Building a story day chart
The script supervisor reads the script for time clues and writes out the timeline. A section of a timeline for a thriller might look like this:
| Story day | Time | Scenes | Clues in script | Notes |
|---|---|---|---|---|
| D1 | Friday, morning to afternoon | 1-8 | "end of her double shift" in 3 | diner scenes |
| N1 | Friday night | 9-22 | motel, Polaroid | |
| D2 | Saturday | 23-30 | "yesterday" in 24 refers to 3 | |
| (gap) | 1 week | "a week later" title card | Maya's bruise healed | |
| D3 | Saturday + 7 | 31-39 | new hair: bun gone | |
| N3 | same night | 40-41 | Kestrel Bar | |
| N4 | 2 a.m. onward | 42-64 | rain, "she hasn't slept" | treated as a new night |
| D5 | next day | 65-94 | crash in 90 |
Notice N4. The characters haven't slept, which would normally keep it on N3, but the script supervisor started a new night number at the 2 a.m. scenes because a big wardrobe and makeup change happens there (rain-soaked). Whatever rule you use, write it in the notes column so departments don't read the chart differently.
Also notice the gap. Unshown time matters as much as shown days: bruises heal, hair grows, seasons turn, and a character's apartment could look different after a week. The hair and makeup team needs that gap to plan injury progression.
From timeline to breakdown
The story day chart turns into the script day labels on each breakdown sheet and strip. It also drives the wardrobe breakdown, where changes are counted per character per story day, and the continuity log, which tracks what should match across each day.
On set, the script supervisor tracks story days in the continuity report and flags when the schedule jumps between days in the middle of a shoot day, so hair and wardrobe get time to reset.
Mistakes
Guessing at gaps and never writing the guess down is the biggest one. Costume assumes two days pass, makeup assumes a week, and the edit ends up with a character whose black eye vanishes overnight. Another is ignoring flashbacks: a scene from 1994 needs its own story day series and its own looks, and it can easily get lumped into the present-day count. And once a revision adds or moves a scene, the chart needs updating. A new A-scene set "the next morning" can shift every story day after it.
For how the timeline protects matching on set, see continuity.