1989/1/1: 111989 = 111:989 = each is palindrome
1989/1/2: 121989 = 121:989 = each is palindrome
1989/1/3: 131989 = 131:989 = each is palindrome
1989/1/4: 141989 = 141:989 = each is palindrome
1989/1/5: 151989 = 151:989 = each is palindrome
1989/1/6: 161989 = 161:989 = each is palindrome
1989/1/7: 171989 = 171:989 = each is palindrome
1989/1/8: 181989 = 181:989 = each is palindrome
1989/1/9: 010989 = 010:989 = each is palindrome
1989/1/9: 191989 = 191:989 = each is palindrome
1989/1/17: 01171989 = 0117:1989 = integer ratio of 1 to 17
1989/1/17: 19890117 = 1989:0117 = integer ratio of 17 to 1
1989/2/1: 121989 = 121:989 = each is palindrome
1989/2/9: 020989 = 020:989 = each is palindrome
1989/2/11: 021189 = 021:189 = integer ratio of 1 to 9
1989/2/21: 02211989 = 0221:1989 = integer ratio of 1 to 9
1989/2/21: 19890221 = 1989:0221 = integer ratio of 9 to 1
1989/3/1: 131989 = 131:989 = each is palindrome
1989/3/9: 030989 = 030:989 = each is palindrome
1989/3/15: 031589 = 031:589 = integer ratio of 1 to 19
1989/4/1: 141989 = 141:989 = each is palindrome
1989/4/9: 040989 = 040:989 = each is palindrome
1989/5/1: 151989 = 151:989 = each is palindrome
1989/5/9: 050989 = 050:989 = each is palindrome
1989/6/1: 161989 = 161:989 = each is palindrome
1989/6/7: 6789 = 6:7:8:9 = arthimetic series of increment 1
1989/6/9: 060989 = 060:989 = each is palindrome
1989/7/1: 171989 = 171:989 = each is palindrome
1989/7/6: 6789 = 6:7:8:9 = arthimetic series of increment 1
1989/7/9: 070989 = 070:989 = each is palindrome
1989/8/1: 181989 = 181:989 = each is palindrome
1989/8/9: 080989 = 080:989 = each is palindrome
1989/8/9: 8989 = cyclic permutation symmetric
1989/8/9: 9889 = palindrome
1989/9/1: 010989 = 010:989 = each is palindrome
1989/9/1: 191989 = 191:989 = each is palindrome
1989/9/2: 020989 = 020:989 = each is palindrome
1989/9/3: 030989 = 030:989 = each is palindrome
1989/9/4: 040989 = 040:989 = each is palindrome
1989/9/5: 050989 = 050:989 = each is palindrome
1989/9/6: 060989 = 060:989 = each is palindrome
1989/9/7: 070989 = 070:989 = each is palindrome
1989/9/8: 080989 = 080:989 = each is palindrome
1989/9/8: 89098 = palindrome
1989/9/8: 8989 = cyclic permutation symmetric
1989/9/8: 8998 = palindrome
1989/9/8: 9889 = palindrome
1989/9/9: 090989 = 090:989 = each is palindrome
1989/10/1: 891001 = 891:001 = integer ratio of 891 to 1
1989/10/3: 891003 = 891:003 = integer ratio of 297 to 1
1989/10/9: 891009 = 891:009 = integer ratio of 99 to 1
1989/10/11: 891011 = 891:011 = integer ratio of 81 to 1
1989/10/19: 101989 = 101:989 = each is palindrome
1989/10/27: 891027 = 891:027 = integer ratio of 33 to 1
1989/11/2: 021189 = 021:189 = integer ratio of 1 to 9
1989/11/19: 111989 = 111:989 = each is palindrome
1989/12/19: 121989 = 121:989 = each is palindrome