| Year : 1933 |
|---|
| Back to standard time on Saturday 1 April 1933 - 16 h 40 (GMT - 5 h ) EST |
| Year : 1966 |
|---|
| Transition to daylight saving time on Sunday 30 October 1966 - 05 h 00 (GMT - 4 h ) EDT |
| Year : 1967 |
|---|
| Back to standard time on Thuesday 28 February 1967 - 04 h 00 (GMT - 5 h ) EST |
| Year : 1969 |
|---|
| Transition to daylight saving time on Sunday 26 October 1969 - 05 h 00 (GMT - 4 h 30) EHDT |
| Year : 1970 |
|---|
| Back to standard time on Saturday 21 February 1970 - 04 h 30 (GMT - 5 h ) EST |
| Transition to daylight saving time on Sunday 25 October 1970 - 05 h 00 (GMT - 4 h 30) EHDT |
| Year : 1971 |
|---|
| Back to standard time on Wednesday 20 January 1971 - 04 h 30 (GMT - 5 h ) EST |
| Transition to daylight saving time on Sunday 31 October 1971 - 05 h 00 (GMT - 4 h 30) EHDT |
| Year : 1972 |
|---|
| Back to standard time on Friday 21 January 1972 - 04 h 30 (GMT - 5 h ) EST |
| Transition to daylight saving time on Sunday 29 October 1972 - 05 h 00 (GMT - 4 h 30) EHDT |
| Year : 1973 |
|---|
| Back to standard time on Sunday 21 January 1973 - 04 h 30 (GMT - 5 h ) EST |
| Transition to daylight saving time on Sunday 28 October 1973 - 05 h 00 (GMT - 4 h 30) EHDT |
| Year : 1974 |
|---|
| Back to standard time on Monday 21 January 1974 - 04 h 30 (GMT - 5 h ) EST |
| Back to standard time on Sunday 27 October 1974 - 05 h 00 (GMT - 4 h ) AST |
| Year : 2000 |
|---|
| Back to standard time on Sunday 29 October 2000 - 06 h 00 (GMT - 5 h ) EST |
| Back to standard time on Sunday 3 December 2000 - 06 h 00 (GMT - 4 h ) AST |