OK, It works best if you go into
Blueiris settings/schedule and the create a new schedule Day_Night. You can call it whatever you want but do it here and save it. Then you can use that saved schedule for each camera. For example:
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Creating the schedule takes some patience as it is a learning process. First click on the days box and get all the days selected. The use the sliders, and click the slider icon and then check the box relative to sunrise/sunset. You can then adjust the minutes, like mine I set to 10minutes before sunrise and 10 minute after sunset.
Once you have this set click OK to save it. Keep in mind you must have the global schedule ENABLED just to create and save. Once you have that done, go back in and disable the global schedule. BUT, you can still be able to select your saved schedule on any camera now. See example:
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Now when you select "Events Schedule" you will see where you add a "Action set 1" I used this for day mode. Then you edit the action set and add the "configure web request" for each of your cameras.
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Now you can do this for each cam within the cam, or in my case I just used one camera to change all of mine, depends on your use.
BE SURE you have your Blueiris settings location set correctly so it will change as the sunrise/sunset times change. The times will change and BI will change the times for you, once this is set, you can forget about it