Pattern field of Date and Enabling Condition

Syntax
#1

Dear Team,

i have a Date Field which i have made like that Pattern ##/##/####

  1. C34_DATE ##/##/####
  2. C35 IS A integer Field

if in c43 i have put any date then not aske c35 and if in c34 i have put 00/00/00 then should be ask c35.

so how can write a condition for this situation

#2

And if you enter 88/88/8888? or 99/99/9999? or 67/78/8998?

Instead ask “Do you know your date of birth? Y/N”
If yes, tell me dob C34,
otherwise tell me age/year of birth C35.

Best, Sergiy