| 19990909 | 19990910 | |
| 19991231 | 20000101 | 12/31/99-1/1/00 |
| 20000228 | 20000229 | leap year |
| 20000229 | 20000301 | leap year |
| 20001231 | 20010101 | 12/31/00-1/1/1 |
| 20000110 20001010 |
seven numerals eight numerals |
1/10/2000 10/10/2000 |
| 20000908 | Unix problem |