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Issue created by Administrator@rootContributor5 of 6 checklist items completed5/6 checklist items

[BUG] PHP is unable to handle highly precise DateTime values

Created by: carmenquan

Bug Report Checklist

  • Have you provided a full/minimal spec to reproduce the issue?
  • Have you validated the input using an OpenAPI validator (example)?
  • Have you tested with the latest master to confirm the issue still exists?
  • Have you searched for related issues/PRs?
  • What's the actual output vs expected output?
  • [Optional] Sponsorship to speed up the bug fix or feature request (example)
Description

PHP is unable to handle highly precise DateTime Values. While this issue covered most cases, we have a few instances of DateTime which are not handled. (i.e. "2021-10-06T20:17:16.076372256Z")

Example:

print_r(strtotime("2021-10-06T20:17:16.076372256Z")); // => ""
print_r(strtotime("2021-10-06T20:17:16.07637225Z")); // =>  "1633551436"
openapi-generator version

5.3.0

OpenAPI declaration file content or url

Any API with a date-time type. Concrete: https://github.com/ory/kratos/blob/master/.schema/api.swagger.json

Generation Details
Steps to reproduce

Provide a highly precise datetime value Example:

print_r(strtotime("2021-10-06T20:17:16.076372256Z")); // => ""
print_r(strtotime("2021-10-06T20:17:16.07637225Z")); // =>  "1633551436"
Related issues/PRs

https://github.com/OpenAPITools/openapi-generator/pull/7943

Suggest a fix

Some options here for how to deal with highly precise DateTime values in PHP