tzdata rule group
CR
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
- 1979
- Last rule
- 1992
- Rule entries
- 5
- 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.
The tzdata source notes: 00; go with Shanks & Pottenger.
Where it appears
Zones using CR
Only historically distinct canonical zones from this atlas are listed.
Costa RicaOriginal rule fields
Recorded rule entries
Structured directly from tzdata’s Rule lines.
| From | To | Type | In | On | At | Save |
|---|---|---|---|---|---|---|
| 1979 | 1980 | - | Feb | lastSun | 0:00 | 1:00 |
| 1979 | 1980 | - | Jun | Sun>=1 | 0:00 | 0 |
| 1991 | 1992 | - | Jan | Sat>=15 | 0:00 | 1:00 |
| 1991 | only | - | Jul | 1 | 0:00 | 0 |
| 1992 | only | - | Mar | 15 | 0:00 | 0 |