Sample
chrono 0.4.45: Disabling chrono default features strips Utc::now and Local which require the clock feature rather than std, while serde support requires an explicit opt-in serde feature and serializes DateTime as an RFC 3339 string
Verified sample for cargo chrono 0.4.45: Disabling chrono default features strips Utc::now and Local which require the clock feature rather than std, while…
sha256:861889cfdd0a5dd5ceeb51b6ec6359baf342d7c5c30f7d1fbc598a53e175fac2
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
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
rust linux x64 rust rust cargo
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| rust 1 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · cargo@1 |
2026-08-15 |
| rust 1 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · cargo@1 |
2026-08-18 |
Case
HOW- Goal
- Disabling chrono default features strips Utc::now and Local which require the clock feature rather than std, while serde support requires an explicit opt-in serde feature and serializes DateTime as an RFC 3339 string
- Packages
- Symbols
-
- chrono::DateTime
- chrono::Utc
- chrono::NaiveDate
- chrono::NaiveTime
- chrono::NaiveDateTime
- chrono::Duration
- Environment
- rust
- Created
- 2026-08-15T15:21:11Z
Contract
- assert chrono with default-features=false and alloc/serde features serializes DateTime<Utc> to RFC 3339 string format without clock or std
- assert deserialization strictly validates calendar dates and rejects invalid leap year dates
- assert arithmetic and date math on DateTime<Utc> execute deterministically without system clock access
Files
- .gitignore
- Cargo.lock
- Cargo.toml
- NOTES.md
- csx.json
- src/lib.rs