[i18n-activity] `validFrom` and `validTo` fields specification of `dateTime` format (#1729)

aphillips has just created a new issue for https://github.com/w3c/i18n-activity:

== `validFrom` and `validTo` fields specification of `dateTime` format ==
## Proposed comment

Validity Period
https://www.w3.org/TR/vc-data-model-2.0/#validity-period

> validFrom
>    A [credential](https://www.w3.org/TR/vc-data-model-2.0/#dfn-credential) MUST have an validFrom [property](https://www.w3.org/TR/vc-data-model-2.0/#dfn-property). The value of the validFrom [property](https://www.w3.org/TR/vc-data-model-2.0/#dfn-property) MUST be a string value of an [[XMLSCHEMA11-2](https://www.w3.org/TR/xmlschema11-2/#dateTime)] combined date-time string representing the date and time the [credential](https://www.w3.org/TR/vc-data-model-2.0/#dfn-credential) becomes valid, which could be a date and time in the future. Note that this value represents the earliest point in time at which the information associated with the credentialSubject [property](https://www.w3.org/TR/vc-data-model-2.0/#dfn-property) becomes valid.

The text says a "combined date-time string", but this is not actually a type in XMLSchema 1.1. The type that is being referred to is `dateTime`.

A challenge of this data type is that it allows values both with (`2023-06-15T00:00:00Z` or `2023-06-15T00:00:00-08:00`) and without (`2023-06-15T00:00:00`) time zone offsets. Since `validFrom` and `validTo` need to be interpreted as timestamp values, the spec should probably require that values without zone offsets be treated as being in the UTC time zone.

I would suggest writing this as:

> validFrom
>    A [credential](https://www.w3.org/TR/vc-data-model-2.0/#dfn-credential) MUST have an validFrom [property](https://www.w3.org/TR/vc-data-model-2.0/#dfn-property). The value of the validFrom [property](https://www.w3.org/TR/vc-data-model-2.0/#dfn-property) MUST be a string value of an [[XMLSCHEMA11-2](https://www.w3.org/TR/xmlschema11-2/#dateTime)] dateTime string representing the date, time and timezone offset the [credential](https://www.w3.org/TR/vc-data-model-2.0/#dfn-credential) becomes valid, which could be a date and time in the future. Note that this value represents the earliest point in time at which the information associated with the credentialSubject [property](https://www.w3.org/TR/vc-data-model-2.0/#dfn-property) becomes valid. Values without a timezone offset MUST be treated as being in the UTC time zone.

(Note that the quotes/suggestions above are about `validFrom`: the same comments/edits apply to `validTo`)

## Instructions: 

This follows the process at https://w3c.github.io/i18n-activity/guidelines/review-instructions.html

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2. **Add one or more t:... labels. These should use ids from specdev establish a link to that doc.**

2. Set a label to identify the spec: this starts with s: followed by the spec's short name. If you are unable to do that, ask a W3C staff contact to help.

3. Ask the i18n WG to review your comment.

4. After discussion with the i18n WG, raise an issue in the repository of the WG that owns the spec. Use the text above these instructions as the starting point for that comment, but add any suggestions that arose from the i18n WG. In the other WG's repo, add an 'i18n-needs-resolution' label to the new issue. If you think any of the participants in layout requirements task force groups would be interested in following the discussion, add also the appropriate i18n-\*lreq label(s).

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8. Edit this issue to **REMOVE ALL THE INSTRUCTIONS & THE PROPOSED COMMENT**, ie. the line below that is '---' and all the text before it to the very start of the issue.

---


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Received on Friday, 16 June 2023 14:30:12 UTC