# BOUNCE openehr-implementers@openehr.org:    Non-member submission from \[Tim Cook \<timothywayne.cook@gmail.com\>\]

**URL:** https://discourse.openehr.org/t/bounce-openehr-implementers-openehr-org-non-member-submission-from-tim-cook-timothywayne-cook-gmail-com/15869
**Category:** Implementers (archive)
**Created:** [4 September 2006 20:59 UTC](https://discourse.openehr.org/t/bounce-openehr-implementers-openehr-org-non-member-submission-from-tim-cook-timothywayne-cook-gmail-com/15869 "2006-09-04T20:59:40Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![thomas.beale](https://discourse.openehr.org/user_avatar/discourse.openehr.org/thomas.beale/32/35_2.png) [@thomas.beale](https://discourse.openehr.org/u/thomas.beale)
#### Post date: [4 September 2006 20:59 UTC](https://discourse.openehr.org/t/bounce-openehr-implementers-openehr-org-non-member-submission-from-tim-cook-timothywayne-cook-gmail-com/15869/1 "2006-09-04T20:59:40Z")

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[Tim - you are bouncing at the moment - are you posting from the address you are currently subscribed under?]

> Hi Bert,
> 
> Could you tell me where you found that restriction? AFAIK any ISO8601 compliant format is allowed.
> 
> Thanks,  
> Tim
> 
> Bert Verhees wrote:  
> &nbsp;&nbsp;
> 
> > Hi,
> > 
> > As I read in the ADL document, the notation for dates has always dashes in between.  
> > Like yyyy-MM-dd
> > 
> > I wonder why this is, and if other date-notations will be permitted in the future. I ask this because HL7 often only allows this yyyyMMdd.  
> > &nbsp;&nbsp;&nbsp;&nbsp;

In ADL, you can write a date in any ISO8601 form, with or without dashes. In cADL there is additionally an ISO8601-like literal constraint form in which patterns like "yyyy-mm-??" are used to constrain kinds of dates, e.g. that example allows for dates with optional days. That syntax (using literal "ymdThms" letters) is not ISO8601 - it is something we invented based on ISO8601.

Hope this clarifies.

- thomas