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    Timezone Boundary Test Builder

    by Mariusz Wrzeszczynski

    1

    Build timezone and date-boundary tests in a repo using Cursor.

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    Works with the AI tools you already use

    CClaude CodeCCursorCCodex CLIGGitHub CopilotGGemini CLIVVS CodeWWindsurfMManus+14 more

    See it in action

    You say

    Our trial expiry logic is off by one day for Australian users. Inspect our billing helper and add a test case for this boundary.

    Your agent does

    Found off-by-one risk in calcExpiry(). The logic uses local midnight instead of UTC. Proposing patch for billing.ts and added Australian/Sydney DST boundary test in billing.test.ts. Run npm test to verify.

    What you get

    Identify DST and off-by-one date bugsGenerate boundary tests for billing cyclesAudit UTC and local time conversionsVerify cron schedules and report ranges

    About this skill

    Build timezone and date-boundary tests in a repo using Cursor. This skill inspects date parsing, UTC/local conversions, database filters, cron schedules, billing periods, expiry logic, reports, UI formatting, and existing tests; flags DST, off-by-one, locale, naive-date, and midnight bugs; then prepares safe test cases, small patches, and verification steps without changing production clocks or data.

    How to install

    Drop the file into your AI Agent. Works with Claude, Cursor, ChatGPT, and 20+ more.

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    Creator

    Mariusz Wrzeszczynski
    Mariusz Wrzeszczynski

    159 skills on Agensi

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