Arduino Pro Mini Day counter (what pins do I solder???)


So I already asked about this issue earlier, but i finally cleaned up my code and got it to compile and upload to my arduino. I’m trying to make a counter that counts up the days my fiance and I have been together.
I started this based off a blog post, but the guide to diy was less than great. This is my first arduino project, so I decided to skip using a RTC for now.

Problem is, I have no idea what pins to connect between the arduino and 7-segment display. As in, where do i solder the wires?

Build of materials:
display: 7-Segment Display - 20mm (Red) - COM-11405 - SparkFun Electronics

and the code:

 #include <Time.h>
#include <TimeLib.h>
unsigned long theDateWeGotTogether = 1504539000    ;  //in unixtime
unsigned long days ; 

void setup() {                
adjustTime(1297615685); //used to try the code without knowing the right time. just paste in the unixtime you know 

void loop() 
days = ((now() - theDateWeGotTogether) / 86400); //magic nubmer 86400 is the number of seconds in a day

Any help is much apreciated, im celebrating with them today!

Use this tutorial - How to Set up Seven Segment Displays on the Arduino - Circuit Basics

Use the same pin names (though physical location are different)

Much better idea. Get a proper display module such as this:

Or this one, which is cheaper but the code is more cryptic; you need a library to control it:

Actually, looked nice so I just bought one myself!

Or maybe this one which indeed has the colon for a clock: