You can customize the date for parties, events, etc. These Photoshop and Illustrator templates are ready for some cool time-traveling in the Delorean. You can download and edit from the Shop.
The LCD font that matches the BTTF movie version is included in the download.
I uploaded this digitally to this site, brought that up on my iPad 2, then made a laser-cut (Glowforge) box, painted it metal grey, distressed, printed, cut and pasted the labels, then finally added a strap to wear with my Costume.