Hello Thomas,
You need to add CSS code into X > Theme Options > CSS to hide the dates in the blog index. You need to use the Google Chrome Developer Toolbar to check the live HTML code and find which CSS selector you need to use.
By default, the body of the page for the blog index and archive pages uses blog and archive CSS class. The post meta is using .p-meta>span for each meta. Using the nth-child class selector, we can target the second meta by using; .p-meta>span:nth-child(2). Therefore the CSS code can be like this:
.blog .p-meta>span:nth-child(n),
.archive .p-meta>span:nth-child(n) {
display: none;
}
where n is equals to 2. This is to hide the second post meta element only for the blog index and archive pages.
Note: This code will not work. It serves as an example only. Change the “n” in the code to 2 to make it work.
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Best Regards.