They appear to be using DateTime format.
Snippet of code that lead me to this.
toSave.EditedOn = DateTime.UtcNow;
SQLiteHelper.ExecuteNonQuery(ConnectionString, query, toSave.EmailAddress, toSave.BounceCount, toSave.BounceAddress, toSave.EditedOn.Ticks,
toSave.CreatedOn.Ticks, toSave.ID);
EditedOn = new DateTime(Convert.ToInt64(reader["EditedOn"])),
Part of the creation statement.
[CreatedOn] NUMERIC NOT NULL,
[EditedOn] NUMERIC NOT NULL
Hopefully that helps a bit. I would provide atleast a time, even if it is a min value. Since a null may cause issues, if it will even let you do it.
Matt Petty
Software Developer
SmarterTools Inc.
(877) 357-6278
www.smartertools.com