Page 1 of Car Insurance question

Why do you no longer get a years cover when buying on-line?

I noticed my daughters car insurance was 5 days short of a year.
I renewed my van insurance with another company, and it is 18 days short of a year.

Is this something new, by not getting a full year? 
Is it to do with the nearest month, as the start date for my daughter was the 20th. and mine was the 17th. Even that does not make sense. But they are diddling us out of a full year.

it should be a year exactly, normally it states very clearly the start date and time of being date 00:00 and then ending a year later 23:59. you'll need to ask them, it must have said when you bought it

https://admars32.wordpress.com/

https://mobro.co/admars?mc=1

Yeh, I will get on to my insurance as i only just took it out a few days ago, but my daughters was a couple of months ago, so a bit late to argue.

I just do not understand why this is so, but will find out this week.