diff --git a/docs/en/Plugin.md b/docs/en/Plugin.md
index 4952e9cf8..75f0c7af3 100644
--- a/docs/en/Plugin.md
+++ b/docs/en/Plugin.md
@@ -234,7 +234,6 @@ dayjs('05/02/69 1:02:03 PM -05:00', 'MM/DD/YY H:mm:ss A Z')
 | `S`    | 0-9              | Hundreds of milliseconds, 1-digit |
 | `SS`   | 00-99            | Tens of milliseconds, 2-digits    |
 | `SSS`  | 000-999          | Milliseconds, 3-digits            |
-| `z`    | EST              | Time zone abbreviation            |
 | `Z`    | -5:00            | Offset from UTC                   |
 | `ZZ`   | -0500            | Compact offset from UTC, 2-digits |
 | `A`    | AM PM            | Post or ante meridiem, upper-case |
diff --git a/docs/es-es/Plugin.md b/docs/es-es/Plugin.md
index ec924f05e..daa1fb079 100644
--- a/docs/es-es/Plugin.md
+++ b/docs/es-es/Plugin.md
@@ -238,7 +238,6 @@ dayjs('2010-04-01').quarter(); // 2
 | `S`    | 0-9              | Hundreds of milliseconds, 1-digit |
 | `SS`   | 00-99            | Tens of milliseconds, 2-digits    |
 | `SSS`  | 000-999          | Milliseconds, 3-digits            |
-| `z`    | EST              | Time zone abbreviation            |
 | `Z`    | -5:00            | Offset from UTC                   |
 | `ZZ`   | -0500            | Compact offset from UTC, 2-digits |
 | `A`    | AM PM            | Post or ante meridiem, upper-case |
diff --git a/docs/ja/Plugin.md b/docs/ja/Plugin.md
index be058137e..6831a689e 100644
--- a/docs/ja/Plugin.md
+++ b/docs/ja/Plugin.md
@@ -243,7 +243,6 @@ dayjs('05/02/69 1:02:03 PM -05:00', 'MM/DD/YY H:mm:ss A Z')
 | `S`    | 0-9              | Hundreds of milliseconds, 1-digit |
 | `SS`   | 00-99            | Tens of milliseconds, 2-digits    |
 | `SSS`  | 000-999          | Milliseconds, 3-digits            |
-| `z`    | EST              | Time zone abbreviation            |
 | `Z`    | -5:00            | Offset from UTC                   |
 | `ZZ`   | -0500            | Compact offset from UTC, 2-digits |
 | `A`    | AM PM            | Post or ante meridiem, upper-case |
diff --git a/docs/ko/Plugin.md b/docs/ko/Plugin.md
index d53b85bc4..357b2be11 100644
--- a/docs/ko/Plugin.md
+++ b/docs/ko/Plugin.md
@@ -235,7 +235,6 @@ dayjs('05/02/69 1:02:03 PM -05:00', 'MM/DD/YY H:mm:ss A Z')
 | `S`    | 0-9              | Hundreds of milliseconds, 1-digit |
 | `SS`   | 00-99            | Tens of milliseconds, 2-digits    |
 | `SSS`  | 000-999          | Milliseconds, 3-digits            |
-| `z`    | EST              | Time zone abbreviation            |
 | `Z`    | -5:00            | Offset from UTC                   |
 | `ZZ`   | -0500            | Compact offset from UTC, 2-digits |
 | `A`    | AM PM            | Post or ante meridiem, upper-case |
diff --git a/docs/pt-br/Plugin.md b/docs/pt-br/Plugin.md
index e6516bc05..45fb31567 100644
--- a/docs/pt-br/Plugin.md
+++ b/docs/pt-br/Plugin.md
@@ -234,7 +234,6 @@ dayjs('05/02/69 1:02:03 PM -05:00', 'MM/DD/YY H:mm:ss A Z')
 | `S`    | 0-9              | Hundreds of milliseconds, 1-digit |
 | `SS`   | 00-99            | Tens of milliseconds, 2-digits    |
 | `SSS`  | 000-999          | Milliseconds, 3-digits            |
-| `z`    | EST              | Time zone abbreviation            |
 | `Z`    | -5:00            | Offset from UTC                   |
 | `ZZ`   | -0500            | Compact offset from UTC, 2-digits |
 | `A`    | AM PM            | Post or ante meridiem, upper-case |
diff --git a/docs/zh-cn/Plugin.md b/docs/zh-cn/Plugin.md
index 856107191..b06741025 100644
--- a/docs/zh-cn/Plugin.md
+++ b/docs/zh-cn/Plugin.md
@@ -234,7 +234,6 @@ dayjs('05/02/69 1:02:03 PM -05:00', 'MM/DD/YY H:mm:ss A Z')
 | `S`    | 0-9              | Hundreds of milliseconds, 1-digit |
 | `SS`   | 00-99            | Tens of milliseconds, 2-digits    |
 | `SSS`  | 000-999          | Milliseconds, 3-digits            |
-| `z`    | EST              | Time zone abbreviation            |
 | `Z`    | -5:00            | Offset from UTC                   |
 | `ZZ`   | -0500            | Compact offset from UTC, 2-digits |
 | `A`    | AM PM            | Post or ante meridiem, upper-case |
diff --git a/src/plugin/customParseFormat/parseFormattedInput.js b/src/plugin/customParseFormat/parseFormattedInput.js
index c3677edc7..f02588b5d 100644
--- a/src/plugin/customParseFormat/parseFormattedInput.js
+++ b/src/plugin/customParseFormat/parseFormattedInput.js
@@ -9,7 +9,6 @@ const matchUpperCaseAMPM = /[AP]M/
 const matchLowerCaseAMPM = /[ap]m/
 const matchSigned = /[+-]?\d+/ // -inf - inf
 const matchOffset = /[+-]\d\d:?\d\d/ // +00:00 -00:00 +0000 or -0000
-const matchAbbreviation = /[A-Z]{3,4}/ // CET
 
 function offsetFromString(string) {
   const parts = string.match(/([+-]|\d\d)/g)
@@ -57,10 +56,6 @@ const expressions = {
     this.year = input + (input > 68 ? 1900 : 2000)
   }],
   YYYY: [match4, addInput('year')],
-  z: [matchAbbreviation, function (input) {
-    const zone = this.zone || (this.zone = {})
-    zone.abbreviation = input
-  }],
   Z: [matchOffset, function (input) {
     const zone = this.zone || (this.zone = {})
     zone.offset = offsetFromString(input)