Use the original observation date and the intended publication date. A source is due the day after its stated validity window.
Source review / Research evidence owner
Evidence Shelf Life
Identify cited material older than its agreed useful life.
01 / Inputs
Working sheet
Edit any cell to recalculate. Use anonymous references. Data stays in this browser tab and clears when you reload.
| Reference | Observed | Publish date | Valid days | Row |
|---|
02 / Review
Decision sheet
| Source | Valid through | Decision | Overdue days |
|---|---|---|---|
| R12 | 2026-09-29 | Refresh | 33 |
| R15 | 2026-11-30 | In window | 0 |
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