Hi George,
Unfortunately the only way is manually entering the date every time. However, there is a slight work around using Google Drive.
Initially you'll need three fields set-up:
- Current Date (date), Prescription Filled (date) & Days Difference (calculation)
For days you'll need to calculate a date formula which is: datediff(#{Current Date},#{Prescription Filled})
"Current Date" & Prescription Filled are the names of your fields which you can decide yourself, also Memento had a built in field picker making it even easier.
Now...
Sync your document with Google Drive
Within the Google Sheets - change the Current Date to: =today() (this should continue to populate your library with current date after sync - Google Drive login may be required)
Copy for the remaining rows & re-sync back to Memento