How do I change the 24 hour format in appointments?

[UndergroundArtM]

Hey! 
So, when I look at our booking site for Classes on a laptop or pad all is well, but when folks book through Instagram the appointment times are set up in 24 hour format. That’s not a big deal for a lot of people, but it is pretty confusing for our younger clients. We want to make it as easy as possible for people to book. Is there a way to change this format? 

Unfortunately, because Square doesn’t allow you to set aside specific times for specific services, we’ve had to find a workaround by creating Classes instead. It works, but it’s clunky. Again, the 24 hour time format only seems to be happening with Classes. 

Please help!