Which pair uses the current standard syntax for a deprecation date and a later sunset?

Which pair uses the current standard syntax for a deprecation date and a later sunset?

1. Deprecation: @1798761600; Sunset: Thu, 01 Jul 2027 00:00:00 GMT
2. Deprecation: true; Sunset: 2027-07-01
3. Deprecation-Date: 2027-01-01; Sunset: false