[Grace Themes]

Hi,

To hide the date, comments and category form blog post
Go to the Appearance -> Editor -> style.css
add below css code at the end of file

.post-date  { display:none; }
.post-comment { display:none; }
.post-categories { display:none; }

It is not possible to to change the date manually and the option is not available to change the date format.

Regards
Grace Themes