You probably need to format your integers as two characters (month, day, hour, minute, second) or four characters (year).
Try one of these:
ToDate(Substring(Concat("0", ToString({Int1})), If({Int1}<9, 0, 1)) + "-" + Substring(Concat("0", ToString({Int2})), If({Int2}<9, 0, 1)) + "-" + Substring(Concat("000", ToString({Int3})), Len(ToString({Int3})) - 1) + " " + Substring(Concat("0", ToString({Int4})), If({Int4}<9, 0, 1)) + ":" + Substring(Concat("0", ToString({Int5})), If({Int5}<9, 0, 1)) + ":" + Substring(Concat("0", ToString({Int6})), If({Int6}<9, 0, 1)))or
ToDate(Substring(Concat("0", ToString({Int1})), Len(ToString({Int1})) - 1) + "-" + Substring(Concat("0", ToString({Int2})), Len(ToString({Int2})) - 1) + "-" + Substring(Concat("000", ToString({Int3})), Len(ToString({Int3})) - 1) + " " + Substring(Concat("0", ToString({Int4})), Len(ToString({Int4})) - 1) + ":" + Substring(Concat("0", ToString({Int5})), Len(ToString({Int5})) - 1) + ":" + Substring(Concat("0", ToString({Int6})), Len(ToString({Int6})) - 1))These assume the year (i.e., {Int3}) is 2009 or similar value instead of 9 or similar value.
I know this is a lot more complicated but it should work.