I’m not really sure why you don’t just have the field value of DistDate in the column and then set the column to be a date/time column (column properties->fourth tab-> select date/time). You can format it that way. If you absolutely need to have it be a text column for some reason use something like this:
dt1:=@Text(@Day(DistDate));
day:=@If(@Length(dt1) < 2 ; “0” + dt1 ; dt1);
@Text(@Month(DistDate))+“/”+ day +“/”+@Text(@Year(DistDate))