diff --git a/src/plugin/timezone/index.js b/src/plugin/timezone/index.js
index 06dd27c1f..593a3a6eb 100644
--- a/src/plugin/timezone/index.js
+++ b/src/plugin/timezone/index.js
@@ -114,14 +114,16 @@ export default (o, c, d) => {
     return result && result.value
   }
 
-  d.tz = function (input, timezone = defaultTimezone) {
+  d.tz = function (input, arg1, arg2) {
+    const parseFormat = arg2 && arg1
+    const timezone = arg2 || arg1 || defaultTimezone
     const previousOffset = tzOffset(+d(), timezone)
     let localTs
     if (typeof input !== 'string') {
       // timestamp number || js Date || Day.js
       localTs = d(input) + (previousOffset * 60 * 1000)
     }
-    localTs = localTs || d.utc(input).valueOf()
+    localTs = localTs || d.utc(input, parseFormat).valueOf()
     const [targetTs, targetOffset] = fixOffset(localTs, previousOffset, timezone)
     const ins = d(targetTs).utcOffset(targetOffset)
     ins.$x.$timezone = timezone
diff --git a/test/plugin/timezone.test.js b/test/plugin/timezone.test.js
index 1f733baf6..59eb83111 100644
--- a/test/plugin/timezone.test.js
+++ b/test/plugin/timezone.test.js
@@ -2,10 +2,12 @@ import MockDate from 'mockdate'
 import moment from 'moment-timezone'
 import dayjs from '../../src'
 import timezone from '../../src/plugin/timezone'
+import customParseFormat from '../../src/plugin/customParseFormat'
 import utc from '../../src/plugin/utc'
 
 dayjs.extend(utc)
 dayjs.extend(timezone)
+dayjs.extend(customParseFormat)
 
 beforeEach(() => {
   MockDate.set(new Date())
@@ -17,6 +19,7 @@ afterEach(() => {
 
 const NY = 'America/New_York'
 const VAN = 'America/Vancouver'
+const DEN = 'America/Denver'
 const TOKYO = 'Asia/Tokyo'
 
 describe('Guess', () => {
@@ -281,3 +284,13 @@ describe('Get offsetName', () => {
     expect(d).toBe('Eastern Standard Time')
   })
 })
+
+describe('CustomPraseFormat', () => {
+  const result = 1602786600
+  it('normal', () => {
+    expect(dayjs.tz('2020/10/15 12:30', DEN).unix()).toBe(result)
+  })
+  it('custom', () => {
+    expect(dayjs.tz('10/15/2020 12:30', 'MM/DD/YYYY HH:mm', DEN).unix()).toBe(result)
+  })
+})
diff --git a/types/plugin/timezone.d.ts b/types/plugin/timezone.d.ts
index 491f87465..f356a8788 100644
--- a/types/plugin/timezone.d.ts
+++ b/types/plugin/timezone.d.ts
@@ -10,6 +10,7 @@ declare module 'dayjs' {
 
   interface DayjsTimezone {
     (date: ConfigType, timezone?: string): Dayjs
+    (date: ConfigType, format: string, timezone?: string): Dayjs
     guess(): string
     setDefault(timezone?: string): void
   }