Yes, just look at the system message output, it will list the exact date, time, and device that turned night mode on or off if it is a local device, or if this is a multinode network it may show the source as NODE XX or something like that, meaning a remote networked system.
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Thanks for the response.
I can see where it tells you what time the system was switched into day or night mode looking at the history in system output message print.
However, we only have 1 node in the office and it is only telling me that 'node 1' was the source.