Sanitize a custom date meta field

I assume you’re missing the value="", it seems like you use <input> as a regular HTML tag, and not a self-closing one.

A basic example of what it should be like if I only use your value and ignore all the other attributes.

<input value="<?php echo esc_attr( get_the_author_meta( 'periodo_1da', $user->ID ) ); ?>">

And here is the input tag with all the attributes and the correct value attribute.

<input type="date" id="periodo_1da" name="periodo_1da" class="list_prezzi" value="<?php echo esc_attr( get_the_author_meta( 'periodo_1da', $user->ID ) ); ?>">

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