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Midnight bug in scheduled jobs causes data errors due to timezone confusion

By PulseAugur Editorial · [1 sources] ·

A common bug in scheduled jobs arises from the discrepancy between server time (often UTC) and user-perceived local time, particularly around midnight. This issue can cause jobs intended for one day to execute on another, leading to incorrect data reporting or processing. The problem is exacerbated by Daylight Saving Time shifts, which can silently alter job execution times by an hour. Developers are advised to explicitly define business days using IANA timezone strings rather than UTC offsets and to calculate reporting windows in the business timezone before converting to UTC for database queries. AI

IMPACT Developers should ensure scheduled jobs correctly handle timezones to prevent data errors and ensure accurate reporting.

RANK_REASON Article discusses a common bug in software development related to timezones and scheduling, offering a solution.

Read on dev.to — Claude Code tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Midnight bug in scheduled jobs causes data errors due to timezone confusion

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Article discusses a common bug in software development related to timezones and scheduling, offering a solution.
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COVERAGE [1]

  1. dev.to — Claude Code tag TIER_1 English(EN) · RAXXO Studios ·

    Scheduled Jobs and Time Zones: The Midnight Bug I Keep Seeing

    <ul> <li><p>Cron runs in UTC by default, so a "midnight" job can fire on the wrong local day</p></li> <li><p>Define the business day explicitly with a timezone string, never a UTC offset</p></li> <li><p>DST shifts your offset twice a year, which silently moves job times by an hou…

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