tzdata rule group
Toronto
Historical rule context · 1 represented zone
A rule group describes recurring clock changes. It is not itself a place or an IANA time-zone identifier.
- First rule
- 1919
- Last rule
- 1973
- Rule entries
- 18
- Source files
- northamerica
Notes from the time database
Context for this rule
These source notes are preserved from tzdata. They help explain a rule’s period, without adding claims beyond the source.
Shanks & Pottenger say 1923-09-19; assume it's a typo and that "-16" was meant.
Where it appears
Zones using Toronto
Only historically distinct canonical zones from this atlas are listed.
CanadaOriginal rule fields
Recorded rule entries
Structured directly from tzdata’s Rule lines.
| From | To | Type | In | On | At | Save |
|---|---|---|---|---|---|---|
| 1919 | only | - | Mar | 30 | 23:30 | 1:00 |
| 1919 | only | - | Oct | 26 | 0:00 | 0 |
| 1920 | only | - | May | 2 | 2:00 | 1:00 |
| 1920 | only | - | Sep | 26 | 0:00 | 0 |
| 1921 | only | - | May | 15 | 2:00 | 1:00 |
| 1921 | only | - | Sep | 15 | 2:00 | 0 |
| 1922 | 1923 | - | May | Sun>=8 | 2:00 | 1:00 |
| 1922 | 1926 | - | Sep | Sun>=15 | 2:00 | 0 |
| 1924 | 1927 | - | May | Sun>=1 | 2:00 | 1:00 |
| 1927 | 1937 | - | Sep | Sun>=25 | 2:00 | 0 |
| 1928 | 1937 | - | Apr | Sun>=25 | 2:00 | 1:00 |
| 1938 | 1940 | - | Apr | lastSun | 2:00 | 1:00 |
| 1938 | 1939 | - | Sep | lastSun | 2:00 | 0 |
| 1945 | 1948 | - | Sep | lastSun | 2:00 | 0 |
| 1946 | 1973 | - | Apr | lastSun | 2:00 | 1:00 |
| 1949 | 1950 | - | Nov | lastSun | 2:00 | 0 |
| 1951 | 1956 | - | Sep | lastSun | 2:00 | 0 |
| 1957 | 1973 | - | Oct | lastSun | 2:00 | 0 |