Conversion failed when converting date and/or time from character string while inserting datetime

Question

I was trying to create a table as follows,

create table table1(date1 datetime,date2 datetime);

First I tried inserting values as below,

Answer 1

convert(datetime2,((SUBSTRING( ISNULL(S2.FechaReal,e.ETA),7,4)+'-'+ SUBSTRING( ISNULL(S2.FechaReal,e.ETA),4,2)+'-'+ SUBSTRING( ISNULL(S2.FechaReal,e.ETA),1,2) + ' 12:00:00.127')))  as fecha,