Using rules for updating item with last update time of several sensors

[hafniumzinc (T)]

For info, you can store the last update time in an Item directly (no rules required) using Profiles. See this post for details:

Design Pattern: Time of Last Update

Please see Design Pattern: What is a Design Pattern and How Do I Use Them for a description of what Design Patterns are and how to use them. Problem Statement Sometimes you want to know the latest time when an item has been updated. For example, when was the last time the front door was opened, or when was the last temperature reading from your fridge. It’s very useful for battery powered devices to check that they still are alive. Concept By using the new profile functionality for items (in …

Potentially not worth it in this case, because you need a rule for other things anyway, but just nice to know!