Real context moved -17.5pp on Date-Arithmetic Error.
Better than the control, worse than nothing
The figure above is measured against the irrelevant-document control. Against no context at all this card is worse: 13% bare against 18% with the best supplied source. What the source repaired is damage the presence of a document did.
~intervals overlap — not separated from no change
Given an injected "current date," the model computes relative dates/intervals incorrectly. The rule
Today is 2026-01-30. What date is 30 days from today? Answer with the full date.
To find the date 30 days from today (2026-01-30), we'll add 30 days to the current date. 1. **Current Date:** 2026-01-30 2. **Days in January 2026:** 31 (since 2026 is not a leap year) 3. **Days Remaining in January:** 31 - 30 = 1 day 4. **Days to Add to February:** 30 - 1 = 29 days Now, add 29 days to February 1, 2026: - **February 2026 has 28 days** (not a leap year). - 29 days into February would land on **March 1, 2026** (since 28 + 1 = 29, and the next day is March 1). **Final Answer:** \boxed{2026-03-01}
detector fmi_7_3_v1: date arithmetic correct
To determine the date 30 days from today (2026-01-30), we can add 30 days to the current date. 1. **Current Date:** 2026-01-30 2. **Days in January 2026:** 31 (since 2026 is not a leap year, January has 31 days). 3. **Days remaining in January after today:** 31 - 30 = 1 day (January 31). 4. **Days to add after January 31:** 30 - 1 = 29 days. 5. **February 2026 has 28 days (not a leap year).** - Adding 28 days to January 31 brings us to February 28. - Remaining days to add: 29 - 28 = 1 day. 6. **Adding 1 day to February 28 brings us to March 1, 2026.** Thus, 30 days from 2026-01-30 is **2026-03-01**.
detector fmi_7_3_v1: date arithmetic correct
loop 2026-08-15 · mistralai/mistral-small-3.2-24b-instruct as served · open weights · released 2025-06 · 24B · set s1.3-live · cases v1.6 · conditions v1.0 · ground truth as of 2026-08-09
Today is 2026-01-30. What date is 30 days from today? Answer with the full date.
expected as of 2026-08-09
From 2026-01-30, 30 days later is 2026-03-01 (1 March 2026). Crossing February in a non-leap year.
Nothing supplied. The baseline.
To find the date 30 days from today (2026-01-30), we'll add 30 days to the current date. 1. **Current Date:** 2026-01-30 2. **Days in January 2026:** 31 (since 2026 is not a leap year) 3. **Days Remaining in January:** 31 - 30 = 1 day 4. **Days to Add to February:** 30 - 1 = 29 days Now, add 29 days to February 1, 2026: - **February 2026 has 28 days** (not a leap year). - 29 days into February would land on **March 1, 2026** (since 28 + 1 = 29, and the next day is March 1). **Final Answer:** \boxed{2026-03-01}
fmi_7_3_v1
detector fmi_7_3_v1: date arithmetic correct
0–60% · whisker = 95% interval
never pooled · a trap ratio would skew the delta
Supplying context did not reduce this failure, it increased it: 13% with no context against 23% under the strongest supplied source. What survives is therefore not a remainder but a substitution — the failures under context are 7 probes the detector still rejected, dominated by: expected 2026-04-09.
- date libraries via tools
- explicit date arithmetic
fmi_7_3_v1 · 5 repeats per case · best context curated context · rollups + residuals committed · probe log outside git · manifest hash ties them · method