tzdata rule group
Eire
Active or recent rule group · 1 represented zone
A rule group describes recurring clock changes. It is not itself a place or an IANA time-zone identifier.
- First rule
- 1971
- Last rule
- 2026 or later
- Rule entries
- 7
- Source files
- europe
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.
In January 2018 we discovered that the negative SAVE values in the Eire rules cause problems with tests for ICU: and with tests for OpenJDK: To work around this problem, the build procedure can translate the following data into two forms, one with negative SAVE values and the other form with a traditional approximation for Irish timestamps after 1971-10-31 02:00 UTC; although this approximation has tm_isdst flags that are reversed, its UTC offsets are correct and this often suffices.... The following is like GB-Eire and EU, except with standard time in summer and negative daylight saving time in winter. It is for when negative SAVE values are used.
Where it appears
Zones using Eire
Only historically distinct canonical zones from this atlas are listed.
IrelandOriginal rule fields
Recorded rule entries
Structured directly from tzdata’s Rule lines.
| From | To | Type | In | On | At | Save |
|---|---|---|---|---|---|---|
| 1971 | only | - | Oct | 31 | 2:00u | -1:00 |
| 1972 | 1980 | - | Mar | Sun>=16 | 2:00u | 0 |
| 1972 | 1980 | - | Oct | Sun>=23 | 2:00u | -1:00 |
| 1981 | max | - | Mar | lastSun | 1:00u | 0 |
| 1981 | 1989 | - | Oct | Sun>=23 | 1:00u | -1:00 |
| 1990 | 1995 | - | Oct | Sun>=22 | 1:00u | -1:00 |
| 1996 | max | - | Oct | lastSun | 1:00u | -1:00 |