Last modified date of database in SQL Server

DECLARE @sqlString NVARCHAR(max)
DECLARE @union NVARCHAR(max)
SET @sqlString = ''
SET @union = ''
DECLARE @name nvarchar(50);

DECLARE crs CURSOR FOR
SELECT Name FROM sys.databases WHERE  state = 0
OPEN crs
FETCH NEXT FROM crs INTO @name

WHILE @@FETCH_STATUS = 0
BEGIN
   SET @sqlString = @sqlString + @union
   SET @sqlString = @sqlString + '
    SELECT
    TOP 1
  ''' + @name + ''' as DBName, modify_date
  FROM
   [' + @name + '].sys.tables'

 SET @union = ' UNION '

    FETCH NEXT FROM crs INTO @name
END

SET @sqlString = @sqlString + ' ORDER BY DBName ASC'
CLOSE crs;
DEALLOCATE crs;
EXEC(@sqlString)