Check out eclipsecountdown.com to give you stats on the upcoming eclipse based on your GPS location, created by Rick Brown. You can display the local details of the Aug. 21 eclipse wherever you are. It accesses the GPS on your mobile device, figures out all the relevant info, and displays a countdown timer for the next "milestone" of the eclipse (how long till the eclipse starts, then how long till totality begins, etc.).
There's nothing to download, just point your phone's browser to: eclipsecountdown.com
If it doesn't work (or if it asks you to enter your location manually), make sure you've enabled "Location Services" on your device and/or your browser app. This works differently with different devices and apps. Enjoy!
Hat tip: NebraskaMATH friend Josh Brown Kramer