Date Format

On top of that, does anybody know how to remove the date completely? (Or alternatively, order posts in whichever order we want?)

Thanks,
Jamie

Line 622 to 637 in functions.php is where you find the Date function.

To modify the output of the date, find this code (line 628):

get_the_time( _x( 'M', 'post info month name', 'Serene' ) ),
				get_the_time( _x( 'd', 'post info day', 'Serene' ) ),

The first line here outputs the Month (‘M’). The second the day (‘d’) as you can see.
Let’s say we want to output the year, month and day together. Example: 2013-10-18

Replace the code above with:

get_the_time( _x( 'Y-m-d', 'post info date name', 'Serene' ) ),

Just above this code, on line 627, we will find this:

printf( '<span class="meta-post-date"><strong>%s.</strong>%s</span> <a href="%s"><div class="meta-comments-count"><span aria-hidden="true" class="icon_comment_alt"></span>%s</div></a>',

Replace that with:

printf( '<span class="meta-post-date"><strong>%s</strong></span> <a href="%s"><div class="meta-comments-count"><span aria-hidden="true" class="icon_comment_alt"></span>%s</div></a>',

You may want to modify the CSS of the date output to make it fit/look better in the box.

In style.css line 299 to 305 find this:

.meta-date-wrap {
	width: 165px;
	height: 55px;
	display: inline-block;
	position: relative;
	-webkit-perspective: 600px;
}

Change to something like this:

.meta-date-wrap {
	width: 15%;
	height: 55px;
	display: inline-block;
	position: relative;
	-webkit-perspective: 600px;
}

Here is a Pastebin link with everything wrapped up (just the functions.php part):
https://pastebin.com/P1CTGkL5

To use your own formatting of the date, see the codex: https://codex.www.ads-software.com/Formatting_Date_and_Time

Also. Best practice, and also more convenient is to use a child theme for modifications. But that is a different topic. More about this here: https://codex.www.ads-software.com/Child_Themes
Good luck!
/ Christopher

@ Christopher Anderton: Thank you so much – worked great for me!