Time database: Difference between revisions
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* represent former IDs of the zone due to spelling change for the reference location | * represent former IDs of the zone due to spelling change for the reference location | ||
* represent former IDs of the zone due to reference location change (Tel Aviv -> Jerusalem) | * represent former IDs of the zone due to reference location change (Tel Aviv -> Jerusalem) | ||
* represent IDs of former zones (Vaduz links to Zurich) | * represent IDs of former zones (Vaduz links to Zurich) | ||
|- | |||
| A sector ID only contains alphanumeric characters, not case sensitive. (Note: further restriction likely) | |||
| A zone ID can contain alphanumeric characters and /-._ | |||
|- | |- | ||
| New sectors are created only by splitting and deprecating old sectors, so a user can know if an assignment of an ID to an object needs a check for correctness. | | New sectors are created only by splitting and deprecating old sectors, so a user can know if an assignment of an ID to an object needs a check for correctness. |
Revision as of 2013-09-20T20:26:54
Mailing list
Desired features
Time keeping database (tkdb) | IANA time zone database (tzdb) |
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Exactly one term for one kind of object |
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Smallest geographic unit is named "sector" | Smallest geographic unit is named "zone" |
The sectors cover the whole surface of the earth | Some areas are not covered, e.g. the ISO 3166 country "Bouvet Island" |
Each sector has exactly one sector ID. | Some zones have multiple IDs via links. These links can
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A sector ID only contains alphanumeric characters, not case sensitive. (Note: further restriction likely) | A zone ID can contain alphanumeric characters and /-._ |
New sectors are created only by splitting and deprecating old sectors, so a user can know if an assignment of an ID to an object needs a check for correctness. |
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Relations between deprecated sectors and the sectors that have been created out of them are published. | No split history is explicitly published. |
Record all legal time |
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Provide time zone acronyms that are unique within each country and at any given point in time refer to only one offset from a base time | Uses EST and CST for time stamps of zones in Australia that use DST and those that do not. That means for a given point in time during summer the offset from UTC and therefore UTC itself cannot be derived from the local time representation. |
ISO 3166-1 alpha-3 codes for countries | ISO 3166-1 alpha-2 codes for countries. Some of the codes have been re-assigned, e.g. CS can refer to Czechoslovakia or Serbia and Montenegro. |