Somewhere in the Balkans, 1995. A team of aid workers must solve an apparently simple problem in an almost completely pacified territory that has been devastated by a cruel war, but some of the local inhabitants, the retreating combatants, the UN forces, many cows and an absurd bureaucracy will not cease to put obstacles in their way.
Unfortunately the movie A Perfect Day is not yet available on HBO Max.
| Directing | Fernando León de Aranoa | Director |
| Writing | Paula Farias | Novel |
| Production | Fernando León de Aranoa | Producer |
| Production | Jaume Roures | Producer |
| Production | Camilla-Valentine Isola | Casting |
| Art | César Macarrón | Production Design |
| Art | César Macarrón | Art Direction |
| Camera | Álex Catalán | Director of Photography |
| Sound | Arnau Bataller | Original Music Composer |
| Writing | Fernando León de Aranoa | Screenplay |
| Writing | Diego Farias | Co-Writer |
| Production | Patricia de Muns | Executive Producer |
| Production | Javier Méndez | Executive Producer |
| Production | Luis Fernández Lago | Line Producer |
| Editing | Nacho Ruiz Capillas | Editor |
| Sound | Iván Marín | Sound |
| Sound | Daniel Peña | Sound |
| Sound | Alfonso Raposo | Sound |
| Costume & Make-Up | Fernando García | Costume Designer |
| Costume & Make-Up | Caitlin Acheson | Makeup Designer |
| Costume & Make-Up | Caitlin Acheson | Hair Designer |
| Costume & Make-Up | Agathe Dupuis | Makeup Designer |
| Costume & Make-Up | Agathe Dupuis | Hair Designer |
| Visual Effects | Ferrán Piquer | Visual Effects Supervisor |
| Visual Effects | Raúl Romanillos | Special Effects Supervisor |
| Production | Ana Parra | Production Manager |
| Directing | Antonio Ordóñez | First Assistant Director |
| Production | Timka Grahić | Casting |
| Camera | Fernando Marrero | Still Photographer |
