IT Teams Urged to Prepare Systems Before Leap Seconds Are Abolished After 2027

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The International Bureau of Weights and Measures announced on May 12, 2026, that leap seconds will be discontinued after 2027. The change would fix the offset between UTC and TAI at 37 seconds permanently, ending the occasional 23:59:60 moment. Systems that depend on leap-second flags, including GPS receivers, NTP and PTP servers, financial timestamping, and blockchain nodes, may face errors or inconsistencies if not updated. The article offers vulnerability listings, audit checklists, and scripts to help teams detect misconfigured time sources before the transition. Organizations are advised to complete these fixes well ahead of the first day without a leap second.

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