How to Build Timezone-Aware Reminder Queues Without Silent Delivery Failures

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A technical guide published on DEV Community outlines a robust approach to scheduling user reminders in Node.js for services spanning multiple time zones, such as US and EU edtech platforms. The core recommendation is to store schedules using IANA timezone identifiers and local clock times, while persisting the next due instant in UTC for reliable querying. The article warns against naively adding fixed intervals to previous UTC timestamps, which breaks during Daylight Saving Time transitions that can skip or duplicate local times. To prevent delivery backlogs, the guide proposes a state model using durable per-reminder cursors, unique occurrence IDs, and bounded worker claim sizes to keep lateness visible and auditable. Code examples in Go illustrate the calendar boundary logic, with the author noting the same contract applies to Node.js using any compatible time library.

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ProgrammingDEV Community ·

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