How to order by Publishing date?

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How should I display the content by publishing date, starting from the oldest to newest.

`<?php`

`// Define our WP Query Parameters`

`$args = array( ‘post_type’ => ‘Plan’, ‘posts_per_page’ => 6 );`

`$loop = new WP_Query( $args );`

`while ( $loop->have_posts() ) : $loop->the_post();`

`?>`

&#x200B;

`<div class=”postBlog”>`

`<a href=”<?php the\_permalink() ?>” class=”simpleText”><?php the\_title(); ?></a>`

`<p class=”text-gray-600 mt-1″><span class=”font-bold text-black text-3xl”>`

`<?php echo get\_field(‘pricing’);`
`?>`

`</p>`

`<p class=”text-gray-600 mt-2″>`

`<?php $content = get\_the\_content(); echo wp\_trim\_words( get\_the\_content(), 25, ‘…’ );?>`

`</p>`

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