Sample
date-fns 4.4.0: Calculate business day spans across weekend boundaries, advance or decrement business days, and list interval weekends with date-fns
Verified sample for npm date-fns 4.4.0: Calculate business day spans across weekend boundaries, advance or decrement business days, and list interval…
sha256:f8f6ad085cc31fc09fc8715073c9fd615e0f0205060ae9033fec3d8ba026dc3a
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MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
node linux x64 node node npm
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| node 22 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1 |
2026-08-17 |
| node 22 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1 |
2026-08-18 |
Case
HOW- Goal
- Calculate business day spans across weekend boundaries, advance or decrement business days, and list interval weekends with date-fns
- Packages
- Symbols
-
- differenceInBusinessDays
- addBusinessDays
- subBusinessDays
- isWeekend
- eachWeekendOfInterval
- Environment
- node
- Created
- 2026-08-17T18:06:54Z
Contract
- differenceInBusinessDays from Saturday or Sunday to Monday returns 0 because no full business day elapsed, whereas Friday to Saturday returns 1
- differenceInBusinessDays from Friday to Monday returns 1 business day, skipping the intervening weekend
- differenceInBusinessDays preserves signed negative values when earlier date is compared to later date
- addBusinessDays on Saturday with amount 0 preserves the Saturday date instead of advancing to Monday
- addBusinessDays advances weekend dates to Monday for positive amounts and subBusinessDays decrements to Friday for negative steps
- isWeekend identifies Saturday and Sunday while returning false for Monday through Friday
- eachWeekendOfInterval returns descending weekend dates for inverted intervals without throwing RangeError
Files
- NOTES.md
- csx.json
- package-lock.json
- package.json
- src/index.mjs
- test/contract.mjs