Creation Of Alert

Summary:-

Hi All,

I created one period let say for month of Jan 22 and after that I created one alert for Jan 22 period but in the End Date filed it shown me pop message "Enter a date on or after 14 dec 2022". So my question is what is the reason for this gap? Why we cannot set before period i.e 14 dec 2022. Let say if I want to select date(Let Say) for 10 Feb 2022 I am unable to select that period in my End Date field. Application cannot permit me.

I want to know the logic behind that?

Thanks in advance