
+  }
+})
+
+it('Preparse with locale function', () => {
+  for (let i = 0; i <= 7; i += 1) {
+    dayjs.locale('ar')
+    const momentAR = moment().locale('ar').add(i, 'day')
+    expect(dayjs(momentAR.format()).format()).toEqual(momentAR.format())
+  }
+})
+
+it('RelativeTime: Time from X gets formatted', () => {
+  const T = [
+    [44.4, 'second', 'منذ ثانية واحدة']
+  ]
+
+  T.forEach((t) => {
+    dayjs.locale('ar')
+    expect(dayjs().from(dayjs().add(t[0], t[1])))
+      .toBe(t[2])
+  })
+})
diff --git a/test/plugin/preParsePostFormat.test.js b/test/plugin/preParsePostFormat.test.js
new file mode 100755
index 000000000..685ac8d1d
--- /dev/null
+++ b/test/plugin/preParsePostFormat.test.js
@@ -0,0 +1,169 @@
+import MockDate from 'mockdate'
+// import moment from 'moment'
+import dayjs from '../../src'
+import preParsePostFormat from '../../src/plugin/preParsePostFormat'
+import localeData from '../../src/plugin/localeData'
+import duration from '../../src/plugin/duration'
+import calendar from '../../src/plugin/calendar'
+import objectSupport from '../../src/plugin/objectSupport'
+import customParseFormat from '../../src/plugin/customParseFormat'
+import relativeTime from '../../src/plugin/relativeTime'
+import utc from '../../src/plugin/utc'
+import arraySupport from '../../src/plugin/arraySupport'
+import en from '../../src/locale/en'
+
+dayjs.extend(utc)
+dayjs.extend(localeData)
+dayjs.extend(customParseFormat)
+dayjs.extend(arraySupport)
+dayjs.extend(objectSupport)
+dayjs.extend(calendar)
+dayjs.extend(duration)
+dayjs.extend(relativeTime)
+dayjs.extend(preParsePostFormat)
+
+const symbolMap = {
+  1: '!',
+  2: '@',
+  3: '#',
+  4: '$',
+  5: '%',
+  6: '^',
+  7: '&',
+  8: '*',
+  9: '(',
+  0: ')'
+}
+const numberMap = {
+  '!': '1',
+  '@': '2',
+  '#': '3',
+  $: '4',
+  '%': '5',
+  '^': '6',
+  '&': '7',
+  '*': '8',
+  '(': '9',
+  ')': '0'
+}
+
+const localeCustomizations = {
+  ...en,
+  preparse(string) {
+    if (typeof string !== 'string') {
+      // console.error('preparse - Expected string, got', {
+      //   string
+      // })
+      throw new Error(`preparse - Expected string, got ${typeof string}`)
+    }
+    try {
+      const res = string.replace(/[!@#$%^&*()]/g, match => numberMap[match])
+      // console.log('Called custom preparse', { string, res })
+      return res
+    } catch (error) {
+      const errorMsg = `Unexpected error during preparse of '${string}' - ${error}`
+      // console.error(errorMsg)
+      throw new Error(errorMsg)
+    }
+  },
+  postformat(string) {
+    if (typeof string !== 'string') {
+      // console.error('postformat - Expected string, got', {
+      //   string
+      // })
+      throw new Error(`postformat - Expected string, got ${typeof string}`)
+    }
+    try {
+      const res = string.replace(/\d/g, match => symbolMap[match])
+      // console.log('Called custom postformat', { string, res })
+      return res
+    } catch (error) {
+      const errorMsg = `Unexpected error during postFormat of '${string}' - ${error}`
+      // console.error(errorMsg)
+      throw new Error(errorMsg)
+    }
+  }
+}
+
+beforeEach(() => {
+  MockDate.set(new Date())
+  dayjs.locale('symbol', localeCustomizations)
+})
+
+afterEach(() => {
+  MockDate.reset()
+  dayjs.locale('symbol', null)
+})
+
+describe('preparse and postformat', () => {
+  describe('transform', () => {
+    const TEST_DATE = '@)!@-)*-@&'
+    const TEST_NUM = 1346025600
+    it('preparse string + format', () =>
+      expect(dayjs.utc(TEST_DATE, 'YYYY-MM-DD').unix()).toBe(TEST_NUM))
+    it('preparse ISO8601 string', () =>
+      expect(dayjs.utc(TEST_DATE).unix()).toBe(TEST_NUM))
+    it('postformat', () =>
+      expect(dayjs
+        .unix(TEST_NUM)
+        .utc()
+        .format('YYYY-MM-DD'))
+        .toBe(TEST_DATE))
+  })
+
+  describe('transform from', () => {
+    dayjs.locale('symbol', localeCustomizations)
+    const start = dayjs([2007, 1, 28])
+
+    const t1 = dayjs([2007, 1, 28]).add({ s: 90 })
+    it('postformat should work on dayjs.fn.from', () =>
+      expect(start.from(t1, true)).toBe('@ minutes'))
+
+    const t2 = dayjs().add(6, 'd')
+    it('postformat should work on dayjs.fn.fromNow', () =>
+      expect(t2.fromNow(true)).toBe('^ days'))
+
+    it('postformat should work on dayjs.duration.fn.humanize', () =>
+      expect(dayjs.duration(10, 'h').humanize()).toBe('!) hours'))
+  })
+})
+
+describe('calendar day', () => {
+  const a = dayjs()
+    .hour(12)
+    .minute(0)
+    .second(0)
+
+  it('today at the same time', () =>
+    expect(dayjs(a).calendar()).toBe('Today at !@:)) PM'))
+
+  it('Now plus 25 min', () =>
+    expect(dayjs(a)
+      .add({ m: 25 })
+      .calendar())
+      .toBe('Today at !@:@% PM'))
+
+  it('Now plus 1 hour', () =>
+    expect(dayjs(a)
+      .add({ h: 1 })
+      .calendar())
+      .toBe('Today at !:)) PM'))
+
+  it('tomorrow at the same time', () =>
+    expect(dayjs(a)
+      .add({ d: 1 })
+      .calendar())
+      .toBe('Tomorrow at !@:)) PM'))
+
+  it('Now minus 1 hour', () =>
+    expect(dayjs(a)
+      .subtract({ h: 1 })
+      .calendar())
+      .toBe('Today at !!:)) AM'))
+
+  it('yesterday at the same time', () =>
+    expect(dayjs(a)
+      .subtract({ d: 1 })
+      .calendar())
+      .toBe('Yesterday at !@:)) PM'))
+})
diff --git a/types/plugin/preParsePostFormat.d.ts b/types/plugin/preParsePostFormat.d.ts
new file mode 100644
index 000000000..30ec75e5d
--- /dev/null
+++ b/types/plugin/preParsePostFormat.d.ts
@@ -0,0 +1,4 @@
+import { PluginFunc } from 'dayjs'
+
+declare const plugin: PluginFunc
+export = plugin