wp-includes/customize/class-wp-customize-date-time-control.php:306Format GMT Offset.
$offsetfloatstring public function format_gmt_offset( $offset ) { if ( 0 <= $offset ) { $formatted_offset = '+' . (string) $offset; } else { $formatted_offset = (string) $offset; } $formatted_offset = str_replace( array( '.25', '.5', '.75' ), array( ':15', ':30', ':45' ), $formatted_offset ); return $formatted_offset; }Introduced in 4.9.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/customize/class-wp-customize-date-time-control.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.