Difference between 2 dates in SQLite

 SELECT julianday('now') - julianday(DateCreated) FROM Payment;

Difference In Days

Select Cast ((
    JulianDay(ToDate) - JulianDay(FromDate)
) As Integer)

Difference In Hours

Select Cast ((
    JulianDay(ToDate) - JulianDay(FromDate)
) * 24 As Integer)

Difference In Minutes

Select Cast ((
    JulianDay(ToDate) - JulianDay(FromDate)
) * 24 * 60 As Integer)

Difference In Seconds

Select Cast ((
    JulianDay(ToDate) - JulianDay(FromDate)
) * 24 * 60 * 60 As Integer)

Both answers provide solutions a bit more complex, as they need to be. Say the payment was created on January 6, 2013. And we want to know the difference between this date and today.

sqlite> SELECT julianday() - julianday('2013-01-06');
34.7978485878557 

The difference is 34 days. We can use julianday('now') for better clarity. In other words, we do not need to put date() or datetime() functions as parameters to julianday() function.

The SQLite documentation is a great reference and the DateAndTimeFunctions page is a good one to bookmark.

It's also helpful to remember that it's pretty easy to play with queries with the sqlite command line utility:

sqlite> select julianday(datetime('now'));
2454788.09219907
sqlite> select datetime(julianday(datetime('now')));
2008-11-17 14:13:55