Crystal reports formula field not displaying if previous record field is same -

i new cystal reports.

i have formula field converts number date.

the formula field not display if previous record has same value.

any idea missing?

thanks

8-digit numeric format yyyymmdd datevalue

whileprintingrecords;

numbervar input := {table.startdate}; // or whatever field name is

// line checks minimum value, value work.

if input < 19590101 date (1959, 01, 01) else

date ( val (totext (input, 0 , "") [1 4]),

val (totext (input, 0 , "") [5 6]),

val (totext (input, 0 , "") [7 8]) )