Three conversions that quietly fail in production: cron schedules, SQL dialects, and time zones

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Many teams keep small conversion snippets nobody owns, and they only break at particular times of year or on particular database engines. A cron expression like 0 2 * * * is a local calendar rule, so during daylight saving transitions it can skip a run entirely or fire twice. Good cron tooling should resolve schedules against a real timezone and explicitly flag nonexistent or duplicated local times. SQL dialects also diverge in subtle ways, such as double quotes meaning string literals in MySQL but identifiers in PostgreSQL, so converters should refuse to guess rather than produce plausible but wrong output. The author's advice is to translate only what is provably equivalent and to list anything that could not be converted safely.

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