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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code | 
|---|---|
| 140 |       * Filters the date formatted based on the locale. | 
| 141 |       * | 
| 142 |       * @since 2.8.0 | 
| 143 |       * | 
| 144 |       * @param string $j          Formatted date string. | 
| 145 |       * @param string $req_format Format to display the date. | 
| 146 |       * @param int    $i          Unix timestamp. | 
| 147 |       * @param bool   $gmt        Whether to convert to GMT for time. Default false. | 
| 148 |       */ | 
| 149 |      $j = apply_filters( 'date_i18n', $j, $req_format, $i, $gmt ); | 
| 150 |      return $j; | 
| 151 | } | 
| 152 |  | 
| 153 | /** | 
| 154 |  * Determines if the date should be declined. | 
| 155 |  * | 
| 156 |  * If the locale specifies that month names require a genitive case in certain | 
| 157 |  * formats (like 'j F Y'), the month name will be replaced with a correct form. | 
| 158 |  * |