date.php

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<?php
/**
 * Display the Date field type
 *
 * @package GravityView
 * @subpackage GravityView/templates/fields
 */

$gravityview_view = GravityView_View::getInstance();

extract( $gravityview_view->getCurrentField() );

/**
 * Unix Epoch probably isn't what you're looking for.
 * @since 1.7
 */
if( $value === '1970-01-01' ) {

 /**
 * @filter `gravityview/fields/date/hide_epoch` Whether to hide `1970-01-01` dates; that is normally an erroneous date. Return false to show value. Use `__return_false` callback.
 * @param bool $hide_epoch True: hide values that are 1970-01-01. False: show the value.
 */
 $hide_epoch = apply_filters( 'gravityview/fields/date/hide_epoch', true );

 if( $hide_epoch ) {
 return;
 }
}

if( !empty( $field_settings ) && !empty( $field_settings['date_display'] ) && !empty( $value )) {

 // If there is a custom PHP date format passed via the date_display setting,
 // use PHP's date format
 $format = $field_settings['date_display'];
 $output = date_i18n( $format, strtotime( $value ) );

} else {

 $output = GravityView_Field_Date::date_display( $value, \GV\Utils::get( $field, "dateFormat" ), $field_id );

}

echo $output;