22/10/2026
An extra hour in bed. But what about your building?
When the clocks go back on Sunday 25 October, most of us will appreciate the extra hour without giving it much thought.
But for BEMS, accurate timekeeping is about much more than changing the clock.
Even a one-hour discrepancy can affect building operation, energy performance and the reliability of the data used to make informed decisions.
➡️ Plant schedules – Heating, ventilation and lighting need to operate when they're supposed to, not an hour early or late.
➡️ Energy data – Accurate timestamps are essential for reliable monitoring, reporting and meaningful performance analysis.
➡️ Alarms and trend logs – Consistent timekeeping helps engineers investigate faults, identify patterns and get to the root of problems.
➡️ System integration – Controllers, supervisory systems and analytics platforms need to stay in sync.
Modern BEMS can manage daylight saving changes automatically, but only when systems are correctly configured and synchronised.
At andOr Systems, we believe proactive building management is about anticipating issues, not just responding when something goes wrong.
With the clocks changing this weekend, now's a good time to make sure your BEMS is ready.
🤔 Not sure how your system will handle the change?
📲 Get in touch with our team.
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