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clarify non normal cron - 6 fields with seconds 

normal cron does not know about seconds and has typicaly only 5 fields, this is seconds aware and has 6 fields. This may be confusing without further noticing it.
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viisauksena 2022-09-05 05:24:10 +02:00 committed by GitHub
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components/time.rst
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@ -57,7 +57,9 @@ This powerful automation can be used to run automations at specific intervals at
specific times of day. The syntax is a subset of the `crontab <https://crontab.guru/>`__ syntax.
There are two ways to specify time intervals: Either with using the ``seconds:``, ``minutes:``, ...
keys as seen below or using a cron expression like ``* /5 * * * *``.
keys as seen below or using a cron alike expression like ``* /5 * * * *``.
Be aware normal cron implementations does not know about seconds like this esphome implementation, therefore you got 6 fields (seconds,minutes,hours,dayofmonth,month,dayofweek).
Basically, the automation engine looks at your configured time schedule every second and
evaluates if the automation should run.