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I'm using Sitecore 9.3, I have a custom scheduled task for rebuilding the Sitecore search index at night.
My project is hosted on Azure environment, I noticed that if I restart the CM app service then the task gets triggered and rebuilds the index as a result.
I don't want that, I tried to reproduce the issue on my machine, but it didn't happen.
Schedule time is:
20210803T235900||127|23:59:00
Sitecore's built-in Tasks -> Schedulers functionality works well when you need to execute a task occasionally, but it becomes problematic if you require to run some routine at a certain time every day.
You can schedule a task to run every 24 hours, but you cannot ensure that it will run at exact the same time every day because of the interval-based nature of the scheduled execution.
Task schedule in Sitecore is based on the interval execution, not on the absolute time. Sitecore periodically performs a check for any tasks that are due to run. Time between checking for scheduled tasks waiting to execute is defined in Sitecore config file, see scheduling -> frequency setting.
Therefore, it is almost impossible to schedule a task to execute at the specific hour and minute of a day.
portal.azure.com? I cannot think of any reason. More probable is that the job schedule item is synchronized and "Last Run" field is either cleared or set to an old date.