SQL convert datetime and subtract hours

Question

I am trying to convert a datetime (createTime) field from its default 2012-10-06 02:29:37.243 format to am/pm so I use

convert(varchar, CreateTime, 100) as C         


        

Answer 1

For People Who wants to subtract days and hours

    declare @createTime datetime = '2012-10-06 02:29:37.243';
select @createtime as originaltime, dateadd(day, -4, dateadd(hour,-1,@createtime))as minus4daysandhour