Where the label goes
On the breakdown sheet, script day sits in the header next to D/N and page count. On a strip, it's usually a small field near the scene number. A week of the shooting schedule might look like this:
| Shoot day | Sc. | Set | D/N | Script day | Pages |
|---|---|---|---|---|---|
| 6 | 42 | EXT. GAS STATION | N | N4 | 5/8 |
| 6 | 42A | INT. GAS STATION | N | N4 | 2/8 |
| 6 | 7 | INT. ROSIE'S DINER | D | D1 | 1 2/8 |
| 7 | 61 | INT./EXT. MAYA'S VOLVO | N | N4 | 3/8 |
| 7 | 90 | EXT. QUARRY ROAD | D | D5 | 2 1/8 |
Shoot day 6 moves from story night 4 back to story day 1. That's normal. The script day column is what tells the costume trailer to put Maya back in her waitress uniform (Change 1) after she spent the morning soaked in her rain jacket (Change 6). Without it, someone has to reread the script every morning.
How to number script days
The usual approach, done once for the whole script before scheduling:
- Start at D1 with the first scene. If the film opens at night, start at N1.
- Keep the same number while the story stays in the same day.
- When day turns to night without sleep, keep the number and switch the letter: D1 becomes N1.
- When characters wake up or the story jumps to a new day, add one: N1 to D2.
- For flashbacks or flash-forwards, use a separate series, like FB1 or "D1 (1994)".
- When the script gives no clue, make a call, note it, and ask the writer.
Script day numbering is really a story day chart turned into labels. The script supervisor builds the full timeline and often catches cases where the breakdown and the script disagree. Settle discrepancies in prep.
Who uses it
Costume uses it to count changes in the wardrobe breakdown. Hair and makeup use it for injury progression and hairstyles. Props use it for things that change over the story, like a ring that comes off after the divorce or a phone screen that cracks. The 1st AD uses it to spot days with many time jumps, since each jump can mean costume and makeup changes that eat into the shooting day.
Common confusion
People mix up script day, shoot day, and scene number. Scene 90 on script day D5 on shoot day 7 involves three different numbers, all printed near each other on the call sheet. The other mistake is leaving the field blank on the breakdown sheet because "it's obvious," which it isn't to a costumer reading one strip at 5 a.m.