Instead of duplicating the service, you can define only one and add several tags on it:

```yml
services:
    ezpublish.fieldType.ezdatetime.parameterProvider:
        class: %ezpublish.fieldType.locale.parameterProvider.class%
        arguments: [@request, @ezpublish.locale.converter]
        tags:
            - {name: ezpublish.fieldType.parameterProvider, alias: ezdatetime}
            - {name: ezpublish.fieldType.parameterProvider, alias: ezdate}
            - {name: ezpublish.fieldType.parameterProvider, alias: eztime}
```