Store time to an item when presence was detected

[MikeH]

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Set last tripped/alarm date, or last action date to an item - best practice?

Hi together, maybe this is a ridiculous question, but I have some contacts and motion sensors installed and I’m thinking about the best practice for setting the last “alarm” date to an Item. I found this topic, what is describing how to update the last value to an Item, but does not provide the rule trigger or something similar: How to assign lastUpdate to an item? What do you think is the best practice to set the last update? rule with time cron every xx minute? rule for each sensor/contac…