Inject DateTimeProvider with UTC methods and a fake clock for deterministic tests.
npx skills add https://github.com/senrecep/tsentials --skill tsentials-time
Please help me install this Agent Skill. Skill: tsentials-time Source: https://github.com/senrecep/tsentials/tree/main/.well-known/agent-skills/tsentials-time Command: npx skills add https://github.com/senrecep/tsentials --skill tsentials-time
It solves nondeterministic tests and inconsistent timestamps caused by using Date.now() or new Date() directly in production code.
In your service, inject SystemDateTimeProvider for production behavior and inject createFakeDateTimeProvider for deterministic tests.
High-intent search queries and answers about installing and using this skill.
To write deterministic tests, replace direct Date.now() calls with a DateTimeProvider interface. This injectable abstraction lets you control time in tests by using a fake clock to freeze or advance timestamps as needed.
Dependency injection fixes nondeterministic time behavior by replacing direct Date.now() calls with an injectable DateTimeProvider. You inject a SystemDateTimeProvider for production and a fake clock for controlled, predictable test scenarios.
Yes, you can freeze and advance UTC time for date-only comparisons using a fake clock. The DateTimeProvider exposes utcNow(), utcNowDate(), and utcNowMs() methods, while the test double supports advance(ms) and setTime(date).
The best way to abstract time for consistent UTC timestamps is implementing a DateTimeProvider interface. It provides utcNow(), utcNowDate(), and utcNowMs() methods to keep behavior time-zone safe and predictable across domain and service code.
You need to replace Date.now() and new Date() calls in domain and service code that requires consistent UTC timestamps. Inject the DateTimeProvider into these specific areas to enable deterministic testing with a fake clock.
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