View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0001030 | 1003.1(2013)/Issue7+TC1 | Base Definitions and Headers | public | 2016-03-03 20:32 | 2024-06-11 08:57 |
| Reporter | Guy Harris | Assigned To | |||
| Priority | normal | Severity | Editorial | Type | Clarification Requested |
| Status | Closed | Resolution | Accepted As Marked | ||
| Name | Guy Harris | ||||
| Organization | |||||
| User Reference | |||||
| Section | Environment Variables (section 8) | ||||
| Page Number | 179-180 | ||||
| Line Number | 5756-5816 | ||||
| Interp Status | Approved | ||||
| Final Accepted Text | see 0001030:0003511 | ||||
| Summary | 0001030: The Single UNIX Specification says nothing about TZ environment variable settings without alternative time start or end | ||||
| Description | The specification for the TZ environment variable allows the "rule" portion to be omitted; however, it doesn't indicate when changes to or from alternative time take place if the "rule" portion is omitted. | ||||
| Desired Action | Have the specification either: 1) explicitly indicate that the dates and times of the transitions to and from alternative time are undefined if the "rule" portion is omitted; 2) explicitly indicate that the dates and times of the transitions to and from alternative time are implementation-defined if the "rule" portion is omitted; 3) explicitly indicate what transition dates and times are used if the "rule" portion is omitted. | ||||
| Tags | tc3-2008 | ||||
| related to | 0001253 | Closed | 1003.1(2016/18)/Issue7+TC2 | clarify that "alternative time" means tm_isdst is positive |
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Interpretation response ------------------------ The standard does not speak to this issue, and as such no conformance distinction can be made between alternative implementations based on this. This is being referred to the sponsor. Rationale: ------------- If the "rule" field is not included in TZ, implementations are required to determine when the switches between standard and alternative time happen but were not required to document when the transitions occur. Applications would benefit from knowing when those transitions occur. Specifying the transition times in the standard is not believed to be practical due to the continual changes to time zones by legislative bodies and the potential differences in existing implementations. Notes to the Editor (not part of this interpretation): ------------------------------------------------------- On page 180 after line 5947 (XBD 8.3 TC), insert a new paragraph: If the dst field is specified and the rule field is not, it is implementation-defined when the changes to and from the alternative time occur. On page 3539 after line 12001 (XRAT A.8.3 TC), insert a new paragraph: Implementations are encouraged to use the time zone database maintained by IANA to determine when daylight savings time changes occur and to handle TZ values that start with a <colon>. See RFC 6557. |
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Interpretation proposed: 15 Dec 2016 |
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Interpretation Approved: 18 Jan 2017 |
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Applied but with editorial wording differences in line with bug 0001253 |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2016-03-03 20:32 | Guy Harris | New Issue | |
| 2016-03-03 20:32 | Guy Harris | Name | => Guy Harris |
| 2016-03-03 20:32 | Guy Harris | Section | => Environment Variables (section 8) |
| 2016-03-03 20:32 | Guy Harris | Page Number | => Unknown (I don't have a printed or PDF version of the spec) |
| 2016-03-03 20:32 | Guy Harris | Line Number | => Unknown (I don't have a printed or PDF version of the spec) |
| 2016-03-03 20:56 | Don Cragun | Page Number | Unknown (I don't have a printed or PDF version of the spec) => 179-180 |
| 2016-03-03 20:56 | Don Cragun | Line Number | Unknown (I don't have a printed or PDF version of the spec) => 5756-5816 |
| 2016-03-03 20:56 | Don Cragun | Interp Status | => --- |
| 2016-12-08 17:30 | rhansen | Note Added: 0003511 | |
| 2016-12-08 17:34 | rhansen | Final Accepted Text | => see 0001030:0003511 |
| 2016-12-08 17:34 | rhansen | Status | New => Interpretation Required |
| 2016-12-08 17:34 | rhansen | Resolution | Open => Accepted As Marked |
| 2016-12-08 17:34 | rhansen | Tag Attached: tc3-2008 | |
| 2016-12-09 09:44 | geoffclare | Interp Status | --- => Pending |
| 2016-12-15 18:07 | ajosey | Interp Status | Pending => Proposed |
| 2016-12-15 18:07 | ajosey | Note Added: 0003514 | |
| 2017-01-18 15:21 | ajosey | Interp Status | Proposed => Approved |
| 2017-01-18 15:21 | ajosey | Note Added: 0003544 | |
| 2019-10-23 09:39 | geoffclare | Note Added: 0004627 | |
| 2019-10-23 09:39 | geoffclare | Status | Interpretation Required => Applied |
| 2019-10-23 09:39 | geoffclare | Relationship added | related to 0001253 |
| 2024-06-11 08:57 | agadmin | Status | Applied => Closed |
