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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 | 
|---|---|
| 457 |  | 
| 458 |                     $this->blogs[$importing_blog]['comments_start_index'] = (int) $q['start-index']; | 
| 459 |                     $this->save_vars(); | 
| 460 |                } while ( !empty( $query ) && $this->have_time() ); | 
| 461 |           } | 
| 462 |           $this->blogs[$importing_blog]['mode'] = 'authors'; | 
| 463 |           $this->save_vars(); | 
| 464 |           if ( !$this->blogs[$importing_blog]['posts_done'] && !$this->blogs[$importing_blog]['comments_done'] ) | 
| 465 |                die('nothing'); | 
| 466 |           do_action('import_done', 'blogger'); | 
| 467 |           die('done'); | 
| 468 |      } | 
| 469 |  | 
| 470 |      function convert_date( $date ) { | 
| 471 |          preg_match('#([0-9]{4})-([0-9]{2})-([0-9]{2})T([0-9]{2}):([0-9]{2}):([0-9]{2})(?:\.[0-9]+)?(Z|[\+|\-][0-9]{2,4}){0,1}#', $date, $date_bits); | 
| 472 |          $offset = iso8601_timezone_to_offset( $date_bits[7] ); | 
| 473 |           $timestamp = gmmktime($date_bits[4], $date_bits[5], $date_bits[6], $date_bits[2], $date_bits[3], $date_bits[1]); | 
| 474 |           $timestamp -= $offset; // Convert from Blogger local time to GMT | 
| 475 |           $timestamp += get_option('gmt_offset') * 3600; // Convert from GMT to WP local time |