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| YEAR | DATE | EVENT | PRIME MINISTER |
| 1945 | 3 april | Union to Boemia into Czechslovakia | |
| 1969 | 1 january | Socialist Republic of Czechslovakia Federation | Stefan Sádovský |
| 1969 | 4 may | Peter Clotka | |
| 1988 | 12 october | Ivan Knotek | |
| 1989 | 22 june | Pavel Hrivnák | |
| 1989 | 8 december | Milan Cic | |
| 1990 | 23 march | Republic | Milan Cic |
| 1990 | 27 june | Vladimír Meciar (I) | |
| 1991 | 23 april | Ján Carnogurský | |
| 1992 | 24 june | Vladimír Meciar (II) |