Resolving what the script actually says
Scene headings are inconsistent about time. Here's a run of five scenes and how they'd be entered:
| Sc. | Heading as written | D/N entered | Reason |
|---|---|---|---|
| 33 | EXT. RIVER ROAD - DUSK | Dusk | short window, flagged |
| 34 | INT. HENDERSON HOUSE - FOYER - NIGHT | N | as written |
| 35 | INT. HENDERSON HOUSE - STAIRWAY - CONTINUOUS | N | continues 34 |
| 36 | EXT. HENDERSON HOUSE - LATER | N | action has porch light on, headlights |
| 37 | INT. SHERIFF'S OFFICE - MORNING | D | morning is day |
Scene 36 is the one that catches people. LATER could mean an hour or a day, and only the action lines tell you. When the text doesn't settle it, ask the writer or director and write the answer in the notes.
Why it matters so much for scheduling
Night exteriors are expensive and slow. They need lighting packages, generators, and condors, and they wreck the crew's sleep. The 1st AD groups them into night weeks and plans the flip back to days, because turnaround rules make it hard to go from a night wrap to a morning call. D/N also sets strip color on the stripboard along with INT./EXT..
Dusk and dawn scenes get special treatment. Usable dusk light often lasts well under an hour, depending on latitude and season, so anything beyond a short scene may take more than one evening at that light. Use a sunrise and sunset planner to see the actual window at your location and date.
Day/night in the story timeline
D/N also matters for continuity. The script supervisor combines it with the sequence of scenes to count story days: D1, N1, D2, and so on. A day scene after a night scene usually starts a new story day, which usually means new wardrobe. Getting a single scene's D/N wrong can shift every story day that follows.
Common mistakes
Tagging by the last word in the heading and ignoring the action is the usual one. Another is treating INT. NIGHT as easy. An interior night scene with windows on location still has to be shot after dark or with the windows blacked out, and those two options cost very different amounts. Note which one you're planning on the breakdown sheet. If you're considering shooting day for night, put that in the notes too, since camera, grading, and the director of photography all have to agree to it.
