· 6 min read
What We Learned Running 10,000 Property-Based Tests Against a Calendar Engine
Property-based testing caught DST double-counting, leap year edge cases, and RRULE bugs that unit tests missed. Here's our proptest setup.
· 4 min read
How Temporal Cortex Handles DST Transitions (So Your Agent Doesn't Have To)
A 9am weekly standup crosses spring-forward. Here's what goes wrong with naive implementations and how deterministic tools get it right.
· 5 min read
LLM vs Truth Engine: 5 RRULE Expansions Side-by-Side
We ran 5 real-world RRULEs through frontier LLMs and the Truth Engine. The results show why calendar math needs computation, not prediction.
· 4 min read
Introducing the Truth Engine: Deterministic RRULE Expansion
Why we built a Rust-based RRULE expansion library with 9,000+ property-based tests — and why AI agents need it.