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| YEAR | DATE | EVENT | HEAD OF STATE | PRIME MINISTER |
| 1959 | 3 june | Independent State | Sir William Allmond Codrington Goode | Lee Kuan Yew |
| 1959 | 1 december | Yusuf bin Ishak | ||
| 1963 | 18 september | State of Malaysia Federation | Yusuf bin Ishak | Lee Kuan Yew |
| 1965 | 9 august | Independent into Commonwealth | Yusuf bin Ishak | Lee Kuan Yew |
| 1965 | 22 december | Republic | Yusuf bin Ishak | Lee Kuan Yew |
| 1970 | 23 november | Yeoh Ghim Seng (I) | ||
| 1971 | 2 january | Benjamin Henry Sheares | ||
| 1981 | 2 may | Yeoh Ghim Seng (II) | ||
| 1981 | 24 october | Chengara Veetil Devan Nair | ||
| 1985 | 27 march | Wee Chong Jin | ||
| 1985 | 29 march | Yeoh Ghim Seng (III) | ||
| 1985 | 3 september | Wee Kim Wee | ||
| 1990 | 28 november | Goh Chok Tong | ||
| 1993 | 1 september | Ong Teng Cheong | ||
| 1999 | 1 september | Sellapan Rama Nathan | ||
| 2004 | 12 august | Lee Hsien Loong | ||
| 2011 | 1 september | Tony Tan | ||
| 2017 | 14 september | Halimah Yacob | ||
| 2023 | 14 september | Tharman Shanmugaratnam | ||
| 2024 | 15 may | Lawrence Wong |