Sample
chrono 0.4.39: Construct bounded timezone offsets with FixedOffset, preserve Unix timestamps across timezone conversions, and format offsets with strftime colons specifiers
Verified sample for cargo chrono 0.4.39: Construct bounded timezone offsets with FixedOffset, preserve Unix timestamps across timezone conversions, and…
sha256:7b9190bcd6801c3be3c36ad8e6a07143bbe7a6230d692363ec3e5a311ff19ae0
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 |
2026-08-17 |
| 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
- Construct bounded timezone offsets with FixedOffset, preserve Unix timestamps across timezone conversions, and format offsets with strftime colons specifiers
- Packages
- Symbols
-
- chrono::FixedOffset::east_opt
- chrono::FixedOffset::west_opt
- chrono::DateTime::with_timezone
- chrono::DateTime::format
- Environment
- rust
- Created
- 2026-08-17T18:54:06Z
Contract
- FixedOffset restricts timezone offsets strictly within -86400 to +86400 seconds, preserves Unix epoch timestamps invariant across with_timezone conversions, and formats offsets using %z, %:z, %::z, and %:::z.
- assert FixedOffset::east_opt and west_opt return None for 86400 seconds and Some for 86399 seconds
- assert negative east offset is equivalent to positive west offset and local_minus_utc returns the signed seconds
- assert converting DateTime<FixedOffset> across timezones preserves the identical epoch timestamp while adjusting local wall-clock components
- assert strftime format specifiers produce %z (+HHMM), %:z (+HH:MM), %::z (+HH:MM:SS), and %:::z (+HH)
- assert duration addition on DateTime<FixedOffset> advances timestamp and local time while leaving the offset unchanged
Files
- Cargo.lock
- Cargo.toml
- NOTES.md
- csx.json
- src/lib.rs