tzdata rule group
StJohns
Historical rule context · 2 represented zones
A rule group describes recurring clock changes. It is not itself a place or an IANA time-zone identifier.
- First rule
- 1917
- Last rule
- 2011
- Rule entries
- 19
- 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.
Whitman gives 1919 Apr 5 and 1920 Apr 5; go with Shanks & Pottenger.
Where it appears
Zones using StJohns
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 |
|---|---|---|---|---|---|---|
| 1917 | only | - | Apr | 8 | 2:00 | 1:00 |
| 1917 | only | - | Sep | 17 | 2:00 | 0 |
| 1919 | only | - | May | 5 | 23:00 | 1:00 |
| 1919 | only | - | Aug | 12 | 23:00 | 0 |
| 1920 | 1935 | - | May | Sun>=1 | 23:00 | 1:00 |
| 1920 | 1935 | - | Oct | lastSun | 23:00 | 0 |
| 1936 | 1941 | - | May | Mon>=9 | 0:00 | 1:00 |
| 1936 | 1941 | - | Oct | Mon>=2 | 0:00 | 0 |
| 1946 | 1950 | - | May | Sun>=8 | 2:00 | 1:00 |
| 1946 | 1950 | - | Oct | Sun>=2 | 2:00 | 0 |
| 1951 | 1986 | - | Apr | lastSun | 2:00 | 1:00 |
| 1951 | 1959 | - | Sep | lastSun | 2:00 | 0 |
| 1960 | 1986 | - | Oct | lastSun | 2:00 | 0 |
| 1987 | only | - | Apr | Sun>=1 | 0:01 | 1:00 |
| 1987 | 2006 | - | Oct | lastSun | 0:01 | 0 |
| 1988 | only | - | Apr | Sun>=1 | 0:01 | 2:00 |
| 1989 | 2006 | - | Apr | Sun>=1 | 0:01 | 1:00 |
| 2007 | 2011 | - | Mar | Sun>=8 | 0:01 | 1:00 |
| 2007 | 2010 | - | Nov | Sun>=1 | 0:01 | 0 |