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The pen keeps its settings in a small text file called MRECSET.txt. You see it when the pen is plugged into a computer, next to your recordings. Most people only need to touch it once, to set the clock.
1

Plug the pen into a computer

Open it like a USB drive and find MRECSET.txt.
2

Open the file in a text editor

TextEdit on a Mac or Notepad on Windows works.
3

Change the line you need

Only change the value. Keep the same format that is already in the file.
4

Save, then unplug the pen safely

Eject the drive before you unplug it, so the change is saved.

The settings

Write the new time in exactly the same layout as the TIME line already shows. If the pen doesn’t pick up the change, write to hello@tryjunoapp.com and we’ll help.
A wrong clock doesn’t break anything. Juno still transcribes the recording. It may just show up with the wrong date, under Just added.