A quick way to "hide" the date for reviews would be to create a new .scss.liquid file under Assets, example review-hide-date.scss.liquid.
Paste the follow code into review-hide-date.scss.liquid (Save):
//start of hide date code
.spr-review-header-byline {
color:#878A69; //<-- insert color of #shopify-product-reviews element
font-size:1px !important;
strong {
font-size:13px;
color:#FFF; //<--insert color of text for review Author
}
strong:nth-child(2) {
display:none;
}
}
//end of code
In your theme file you can load the scss for your "product" tempate.
{% if template == 'product' %}
{{ 'review-hide-date.scss.css' | asset_url | stylesheet_tag }}
{% endif %}