To reset Day One Mac 2.0’s password, do the following:

  1. Open Keychain Access.
  2. Search for Day One App Locking Password.
  3. Control click Day One App Locking Password to reveal a contextual menu.
  4. Select Delete “Day One App Locking Password”.
  5. Return to Day One to open it without your previously-set password.

Keychain Access can be found by searching Spotlight or going to Finder > Applications > Utilities > Keychain Access. 

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