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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 | 
|---|---|
| 1500 | function get_post_time( $d = 'U', $gmt = false, $post = null, $translate = false ) { // returns timestamp | 
| 1501 |      $post = get_post($post); | 
| 1502 |  | 
| 1503 |      if ( $gmt ) | 
| 1504 |           $time = $post->post_date_gmt; | 
| 1505 |      else | 
| 1506 |           $time = $post->post_date; | 
| 1507 |  | 
| 1508 |      $time = mysql2date($d, $time, $translate); | 
| 1509 |      return apply_filters('get_post_time', $time, $d, $gmt); | 
| 1510 | } | 
| 1511 |  | 
| 1512 | /** | 
| 1513 |  * Display the time at which the post was last modified. | 
| 1514 |  * | 
| 1515 |  * @since 2.0.0 | 
| 1516 |  * | 
| 1517 |  * @param string $d Optional Either 'G', 'U', or php date format defaults to the value specified in the time_format option. | 
| 1518 |  */ |