In order to remove date from blog posts and posts block, Please enter below css in wp-admin/appearance/customise/additionalCSS box.
On blog page.
To remove full block that displays date/author/categories.
.blog_area .blog_inner .blog_lift_sidebar .blog_items .breadcrumb_date {
display: none;
}
To remove only date
.blog_area .blog_inner .blog_lift_sidebar .blog_items .breadcrumb_date h6 {
display: none;
}
On single post page.
If you want to remove full block showing date and author info.
.breadcrumb_date h6{ display: none;}
If you want to remove only date.
.breadcrumb_date h6{ display: none;}
Remove date from other areas.
.recent_inner h6,
.line_news h4{ display: none;}