For QDV7 use, the dates from SQL databases are stored as float numbers, but in a different date format than in SQLite (file) databases.
To convert these numbers to dates outside of QDV7, use:
select Reference,
convert(datetime, AlterDate) as AlterDate, convert(datetime, ArticleDate) as ArticleDate
from Articles
To correct invalid number (date), update them using the Articles Converter or use the following SQL statement:
update Articles set
ArticleDate = convert(float, convert(datetime, '2013-01-01T00:00:00')),
AlterDate = convert(float, convert(datetime, '2013-11-01T00:00:00'))
or to current date time:
update Articles set
ArticleDate = convert(float, getdate()),
AlterDate = convert(float, getdate())