Develop

PLUGINS.md

@@ -380,6 +380,45 @@ In the first example above, if you want `parseTZ()` to parse the time as PST, yo
 date.parse('Nov 7 2021 1:59:59 -0800', 'MMM D YYYY H:mm:ss Z'); // => 2021-11-07T09:59:59Z
 ```
 
+#### Token Extension
+
+This plugin also adds tokens for time zone name to the formatter.
+
+**formatter:**
+
+| token | meaning                     | output examples       |
+|:------|:----------------------------|:----------------------|
+| z     | time zone name abbreviation | PST, EST              |
+| zz    | time zone name              | Pacific Standard Time |
+
+The `z` and `zz` are lowercase. Also, currently it does not support output other than English.
+
+**parser:**
+
+There is no change.
+
+```javascript
+const date = require('date-and-time');
+// Import "timezone" plugin.
+const timezone = require('date-and-time/plugin/timezone');
+
+// Apply "timezone" plugin to the library.
+date.plugin(timezone);
+
+const d1 = new Date(Date.UTC(2021, 2, 14, 9, 59, 59, 999));
+date.format(d1, 'MMMM DD YYYY H:mm:ss.SSS zz');
+// March 14 2021 1:59:59.999 Pacific Standard Time
+
+date.format(d1, 'MMMM DD YYYY H:mm:ss.SSS zz', true);
+// March 14 2021 9:59:59.999 Coordinated Universal Time
+
+date.formatTZ(d1, 'MMMM DD YYYY H:mm:ss.SSS z', 'Asia/Tokyo');
+// March 14 2021 18:59:59.999 JST
+
+// Transforms the date string from EST (Eastern Standard Time) to PDT (Pacific Daylight Time).
+date.transform('2021-11-07T03:59:59 UTC-0500', 'YYYY-MM-DD[T]HH:mm:ss [UTC]Z', 'MMMM D YYYY H:mm:ss z');
+// November 7 2021 1:59:59 PDT
+```
 ---
 
 ### two-digit-year

README.md

@@ -25,16 +25,16 @@ npm i date-and-time
 
 ## Recent Changes
 
+- 3.4.0
+  - Added `zz` (time zone name) and `z` (time zone name abbreviation) tokens to the `timezone` plugin.
+  - Fixed an issue where token extensions by other plugins were not reflected in functions provided by the `timezone` plugin.
+
 - 3.3.0
   - Refactored `format()`, `isValid()`, and `preparse()`, further improved performance.
 
 - 3.2.0
   - Refactored `compile()`, `format()`, and `preparse()`, slightly improved performance.
 
-- 3.1.1
-  - Fixed an issue where `format()` could output incorrect UTC times in locales with daylight savings time.
-  - Refactored `formatTZ()` of `timezone` plugin.
-
 ## Usage
 
 - ES Modules:
@@ -179,12 +179,14 @@ Available tokens and their meanings are as follows:
 
 You can also use the following tokens by importing plugins. See [PLUGINS.md](./PLUGINS.md) for details.
 
-| token | meaning                              | examples of output |
-|:------|:-------------------------------------|:-------------------|
-| DDD   | ordinal notation of date             | 1st, 2nd, 3rd      |
-| AA    | meridiem (uppercase with ellipsis)   | A.M., P.M.         |
-| a     | meridiem (lowercase)                 | am, pm             |
-| aa    | meridiem (lowercase with ellipsis)   | a.m., p.m.         |
+| token | meaning                              | examples of output    |
+|:------|:-------------------------------------|:----------------------|
+| DDD   | ordinal notation of date             | 1st, 2nd, 3rd         |
+| AA    | meridiem (uppercase with ellipsis)   | A.M., P.M.            |
+| a     | meridiem (lowercase)                 | am, pm                |
+| aa    | meridiem (lowercase with ellipsis)   | a.m., p.m.            |
+| z     | time zone name abbreviation          | PST, EST              |
+| zz    | time zone name                       | Pacific Standard Time |
 
 #### Note 1. Comments
 

date-and-time.d.ts

@@ -296,7 +296,7 @@ export type Extension = {
 export function extend(extension: Extension): void;
 
 /**  Plugin installer */
-export type Plugin = (proto: unknown, localized_proto?: unknown) => string;
+export type Plugin = (proto: unknown, date?: unknown) => string;
 
 /**
  * Importing plugins

date-and-time.js

@@ -142,7 +142,6 @@
             _formatter: _formatter,
             _parser: _parser
         },
-        localized_proto,
         date;
 
     /**
@@ -177,6 +176,7 @@
                     u.getMilliseconds = u.getUTCMilliseconds;
                     u.getDay = u.getUTCDay;
                     u.getTimezoneOffset = function () { return 0; };
+                    u.getTimezoneName = function () { return 'UTC'; };
                     return u;
                 }
                 return dateObj;
@@ -453,7 +453,6 @@
         }
     };
 
-    localized_proto = extend(proto);
     date = extend(proto);
 
     /**
@@ -474,8 +473,8 @@
         var formatter = extend(_formatter, extension.formatter, true, res);
         var parser = extend(_parser, extension.parser, true, res);
 
-        date._formatter = localized_proto._formatter = formatter;
-        date._parser = localized_proto._parser = parser;
+        date._formatter = formatter;
+        date._parser = parser;
 
         for (var plugin in plugins) {
             date.extend(plugins[plugin]);
@@ -512,7 +511,7 @@
         var install = typeof plugin === 'function' ? plugin : date.plugin[plugin];
 
         if (install) {
-            date.extend(plugins[install(proto, localized_proto)] || {});
+            date.extend(plugins[install(proto, date)] || {});
         }
     };