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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 | 
|---|---|
| 1417 |  * | 
| 1418 |  * @param string $d Optional. PHP date format. Defaults to the "date_format" option | 
| 1419 |  * @return string | 
| 1420 |  */ | 
| 1421 | function get_the_modified_date($d = '') { | 
| 1422 |      if ( '' == $d ) | 
| 1423 |           $the_time = get_post_modified_time(get_option('date_format'), null, null, true); | 
| 1424 |      else | 
| 1425 |           $the_time = get_post_modified_time($d, null, null, true); | 
| 1426 |      return apply_filters('get_the_modified_date', $the_time, $d); | 
| 1427 | } | 
| 1428 |  | 
| 1429 | /** | 
| 1430 |  * Display the time at which the post was written. | 
| 1431 |  * | 
| 1432 |  * @since 0.71 | 
| 1433 |  * | 
| 1434 |  * @param string $d Either 'G', 'U', or php date format. | 
| 1435 |  */ |