I needed those for doing some illuminance calcs, so I made a quick device driver to calculate those every day at midnight. It uses Calendar for Day of Year, but I used an algorithm for Week of Year from the internet.
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Also available with [RELEASE] Date Time Parser driver (aka schedule_ur_garbage_cans)
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Good to know that is out there, but that is really overkill for what I needed. I probably would have used that if I knew it existed, but better to just calc what I need.
I think that Time Date Parser would be better with preferences for what to calculate based on need.
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