Sqlite sorting by date column

I am storing date in ISO8601 format example 2015-04-15T10:54:14Z in sqlite table, I want youngest date from table. below are the dates in my sqlite table

2015-04-15T10:54:14Z 
2015-04-15T10:54:115Z
2015-04-15T10:54:216Z
2015-04-15T10:54:320Z
2015-04-15T10:54:422Z

I am trying below query:

SELECT * FROM Table1 ORDER BY datetime("date_column") DESC ;

but I am not getting appropriate result.