Can I access my Timebox if I am not connected to the Internet?

Yes, you always have a complete copy of your Timebox on your own iOS device, so a connection to the Internet is not required to access your information. 

How do I get rid of the hyphen in my date?

You can get rid of the hyphen by making the To date the same as the From date. 

How do I change the format of my dates? 

From the Settings App built into iOS, tap General then International and then Region Format

How do I remove the date from a photo?

Tap the date in the right-hand corner of the photo, swipe the date button and tap Done. Set Date will go away when you tap Done in your story.