You can reset an addiction's Sober Time. This will set its clean date and time to the current date and time, creating a new entry in that addiction's history page. Resetting an addiction is mostly used for when you've relapsed.
1. On the Home page, expand the addiction's bottom menu.
2. Tap Reset.
3. Tap the dialog's Reset button.
Note: You can manually undo this by deleting the history entry and setting your addiction's clean date and time to the original values.